定边地区辫状河沉积储层主控因素
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摘要
辫状河储层的储集能力是由储集层的岩石性质所决定,包括孔隙度和渗透率,其中孔隙度决定储层的储存能力,渗透性决定储层的渗流能力。应用沉积学、石油地质学及储层地质学等学科,结合测井、岩心观察及分析化验等资料,系统的研究了定边地区辫状河储层沉积特征及主控因素。研究表明:定边地区延10油层组的岩石类型主要为岩屑石英砂岩、长石石英砂岩以及少量的石英砂岩;孔隙度主要分布于13. 9%～17. 5%,渗透率多集中于10～16×10-3μm2,属中孔低渗储层;孔隙类型主要为粒间孔;储层类型属中孔、细喉型,排驱压力和中值压力相对较低;定边地区辫状河储层明显受控于沉积作用和成岩作用,其中,储层的砂体类型、厚度及展布和岩石学特征主要受沉积作用的影响,储层的储集能力主要受成岩作用的影响,压实作用和胶结作用会使储层的储集能力变差,而溶蚀作用会使储层的储集能力变好。
The capacity of braided river reservoirs is determined by the rock physics of the reservoir,including its porosity and permeability; porosity determines the reservoir storage capacity,and permeability determines the reservoir seepage capacity. Based on the sedimentology,petroleum and reservoir geology,combined with logging,core observations,and core analysis,the sedimentary characteristics and main controlling factors of braided river reservoirs were studied. The results show that the rock types are mainly lithic quartz sandstone,followed by feldspar quartz sandstone and a small amount of quartz sandstone. The porosity is mainly distributed at 13. 9% ～ 17. 5%,permeability is mostly concentrated in10 ～ 16 × 10-3μm2,belonging to middle pore with low permeability; pore type is mainly intergranular pores; reservoir type is a middle pore,fine throat type. Expulsion and median pressure is relatively low; the physical properties of the braided river reservoir are obviously controlled by the sedimentary and diagenesis. The sand body type,thickness,distribution and petrological characteristics of the reservoir are mainly affected by sedimentation,and the reservoir capacity is mainly affected by the diagene-sis. But the compaction and cementation will make the reservoir capacity worse,and the dissolution will make the reservoir better.
The capacity of braided river reservoirs is determined by the rock physics of the reservoir,including its porosity and permeability; porosity determines the reservoir storage capacity,and permeability determines the reservoir seepage capacity. Based on the sedimentology,petroleum and reservoir geology,combined with logging,core observations,and core analysis,the sedimentary characteristics and main controlling factors of braided river reservoirs were studied. The results show that the rock types are mainly lithic quartz sandstone,followed by feldspar quartz sandstone and a small amount of quartz sandstone. The porosity is mainly distributed at 13. 9% ～ 17. 5%,permeability is mostly concentrated in10 ～ 16 × 10-3μm2,belonging to middle pore with low permeability; pore type is mainly intergranular pores; reservoir type is a middle pore,fine throat type. Expulsion and median pressure is relatively low; the physical properties of the braided river reservoir are obviously controlled by the sedimentary and diagenesis. The sand body type,thickness,distribution and petrological characteristics of the reservoir are mainly affected by sedimentation,and the reservoir capacity is mainly affected by the diagene-sis. But the compaction and cementation will make the reservoir capacity worse,and the dissolution will make the reservoir better.
引文
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[16]崔宏伟,陈义才,任庆国,等.鄂尔多斯盆地定边地区延安组延10低渗储层微观特征[J].天然气勘探与开发,2011,34(2):15-17.CUI Hong-wei,CHEN Yi-cai,REN Qing-guo,et al. Microscopic characteristics of low-permeabillity Yan 10Member of Yanan Fornation in Dingbian Area,Ordos Basin[J]. Natural Gas Geoscience&Development,2012,34(2):15-17.
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[18]吴朝东.延安地区延安组沉积岩类型及储集性能[J].岩石学报,1996,12(4):109-112.WU Chao-dong. The reservoir characteristics and rock associations of sandstones of the Yan’an Formation in Yan’an District,Ordos Basin[J]. Acta Petrologica Sinica,1996,12(4):109-112.
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[20] Miall A D. Architectural-element analysis:a new method of facies analysis applied to fluvial deposits[J].Earth-Science Reviews,1985:22(4):261-308.
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[22]付文耀,刘春武,刘丽丽,等.鄂尔多斯盆地胡尖山油田延长组长61储层特征及控制因素分析[J].石油天然气学报,2011,33(7):45-49.FU Wen-yao,LIU Chun-wu,LIU Li-li,et al. The reservoir characteristics and controlling factors of Chang 61Formation in Hujianshan Oilfield of Ordos Basin[J].Journal of Oil and Gas Technology,2011,33(7):45-49.
