Factors controlling the reservoir accumulation of Triassic Chang 6 Member in Jiyuan-Wuqi area,Ordos Basin,NW China
|
摘要
In the Triassic Yanchang Formation, Jiyuan-Wuqi area, Ordos Basin, the Chang 6 reservoir is contacted to the Chang 7 high-quality source rock, but the oil pools are unevenly distributed, and complex in oil and water distribution. Through cores observation and fracture statistics, combined with comprehensive analyses of physical property, mercury injection, logging and geochemical data, and comparisons of the sandbodies scales, reservoir physical properties, argillaceous laminae and fractures between source and reservoir in the eastern and western oil-bearing areas and in the central water producing area, it is found that the hydrocarbon accumulation patterns are different in the eastern, central and western areas, and the characteristics of hydrocarbon migration under the background of double-provenance were sorted out. The study results show that the crude oil in the eastern area has different Pr/Ph and sterane distribution from that in the western area. The oil and gas primarily migrated vertically. The high-quality source rocks and favorable source-reservoir-cap combinations lay the foundation for large-scale oil and gas accumulations. Vertically, the oil and gas enrichment is controlled by the scale of sandbody and the difference of physical properties, while on the plane, it is controlled by the connectivity of sandbodies, the argillaceous laminae between source rock and reservoir, the reservoir physical property and the fractures. The sandbodies of oil-rich zones in the eastern and western areas have large thickness, low shale content, good physical properties, weak heterogeneity, few argillaceous laminae and abundant fractures, all of which are favorable for the vertical migration and accumulation of oil and gas. In contrast, in the middle area with converging provenances, the reservoirs, composed of thin sandbodies, features rapid variation in lithology and physical properties, strong heterogeneity, poor continuity of sandbodies, abundant argillaceous laminae between source rock and reservoir, and few fractures, makes it difficult for the oil and gas to migrate vertically, and results in low oil enrichment degree ultimately. For the exploration of continental multiple-provenance tight reservoirs, not only the good-property source rocks and reservoirs, but more importantly the source-reservoir contact relationship and the effect of fractures on the hydrocarbon migration and accumulation should be considered.
In the Triassic Yanchang Formation, Jiyuan-Wuqi area, Ordos Basin, the Chang 6 reservoir is contacted to the Chang 7 high-quality source rock, but the oil pools are unevenly distributed, and complex in oil and water distribution. Through cores observation and fracture statistics, combined with comprehensive analyses of physical property, mercury injection, logging and geochemical data, and comparisons of the sandbodies scales, reservoir physical properties, argillaceous laminae and fractures between source and reservoir in the eastern and western oil-bearing areas and in the central water producing area, it is found that the hydrocarbon accumulation patterns are different in the eastern, central and western areas, and the characteristics of hydrocarbon migration under the background of double-provenance were sorted out. The study results show that the crude oil in the eastern area has different Pr/Ph and sterane distribution from that in the western area. The oil and gas primarily migrated vertically. The high-quality source rocks and favorable source-reservoir-cap combinations lay the foundation for large-scale oil and gas accumulations. Vertically, the oil and gas enrichment is controlled by the scale of sandbody and the difference of physical properties, while on the plane, it is controlled by the connectivity of sandbodies, the argillaceous laminae between source rock and reservoir, the reservoir physical property and the fractures. The sandbodies of oil-rich zones in the eastern and western areas have large thickness, low shale content, good physical properties, weak heterogeneity, few argillaceous laminae and abundant fractures, all of which are favorable for the vertical migration and accumulation of oil and gas. In contrast, in the middle area with converging provenances, the reservoirs, composed of thin sandbodies, features rapid variation in lithology and physical properties, strong heterogeneity, poor continuity of sandbodies, abundant argillaceous laminae between source rock and reservoir, and few fractures, makes it difficult for the oil and gas to migrate vertically, and results in low oil enrichment degree ultimately. For the exploration of continental multiple-provenance tight reservoirs, not only the good-property source rocks and reservoirs, but more importantly the source-reservoir contact relationship and the effect of fractures on the hydrocarbon migration and accumulation should be considered.
