元坝地区须三段沉积特征
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摘要
通过地质、测井、地震资料对元坝地区须三段沉积相进行了深入细致的研究,结果表明:①元坝工区西部地层为砂岩与泥岩的不等厚互层,东部地层为底部厚套砂体与顶部泥岩的叠置层;纵向上五期砂组相互叠置.②须三段沉积时期龙门山北段、米仓山—大巴山同时为元坝工区提供物源.母岩的不同导致元坝工区发育2类砂岩,西部以钙屑砂砾岩为主,东部以岩屑石英砂岩为主.③元坝工区须三段西部发育辫状河三角洲沉积体系,垂向上呈现三角洲前缘—三角洲平原向盆地内进积的沉积序列;东部发育曲流河沉积体系,呈现三角洲前缘向盆缘退积的沉积序列.
High oil yield was obtained from the 3th member of Xujiahe Formation of YL7 and YL10 wells in Yuanba area,which subverts the traditional understanding that the 3th member of Xujiahe Formation( T3X3) is hydrocarbon generation rock and the calcarenaceous sandstone is non-reservoir rock. The sedimentary facies of T3X3is studied deeply according to geologic,logging and seismic data. The results show that,①there is sandstone and mudstone interbeds of unequal thickness in the western Yuanba area,while in the eastern Yuanba area is overlaying layer of sandstone and mudstone,the sandstone at the bottom and the mudstone on the top. In vertical direction,five sand groups overlap each other. ②In the sedimentary period of T3X3,the northern segment of Longmen mountain and Michang- Daba mountain provide sedimentary source at the same time. Due to the different sedimentary source,there are two kinds of sandstone in Yuanba area,calcarenaceous sandstone deposits mainly in the west,while lithic quartz sandstone deposits mainly in the east. ③ in the west of T3X3develops a braided river delta sedimentary system,which is characterized by the acceleration sedimentary sequence from delta front-delta plain to basin in vertical direction. In the east of T3X3,develops a meaning river delta sedimentary system,which is characterized by the retrogradation sedimentary sequence from delta front to basin edge.
High oil yield was obtained from the 3th member of Xujiahe Formation of YL7 and YL10 wells in Yuanba area,which subverts the traditional understanding that the 3th member of Xujiahe Formation( T3X3) is hydrocarbon generation rock and the calcarenaceous sandstone is non-reservoir rock. The sedimentary facies of T3X3is studied deeply according to geologic,logging and seismic data. The results show that,①there is sandstone and mudstone interbeds of unequal thickness in the western Yuanba area,while in the eastern Yuanba area is overlaying layer of sandstone and mudstone,the sandstone at the bottom and the mudstone on the top. In vertical direction,five sand groups overlap each other. ②In the sedimentary period of T3X3,the northern segment of Longmen mountain and Michang- Daba mountain provide sedimentary source at the same time. Due to the different sedimentary source,there are two kinds of sandstone in Yuanba area,calcarenaceous sandstone deposits mainly in the west,while lithic quartz sandstone deposits mainly in the east. ③ in the west of T3X3develops a braided river delta sedimentary system,which is characterized by the acceleration sedimentary sequence from delta front-delta plain to basin in vertical direction. In the east of T3X3,develops a meaning river delta sedimentary system,which is characterized by the retrogradation sedimentary sequence from delta front to basin edge.
引文
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[2]朱如凯,白斌,刘柳红,等.陆相层序地层学标准化研究和层序岩相古地理:以四川盆地上三叠统须家河组为例[J].地学前缘,2011,18(4):131-143.ZHU Ru-kai,BAI Bin,LIU Liu-hong,et al.Resaerch on standardization of continental sequence straigraphy and palaeogeogra-phy:A case study from the Upper Triassic Xujiahe Formation in Sichuan Basin[J].Earth Science Fronties,2011,18(4):131-143.