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[2]于兴河,王德发,孙志华.湖泊辫状河三角洲岩相、层序特征及储层地质模型-内蒙古贷岱海湖现代三角洲沉积考察[J].沉积学报,1995,13(1):48-58.YU Xing-he,WANG De-fa,SUN Zhi-hua. Lithofacies type,vertical profile features and reservoir geological models of braided deltaic sandbodies in faulted lake basin-the observation on deposition of modern deltas in Daihai Lake,Inner Mongolia[J]. Acta Petrologica Sinica,1995,13(1):48-58.
[3]李文厚,林晋炎,袁明生,等.吐鲁番-哈密盆地的两种粗碎屑三角洲[J].沉积学报,1996,14(3):115-123.LI Wen-hou,LIN Jin-yan,YUAN Ming-sheng,et al. Two types of coarse claslic delta in Turpan-Hami Basin[J].Acta Petrologica Sinica,1996,14(3):115-123.
[4]汪彦,彭军,赵冉.准噶尔盆地西北缘辫状河沉积模式探讨——以七区下侏罗统八道湾组辫状河沉积为例[J].沉积学报,2012,20(2):264-273.WANG Yan,PENG Jun,ZHAO Ran. Dentative discussions on depositional facies model of braided stream in the Northwestern Margin,Junggar Basin:Acase of braided stream deposition of Badaowan Formation,Lower Jurassic in No. 7 Area[J]. Acta Petrologica Sinica,2012,20(2):264-273.
[5]朱筱敏,康安,王贵文,等.三塘湖盆地侏罗系辫状河三角洲沉积特征[J].石油大学学报:自然科学版,1998,22(1):17-20.ZHU Xiao-min,KANG An,WANG Gui-wen,et al. Sedimentary characteristics of Jurassic braid delta in Santanghu basin[J]. Journal of the University of Petroleum,China:Edition of Natural Science,1998,22(1):17-20.
[6]伍涛,王建国,王德发.辫状河砂体储层沉积学研究——以张家口地区露头砂体为例[J].沉积学报,1998,16(1):27-33.WU-Tao,WANG Jian-guo,WANG De-fa. Reservoir sedimentology of braided river sandbodies:a case study of the outcrop in Zhangjiakou Regin[J]. Acta Petrologica Sinica,1998,16(1):27-33.
[7]伍涛,杨勇,王德发.辫状河储层建模方法研究[J].沉积学报,1999,17(2):258-262.WU-Tao,WANG Jian-guo,WANG De-fa. Methods of reservoir modeling on braided river sandstones[J]. Acta Petrologica Sinica,1999,17(2):258-262.
[8]金振奎,杨有星,尚建林,等.辫状河砂体构型及定量参数研究——以阜康、柳林和延安地区辫状河露头为例[J].天然气地球科学,2014,25(3):311-317.JIN Zheng-kui,YANG You-xing,SHANG Jian-lin,et al.Sandbody architecture and quantitative parameters of single channel sandbodies of braided river:cases from outcrops of braided river in Fukang,Liulin and Yan’an Areas[J]. Natural Gas Geoscience,2014,25(3):311-317.
[9]李凤杰,王多云,刘自亮,等.鄂尔多斯盆地华池地区中侏罗统延安组延9油层组河流沉积及演化[J].古地理学报,2009,11(3):275-283.LI Feng-jie,WANG Duo-yun,LIU Zi-liang,et al. Fluvial deposition and evolution of Yan 9 oil-bearing interval of the Middle Jurassic Yan’an Formation in Huachi area,Ordos Basin[J]. Journal of Palaeogeography,2009,11(3):275-283.
[10]时志强,韩永林,赵俊兴,等.鄂尔多斯盆地中南部中侏罗世延安期沉积体系及岩相古地理演化[J].地球学报,2009,24(1):49-54.,SHI Zhi-qiang,HAN Yong-lin,ZHAO Jun-xing,et al.Depositional system and paleogeographic evolution of the middle Jurassic Yan’anian Stage in the Central and Southern Orodos Basin[J]. Acta Geoscientica Sinica,2003,24(1):49-54.
[11]段毅,孙涛,吴保祥,等.鄂尔多斯盆地马岭油田延10油层组油气运移特征与机理[J].成都理工大学学报:自然科学版,2009,36(1):1-7.DUAN Yi,SUN Tao,WU Bao-xiang,et al. Characteristics and mechanism of migration of crude oil in Yan 10subsection of the Yan’an Formation of the Maling oilfield in Ordos basin,China[J]. Journal of Chengdu University of Technology:Science&Technology Edition,2009,36(1):1-7.