In the Triassic Yanchang Formation, Jiyuan-Wuqi area, Ordos Basin, the Chang 6 reservoir is contacted to the Chang 7 high-quality source rock, but the oil pools are unevenly distributed, and complex in oil and water distribution. Through cores observation and fracture statistics, combined with comprehensive analyses of physical property, mercury injection, logging and geochemical data, and comparisons of the sandbodies scales, reservoir physical properties, argillaceous laminae and fractures between source and reservoir in the eastern and western oil-bearing areas and in the central water producing area, it is found that the hydrocarbon accumulation patterns are different in the eastern, central and western areas, and the characteristics of hydrocarbon migration under the background of double-provenance were sorted out. The study results show that the crude oil in the eastern area has different Pr/Ph and sterane distribution from that in the western area. The oil and gas primarily migrated vertically. The high-quality source rocks and favorable source-reservoir-cap combinations lay the foundation for large-scale oil and gas accumulations. Vertically, the oil and gas enrichment is controlled by the scale of sandbody and the difference of physical properties, while on the plane, it is controlled by the connectivity of sandbodies, the argillaceous laminae between source rock and reservoir, the reservoir physical property and the fractures. The sandbodies of oil-rich zones in the eastern and western areas have large thickness, low shale content, good physical properties, weak heterogeneity, few argillaceous laminae and abundant fractures, all of which are favorable for the vertical migration and accumulation of oil and gas. In contrast, in the middle area with converging provenances, the reservoirs, composed of thin sandbodies, features rapid variation in lithology and physical properties, strong heterogeneity, poor continuity of sandbodies, abundant argillaceous laminae between source rock and reservoir, and few fractures, makes it difficult for the oil and gas to migrate vertically, and results in low oil enrichment degree ultimately. For the exploration of continental multiple-provenance tight reservoirs, not only the good-property source rocks and reservoirs, but more importantly the source-reservoir contact relationship and the effect of fractures on the hydrocarbon migration and accumulation should be considered.
引文
[1]ZOU Caineng,TAO Shizhen,HOU Lianhua,et al.Unconventional petroleum geology.2nd ed.Beijing:Geological Publishing House,2013.
[2]ZOU Caineng,ZHANG Guosheng,YANG Zhi,et al.Geological concepts,characteristics,resource potential and key techniques of unconventional hydrocarbon:On unconventional petroleum geology.Petroleum Exploration and Development,2013,40(4):385-399,454.
[3]YANG Hua,LI Shixiang,LIU Xianyang.Characteristics and resource prospects of tight oil and shale oil in Ordos Basin.Acta Petrolei Sinica,2013,34(1):1-11.
[4]REN Zhanli,LI Wenhou,LIANG Yu,et al.Tight oil reservoir formation conditions and main controlling factors of Yanchang Formation in southeastern Ordos Basin.Oil&Gas Geology,2014,35(2):190-198.
[5]YAO Jingli,ZHAO Yande,DENG Xiuqin,et al.Controlling factors of tight oil reservoir in Triassic Yanchang Formation in Ordos Basin.Journal of Jilin University(Earth Science Edition),2015,45(4):983-992.
[6]LUO Xiaorong,WANG Zhongnan,LEI Yuhong,et al.Heterogeneity characteristics and accumulation model of ultra-low permeability sandstone reservoirs:A case study of the lower part of Yanchang Formation in the western Ordos Basin,China.Acta Petrolei Sinica,2016,37(S1):87-98.
[7]BAI Yubin,ZHAO Jingzhou,FANG Chaoqiang,et al.Forming mechanism of quasi-continuous tight sandstone reservoir of Chang 6 oil-bearing formation,Ordos Basin.Petroleum Geology&Experiment,2013,35(1):65-71.