[3]张志杰,李伟,杨家静,等.川中广安地区上三叠统须家河组岩相组合与沉积特征[J].地学前缘,2009,16(1):296-305.ZHANG Zhi-jie,LI Wei,YANG Jia-jing,et al.Lithofacies association and depositional characteristics of the Upper Triassic Xujiahe Formation in Guang'an area[J].Earth Science Fronties,2009,16(1):296-305.
[4]曹烈,王信,黎青.川中资阳地区须家河组含油气系统及堪探前景分析[J].天然气勘探与开发,2012,35(4):1-5.CAO Lie,WANG Xing,LI Qing.Petroleum system and exploration of Xujiahe Formation in Ziyang area'central Sichuan Basin[J].Natural Gas Exploration&Development,2012,35(4):1-5.
[5]何超红,杨辉廷.普光地区须家河组沉积沉积相及储层特征[J].四川地质学报,2013,33(1):49-53.HE Chao-hong,YANG Hui-ting.Study of sedimentary facies and reservoir geology of the Xujiahe Formation in the Puguang Region[J].Acta Geologica Sichuan,2013,33(1):49-53.
[6]郭旭升.川西地区中、晚三叠世岩相古地理演化及勘探意义[J].石油与天然气地质,2010,32(5):610-619.GUO Xv-sheng.Litho-palaeogeographic evolution in the Middle-Late Triassic in western Sichuan Province and its significance for petroleum exploration[J].Oil&Gas Geology,2010,32(5):610-619.
[7]盘昌林,刘树根,马永生,等.川东北须家河组储层特征及主控因素[J].西南石油大学学报:自然科学版,2011,33(3):27-34.PAN Chang-lin,LIU Shu-gen,MA Yong-sheng,et al.Reservoir characteristics and main controlling factors of the Xujiahe formation in northeastern Sichuan Basin[J].Journal of Southwest Petroleum University:Science&Technology Edition,2011,33(3):27-34.
[8]周彦,黎平,谭秀成,等.川东北须家河组砂岩储层成岩特征研究[J].西南石油大学学报:自然科学版,2011,33(6):20-24.ZHOU Yan,LI Ping,TAN Xiu-cheng,et al.Study on diagensis characteristics sandstone reservoir in Xujiahe formation in northeastern Sichuan Basin[J].Journal of Southwest Petroleum University:Science&Technology Edition,2011,33(6):20-24.
[9]白斌,邹才能,朱如凯,等.四川盆地九龙山构造须二段致密砂岩储层裂缝特征、形成时期与主控因素[J].石油与天然气地质,2012,33(4):526-535.BAI Bin,ZOU Cai-neng,ZHU Ru-kai,et al.Characteristics,timing and controlling factors of structural fractures in tight sandstones of the 2nd member of Xujiahe Formation in Jiulong Mountain structure,Sichuan Basin[J].Oil&Gas Geology,2012,33(4):526-535.
[10]颜照坤.龙门山与前陆盆地之间的剥蚀-沉积系统研究[D].成都:成都理工大学,2011.
[11]王燕,杨少春,卞炜,等.辫状河三角洲前缘厚油层细分:以新街油田台7断块为例[J].西安石油大学学报:自然科学版,2012,27(2):13-16.WANG Yan,YANG Shao-chun,BIAN Wei,et al.Subdivision of the thick oil layer of braided river delta front:taking Tai 7 fault block in Xinjie Oilfield as an example[J].Journal of Xi'an Shiyou University:Natural Science Edition,2012,27(2):13-16.
[12]淡永.川东北须家河组物源分析与沉积体系研究[D].成都:成都理工大学,2011.
[13]纪友亮,李清山,王勇,等.高邮凹陷古近系戴南组三角洲沉积体系及沉积相模式[J].地球科学与环境学报,2012,34(1):9-19.JI You-liang,LI Qing-shan,WANG Yong,et al.Fan delta sedimentary system and facies models of Dainan formation of Paleogene in Gaoyao Sag[J].Joural of Earth Sciences and Enviorment,2012,34(1):9-19.
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