[12]李伟,张春生.鄂尔多斯盆地胡尖山地区延安组延9油气储层沉积相研究[J].新疆石油天然气,2008,4(3):13-16.LI Wei,ZHANG Chun-sheng. Study on the sedimentary facies of Yan 9 oil-gas reservoir in Hujianshan area in the Erdos basin[J]. Xinjiang Oil and Gas. 2008,4(3):13-16.
[13]段毅,张胜斌,郑朝阳,等.鄂尔多斯盆地马岭油田延安组原油成因研究[J].地质学报,2007,81(10):1407-1415.DUAN Yi,ZHANG Sheng-bin,ZHENG Zhao-yang,et al. Study on genesis of crude oil in the Yan’an Formation of the Maling oilfield,Ordos basin[J]. Acta Geologica sinica. 2007,81(10):1407-1415.
[14]何金先,段毅,张晓丽,等.鄂尔多斯盆地林镇地区延安组延9油层组地层对比与沉积微相展布[J].天然气地球科学,2012,23(2):291-298.HE Jin-xian,DUAN Yi,ZHANG Xiao-li,et al. Stratigraphic correlation and sedimentary microfacies of Yan 9Subsection of Yan’an Formation in Linzhen Area,Ordos Basin[J]. Natural Gas Geoscience,2012,23(2):291-298.
[15]丁晓琪,张哨楠,刘朋坤,等.鄂尔多斯盆地西缘麻黄山地区延8储层特征[J].地球科学与环境学报,2010,32(1):65-69.DING Xiao-qi,ZHANG Shao-nan,LIU Peng-kun,et al.Reservoir characteristic of Yan 8 Formation in Mahuangshan Area of Western Ordos Basin[J]. Journal of Earth Sciences and Environment,2010,32(1):65-69.
[16]崔宏伟,陈义才,任庆国,等.鄂尔多斯盆地定边地区延安组延10低渗储层微观特征[J].天然气勘探与开发,2011,34(2):15-17.CUI Hong-wei,CHEN Yi-cai,REN Qing-guo,et al. Microscopic characteristics of low-permeabillity Yan 10Member of Yanan Fornation in Dingbian Area,Ordos Basin[J]. Natural Gas Geoscience&Development,2012,34(2):15-17.
[17]臧成广,张斯笛,汪青松,等.胡尖山油田侏罗系延安组延91储层特征及其控制因素[J].重庆科技学院学报:自然科学版,2013,15(4):5-9.ZANG Cheng-guang,ZHANG Si-di,WAN Qing-song,et al. Physical properties and the influencing factors of reservoir in Yan 91section of Yan’an Formation,Jurassicperiod in Hujianshan oilfield[J]. Journal of Chongqing University of Science and Technology:Natural Science Edition,2013,15(4):5-9.
[18]吴朝东.延安地区延安组沉积岩类型及储集性能[J].岩石学报,1996,12(4):109-112.WU Chao-dong. The reservoir characteristics and rock associations of sandstones of the Yan’an Formation in Yan’an District,Ordos Basin[J]. Acta Petrologica Sinica,1996,12(4):109-112.
[19]赵虹,党犇,李文厚,等.安塞地区延长组沉积微相研究[J].天然气地球科学,2004,15(5):492-497.ZHAO Hong,DANG Ben,LI Wen-hou,et al. Microfacies characteristic of Yanchang Formation in Ansai District[J]. Natural Gas Geoscience,2004,15(5):492-497.
[20] Miall A D. Architectural-element analysis:a new method of facies analysis applied to fluvial deposits[J].Earth-Science Reviews,1985:22(4):261-308.
[21]贾玉琴.鄂尔多斯盆地靖边东南部延9、延10油层组储层特征研究[D].西安:长安大学,2009.JIA Yu-qin. Study on the reservior characteristic of Yang9,Yan 10 oil-bearing in the Southeast of Jingbian Area in Ordos Basin[D]. Xi’an:Chang’an University,2011.
[22]付文耀,刘春武,刘丽丽,等.鄂尔多斯盆地胡尖山油田延长组长61储层特征及控制因素分析[J].石油天然气学报,2011,33(7):45-49.FU Wen-yao,LIU Chun-wu,LIU Li-li,et al. The reservoir characteristics and controlling factors of Chang 61Formation in Hujianshan Oilfield of Ordos Basin[J].Journal of Oil and Gas Technology,2011,33(7):45-49.
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