[8]YAO Jingli,DENG Xiuqin,ZHAO Yande,et al.Characteristics of tight oil in Triassic Yanchang Formation,Ordos Basin.Petroleum Exploration and Development,2013,40(2):150-158.
[9]CHEN Shijia,LU Jungang,YAO Jingli,et al.Characteristics of reservoir formation and the controlling factors of Chang 8oil-bearing formation in Huaqing area of Ordos Basin.Acta Sedimentologica Sinica,2012,30(6):1130-1139.
[10]WANG Feng,TIAN Jingchun,ZHANG Jinquan,et al.Source analysis and favorable reservoir distribution of Chang6 Formation in Jiyuan-Hujianshan area.Natural Gas Geoscience,2006,17(6):783-788.
[11]WANG Changyong,ZHENG Rongcai,WANG Haihong,et al.Provenance analysis of Chang-6 oil reservoir set in Jiyuan region in Ordos Basin.Acta Sedimentologica Sinica,2008,26(6):933-938.
[12]WANG Jianmin,WANG Jiayuan.Low-amplitude structures and oil-gas enrichment on the Yishaan Slope,Ordos Basin.Petroleum Exploration and Development,2013,40(1):49-57.
[13]ZHONG Zhangqi,JIAO Tao,LI Junjian,et al.Main control factors and accumulation model in Yanchang Formation of Jiyuan region,Ordos Basin.Petroleum Geology&Engineering,2016,30(3):28-31.
[14]MA Yanli,LI Cheng,DAN Weidong,et al.Analysis on main control factors of Chang-6 reservoir in Jiyuan region,Ordos Basin.Petroleum Geology&Engineering,2016,30(3):32-37.
[15]ZOU Caineng,TAO Shizhen,YUAN Xuanjun,et al.Global importance of“continuous”petroleum reservoirs:Accumulation,distribution and evaluation.Petroleum Exploration and Development,2009,36(6):669-682.
[16]ZHAO Jingzhou,LI Jun,CAO Qing,et al.Hydrocarbon accumulation patterns of large tight oil and gas fields.Oil&Gas Geology,2013,34(5):573-583.
[17]ZHAO Jingzhou,CAO Qing,BAI Yubin,et al.Petroleum accumulation from continuous to dis continuous:Concept,classification and distribution.Acta Petrolei Sinica,2016,37(2):145-159.
[18]YANG Hua,FU Jinhua,HE Haiqing,et al.Formation and distribution of large low-permeability lithologic oil regions in Huaqing,Ordos Basin.Petroleum Exploration and Development,2012,39(6):641-648.
[19]DENG Xiuqin,FU Jinhua,YAO Jingli,et al.Sedimentary facies of the Middle-Upper Triassic Yanchang Formation in Ordos Basin and breakthrough in petroleum exploration.Journal of Palaeogeography,2011,13(4):443-455.
[20]YANG Hua,LIANG Xiaowei,NIU Xiaobing,et al.Geological conditions for continental tight oil formation and the main controlling factors for the enrichment:A case of Chang 7Member,Triassic Yanchang Formation,Ordos Basin,NWChina.Petroleum Exploration and Development,2017,44(1):12-20.
[21]LIU Jun,LUO Shunshe,TIAN Qinghua,et al.Sedimentary facies of the Chang-6 oil reservoirs in the Dingbian-Wuqi region,Ordos Basin.Sedimentary Geology and Tethyan Geology,2013,33(1):42-48.
[22]REN Dazhong,SUN Wei,HUANG Hai,et al.Formation mechanism of Chang 6 tight sandstone reservoir in Jiyuan oil field,Ordos Basin.Earth Science,2016,41(10):1735-1744.
[23]GONG Fanhao,BAO Zhidong,LIU Li,et al.Sedimentary microfacies characters of Chang 6 oil-bearing formation in Jiyuan area of Ordos Basin.Global Geology,2010,29(4):614-621.
[24]WANG Hongbo,LI Xiangbo,LIAO Jianbo.Origin of super-low permeability sand bodies of Chang 6 oil reservoir set in Huaqing area,Ordos Basin.Lithologic Reservoirs,2012,24(5):61-64.
[25]LUO Shunshe,LI Mengjie,LIU Jun,et al.Control over reservoir distribution by Chang-6 sandstone structure in Dingbian-Wuqi area.Special Oil&Gas Reservoirs,2015,22(2):8-12.
[26]YU Bo.Characteristics of Chang 7-Chang 9 reservoir group of Triassic in Wuqi and Dingbian area.Lithologic Reservoirs,2011,23(5):16-20.
[27]WANG Lan,LI Wenhou,LIN Tong,et al.Diagenesis and its influencing factors of the Chang 6 interval of Upper Triassic Yanchang Formation in Ordos Basin.Journal of Palaeogeography,2012,14(3):311-321.
[28]YAO Jingli,LI Yong,CHEN Shijia,et al.Reservoir characteristics of Chang 61 and its control on oil-bearing ability in Dingbian-Wuqi area,Ordos Basin.Lithologic Reservoirs,2018,30(4):56-64.
[29]LIU Zhenwei,ZHENG Xi,ZHONG Zhangqi,et al.Characteristics and formation mechanism of Chang 6 reservoir in Jiyuan area.Lithologic Reservoirs,2016,28(3):20-26.
[30]LI Cheng,DAN Weidong,YUAN Jingsu,et al.Controlling factors and hydrocarbon accumulation pattern of Chang 4+5oil reservoirs in the Jiyuan area,Ordos Basin.China Petroleum Exploration,2016,21(2):45-52.
[31]GUO Yanru,LIU Junbang,YANG Hua,et al.Hydrocarbon accumulation mechanism of low permeable tight lithologic oil reservoirs in the Yanchang Formation,Ordos Basin,China.Petroleum Exploration and Development,2012,39(4):417-425.
[32]CHEN Shijia.The main controlling factors on reservoir accumulation of Chang 6 in Dingbian-Wuqi area.Xi’an:Changing Oilfield Branch Company,2014.
[33]BROOKS J D,GOULD K,SMITH J W.Isoprenoid hydrocarbons in coal and petroleum.Nature,1969,222(5190):257-259.
[34]PETERS K E,WALTERS C C,MOLDOWAN J M.The biomarker guide.2nd ed.Cambridge:Cambridge University Press,2005.
[35]DIDYK B M,SIMONEIT B R T,BRASSELL S C,et al.Organic geochemical indicators of palaeo-environmental conditions of sedimentation.Nature,1978,272(5650):216-222.
[36]FU Jinhua,GAO Zhenzhong,NIU Xiaobing,et al.Sedimentary microfacies characteristics and new understandings of the Upper Triassic Yanchang Formation Chang 63 interval in Huanxian area in Ordos Basin.Journal of Palaeogeography,2012,14(6):695-706.
[37]DONG Junyan,CHEN Shijia,ZOU Xianli,et al.Distribution and origin of rearranged hopanes in Yanchang Formation,Wuqi-Gaoqiao area,Ordos Basin.Petroleum Geology&Experiment,2017,39(6):834-841.
[38]YU Jian,YANG Yajuan,DU Jinliang.Sedimentation during the transgression period in Late Triassic Yanchang Formation,Ordos Basin.Petroleum Exploration and Development,2010,37(2):181-187.
[39]BAI Yubin,ZHAO Jingzhou,FANG Chaoqiang,et al.Control effect of high-quality source rocks on petroleum accumulation in Yanchang Formation,Ordos Basin.Journal of Xi’an Shiyou University(Natural Science Edition),2012,27(2):1-5.
[40]ZHANG Wenzheng,YANG Hua,LI Jianfeng,et al.Leading effect of high-class source rock of Chang 7 in Ordos Basin on enrichment of low permeability oil-gas accumulation.Petroleum Exploration and Development,2006,33(3):289-293.
[41]ZOU Caineng,YANG Zhi,TAO Shizhen,et al.Nano-hydrocarbon and the accumulation in coexisting source and reservoir.Petroleum Exploration and Development,2012,39(1):13-26.
[42]LIAO Jianbo,LI Zhiyong,LONG Liwen,et al.The effect of provenance intersection on the petroleum enrichment:An example from chang-6 member in Huaqing Area of central Ordos Basin.Xinjiang Petroleum Geology,2013,34(1):20-23.
[43]CHEN Shijia,GAO Xingjun,WANG Li,et al.Factors controlling oiliness of Jurassic Lianggaoshan tight sands in central Sichuan Basin,SW China.Petroleum Exploration and Development,2014,41(4):421-427.
[44]ZENG Lianbo,LI Zhongxing,SHI Cheng’en,et al.Characteristics and origin of fractures in the extra low-permeability sandstone reservoirs of the Upper Triassic Yanchang Formation in the Ordos Basin.Acta Geologica Sinica,2007,81(2):174-180.
[2]ZOU Caineng,ZHANG Guosheng,YANG Zhi,et al.Geological concepts,characteristics,resource potential and key techniques of unconventional hydrocarbon:On unconventional petroleum geology.Petroleum Exploration and Development,2013,40(4):385-399,454.
[3]YANG Hua,LI Shixiang,LIU Xianyang.Characteristics and resource prospects of tight oil and shale oil in Ordos Basin.Acta Petrolei Sinica,2013,34(1):1-11.
[4]REN Zhanli,LI Wenhou,LIANG Yu,et al.Tight oil reservoir formation conditions and main controlling factors of Yanchang Formation in southeastern Ordos Basin.Oil&Gas Geology,2014,35(2):190-198.
[5]YAO Jingli,ZHAO Yande,DENG Xiuqin,et al.Controlling factors of tight oil reservoir in Triassic Yanchang Formation in Ordos Basin.Journal of Jilin University(Earth Science Edition),2015,45(4):983-992.
[6]LUO Xiaorong,WANG Zhongnan,LEI Yuhong,et al.Heterogeneity characteristics and accumulation model of ultra-low permeability sandstone reservoirs:A case study of the lower part of Yanchang Formation in the western Ordos Basin,China.Acta Petrolei Sinica,2016,37(S1):87-98.
[7]BAI Yubin,ZHAO Jingzhou,FANG Chaoqiang,et al.Forming mechanism of quasi-continuous tight sandstone reservoir of Chang 6 oil-bearing formation,Ordos Basin.Petroleum Geology&Experiment,2013,35(1):65-71.
[8]YAO Jingli,DENG Xiuqin,ZHAO Yande,et al.Characteristics of tight oil in Triassic Yanchang Formation,Ordos Basin.Petroleum Exploration and Development,2013,40(2):150-158.
[9]CHEN Shijia,LU Jungang,YAO Jingli,et al.Characteristics of reservoir formation and the controlling factors of Chang 8oil-bearing formation in Huaqing area of Ordos Basin.Acta Sedimentologica Sinica,2012,30(6):1130-1139.
[10]WANG Feng,TIAN Jingchun,ZHANG Jinquan,et al.Source analysis and favorable reservoir distribution of Chang6 Formation in Jiyuan-Hujianshan area.Natural Gas Geoscience,2006,17(6):783-788.
[11]WANG Changyong,ZHENG Rongcai,WANG Haihong,et al.Provenance analysis of Chang-6 oil reservoir set in Jiyuan region in Ordos Basin.Acta Sedimentologica Sinica,2008,26(6):933-938.
[12]WANG Jianmin,WANG Jiayuan.Low-amplitude structures and oil-gas enrichment on the Yishaan Slope,Ordos Basin.Petroleum Exploration and Development,2013,40(1):49-57.
[13]ZHONG Zhangqi,JIAO Tao,LI Junjian,et al.Main control factors and accumulation model in Yanchang Formation of Jiyuan region,Ordos Basin.Petroleum Geology&Engineering,2016,30(3):28-31.
[14]MA Yanli,LI Cheng,DAN Weidong,et al.Analysis on main control factors of Chang-6 reservoir in Jiyuan region,Ordos Basin.Petroleum Geology&Engineering,2016,30(3):32-37.
[15]ZOU Caineng,TAO Shizhen,YUAN Xuanjun,et al.Global importance of“continuous”petroleum reservoirs:Accumulation,distribution and evaluation.Petroleum Exploration and Development,2009,36(6):669-682.
[16]ZHAO Jingzhou,LI Jun,CAO Qing,et al.Hydrocarbon accumulation patterns of large tight oil and gas fields.Oil&Gas Geology,2013,34(5):573-583.
[17]ZHAO Jingzhou,CAO Qing,BAI Yubin,et al.Petroleum accumulation from continuous to dis continuous:Concept,classification and distribution.Acta Petrolei Sinica,2016,37(2):145-159.
[18]YANG Hua,FU Jinhua,HE Haiqing,et al.Formation and distribution of large low-permeability lithologic oil regions in Huaqing,Ordos Basin.Petroleum Exploration and Development,2012,39(6):641-648.
[19]DENG Xiuqin,FU Jinhua,YAO Jingli,et al.Sedimentary facies of the Middle-Upper Triassic Yanchang Formation in Ordos Basin and breakthrough in petroleum exploration.Journal of Palaeogeography,2011,13(4):443-455.
[20]YANG Hua,LIANG Xiaowei,NIU Xiaobing,et al.Geological conditions for continental tight oil formation and the main controlling factors for the enrichment:A case of Chang 7Member,Triassic Yanchang Formation,Ordos Basin,NWChina.Petroleum Exploration and Development,2017,44(1):12-20.
[21]LIU Jun,LUO Shunshe,TIAN Qinghua,et al.Sedimentary facies of the Chang-6 oil reservoirs in the Dingbian-Wuqi region,Ordos Basin.Sedimentary Geology and Tethyan Geology,2013,33(1):42-48.
[22]REN Dazhong,SUN Wei,HUANG Hai,et al.Formation mechanism of Chang 6 tight sandstone reservoir in Jiyuan oil field,Ordos Basin.Earth Science,2016,41(10):1735-1744.
[23]GONG Fanhao,BAO Zhidong,LIU Li,et al.Sedimentary microfacies characters of Chang 6 oil-bearing formation in Jiyuan area of Ordos Basin.Global Geology,2010,29(4):614-621.
[24]WANG Hongbo,LI Xiangbo,LIAO Jianbo.Origin of super-low permeability sand bodies of Chang 6 oil reservoir set in Huaqing area,Ordos Basin.Lithologic Reservoirs,2012,24(5):61-64.
[25]LUO Shunshe,LI Mengjie,LIU Jun,et al.Control over reservoir distribution by Chang-6 sandstone structure in Dingbian-Wuqi area.Special Oil&Gas Reservoirs,2015,22(2):8-12.
[26]YU Bo.Characteristics of Chang 7-Chang 9 reservoir group of Triassic in Wuqi and Dingbian area.Lithologic Reservoirs,2011,23(5):16-20.
[27]WANG Lan,LI Wenhou,LIN Tong,et al.Diagenesis and its influencing factors of the Chang 6 interval of Upper Triassic Yanchang Formation in Ordos Basin.Journal of Palaeogeography,2012,14(3):311-321.
[28]YAO Jingli,LI Yong,CHEN Shijia,et al.Reservoir characteristics of Chang 61 and its control on oil-bearing ability in Dingbian-Wuqi area,Ordos Basin.Lithologic Reservoirs,2018,30(4):56-64.
[29]LIU Zhenwei,ZHENG Xi,ZHONG Zhangqi,et al.Characteristics and formation mechanism of Chang 6 reservoir in Jiyuan area.Lithologic Reservoirs,2016,28(3):20-26.
[30]LI Cheng,DAN Weidong,YUAN Jingsu,et al.Controlling factors and hydrocarbon accumulation pattern of Chang 4+5oil reservoirs in the Jiyuan area,Ordos Basin.China Petroleum Exploration,2016,21(2):45-52.
[31]GUO Yanru,LIU Junbang,YANG Hua,et al.Hydrocarbon accumulation mechanism of low permeable tight lithologic oil reservoirs in the Yanchang Formation,Ordos Basin,China.Petroleum Exploration and Development,2012,39(4):417-425.
[32]CHEN Shijia.The main controlling factors on reservoir accumulation of Chang 6 in Dingbian-Wuqi area.Xi’an:Changing Oilfield Branch Company,2014.
[33]BROOKS J D,GOULD K,SMITH J W.Isoprenoid hydrocarbons in coal and petroleum.Nature,1969,222(5190):257-259.
[34]PETERS K E,WALTERS C C,MOLDOWAN J M.The biomarker guide.2nd ed.Cambridge:Cambridge University Press,2005.
[35]DIDYK B M,SIMONEIT B R T,BRASSELL S C,et al.Organic geochemical indicators of palaeo-environmental conditions of sedimentation.Nature,1978,272(5650):216-222.
[36]FU Jinhua,GAO Zhenzhong,NIU Xiaobing,et al.Sedimentary microfacies characteristics and new understandings of the Upper Triassic Yanchang Formation Chang 63 interval in Huanxian area in Ordos Basin.Journal of Palaeogeography,2012,14(6):695-706.
[37]DONG Junyan,CHEN Shijia,ZOU Xianli,et al.Distribution and origin of rearranged hopanes in Yanchang Formation,Wuqi-Gaoqiao area,Ordos Basin.Petroleum Geology&Experiment,2017,39(6):834-841.
[38]YU Jian,YANG Yajuan,DU Jinliang.Sedimentation during the transgression period in Late Triassic Yanchang Formation,Ordos Basin.Petroleum Exploration and Development,2010,37(2):181-187.
[39]BAI Yubin,ZHAO Jingzhou,FANG Chaoqiang,et al.Control effect of high-quality source rocks on petroleum accumulation in Yanchang Formation,Ordos Basin.Journal of Xi’an Shiyou University(Natural Science Edition),2012,27(2):1-5.
[40]ZHANG Wenzheng,YANG Hua,LI Jianfeng,et al.Leading effect of high-class source rock of Chang 7 in Ordos Basin on enrichment of low permeability oil-gas accumulation.Petroleum Exploration and Development,2006,33(3):289-293.
[41]ZOU Caineng,YANG Zhi,TAO Shizhen,et al.Nano-hydrocarbon and the accumulation in coexisting source and reservoir.Petroleum Exploration and Development,2012,39(1):13-26.
[42]LIAO Jianbo,LI Zhiyong,LONG Liwen,et al.The effect of provenance intersection on the petroleum enrichment:An example from chang-6 member in Huaqing Area of central Ordos Basin.Xinjiang Petroleum Geology,2013,34(1):20-23.
[43]CHEN Shijia,GAO Xingjun,WANG Li,et al.Factors controlling oiliness of Jurassic Lianggaoshan tight sands in central Sichuan Basin,SW China.Petroleum Exploration and Development,2014,41(4):421-427.
[44]ZENG Lianbo,LI Zhongxing,SHI Cheng’en,et al.Characteristics and origin of fractures in the extra low-permeability sandstone reservoirs of the Upper Triassic Yanchang Formation in the Ordos Basin.Acta Geologica Sinica,2007,81(2):174-180.