陕北地区侏罗系层序地层与油气聚集关系
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摘要
在现代沉积学和层序地层学理论的指导下,综合利用沉积环境标志、露头剖面、岩芯、录井、测井、地震和古生物等资料,通过层序界面的识别和划分,认为鄂尔多斯盆地东南部侏罗系划分为6个三级沉积层序更为合理。根据侏罗系旋回特征和体系域的发育情况,分析了沉积旋回的边界及演化特征和层序对侏罗系生储盖配置关系的控制作用。认为主要储层位于延安组底部的第一个长期旋回LSC2中,是位于水进体系域(TST)的河道亚相砂岩,盖层则是位于水进体系域之上的河道泛滥平原沉积的泥岩,与三叠系层序中的生油岩构成下生上储式组合,与侏罗系层序中河道间泛滥平原亚相的泥质沉积形成自生自储式组合。
Guided by the principles of modern sedimentology and sequence stratigraphy and based on comprehensively analysis of depositional environment indicators,outcrop sections,lithologies,well logs,seismic and paleontological data,the Jurassic in the southeastern of Ordos Basin is divided into six third order sedimentary sequences separated by recognizable sequence boundaries.The characteristics of sedimentary cycles and evolution of systems tract,as well as the implications for source rock and reservoir development,are discussed.The main reservoirs locate the first long time cycle LSC2 of Yan'an Formation base.They are channel subfacies sandstone of transgressive systematic range.Cap rock is mudstone of channels floodplain sedimentary above transgressive systematic range,and hydrocarbon source rock in Triassic formation constitute below-generation and above-storage,and mudstone sedimentary of interchannel floodplain subfacies in Jurassic formation form self-generation and self-storage hydrocarbon accumulation.
Guided by the principles of modern sedimentology and sequence stratigraphy and based on comprehensively analysis of depositional environment indicators,outcrop sections,lithologies,well logs,seismic and paleontological data,the Jurassic in the southeastern of Ordos Basin is divided into six third order sedimentary sequences separated by recognizable sequence boundaries.The characteristics of sedimentary cycles and evolution of systems tract,as well as the implications for source rock and reservoir development,are discussed.The main reservoirs locate the first long time cycle LSC2 of Yan'an Formation base.They are channel subfacies sandstone of transgressive systematic range.Cap rock is mudstone of channels floodplain sedimentary above transgressive systematic range,and hydrocarbon source rock in Triassic formation constitute below-generation and above-storage,and mudstone sedimentary of interchannel floodplain subfacies in Jurassic formation form self-generation and self-storage hydrocarbon accumulation.
引文
邓宏文.1995.美国层序地层研究中的新学派.石油与天然气地质,16(2):90—97
邓宏文,王洪亮.1996.层序地层地层基准面的识别、对比技术及应用.石油与天然气地质,317(3):177—184
邓宏文,王洪亮,李小孟.1997.高分辨率层序地层对比在河流相中的应用.石油与天然气地质,18(2):90—114
邓新华.1993.层序地层学的新动向.地球科学——中国地质大学学报,18(4):511—513
付国民,郑荣才,赵俊兴,李永军.2005.鄂尔多斯盆地环县地区延安组高分辨率层序地层学特征.中国矿业大学学报,34(3):394—399
时志强.2003.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.地球学报,24(1):49—54
张凤奎,张忠义,张林.2008.鄂尔多斯盆地三叠系延长组层序地层特征新认识.地层学杂志,32(1):99—105
赵俊兴,陈洪德,向方.2003.鄂尔多斯盆地中部延安地区中侏罗统延安组高分辨率层序地层研究.沉积学报,21(2):307—312
郑荣才.1998.四川盆地下侏罗统大安寨段高分辨率层序地层学.沉积学报,2(16):1—8
Cross T A.1998.Controls on coal distribution in transgressive-re-gressive cycle,Upper Cretaceous,Western Interior,U.S.A.In:Wilgaus C K.Seal-lever change:an integrated approach.SEPM,Special Publication371—380
Deng Hong-wen.1995.The newschool of sequence stratigraphic re-searchin U.S.Oil and Natural Gas Geology,16(2):90—97
Deng Hong-wen&Wang Hong-liang.1996.Identification and cor-relation techniques of sequence stratigraphic base-levels andtheir application.Oil and Natural Gas Geology,17(3):177—184
Deng Hong-wen,Wang Hong-liang&Li Xiao-meng.1997.Applica-tion of high-resolution sequence stratigraphic correlation to flu-vial facies.Oil and Natural Gas Geology,18(2):90—114
Deng Xin-hua.1993.Newdevelopment trend of sequence stratigra-phy.Earth Science:Journal of China University of Geosci-ences,18(4):511—513
Fu Guo-min,Zheng Rong-cai,Zhao Jun-xin,Li Yong-jun.2005.High resolution sequence stratigraphic characteristics of Yan’anformation in Huanxian County of Ordos Basin.Journal of Chi-na University of Mining&Technology,34(3):394—399
Shi Zhi-qiang.2003.Deposition system and paleogeographic evolu-tion of the Middle Jurassic Yan’anian stage in the central andsouthern Ordos Basin.Journal of Earth,24(1):49—54
Zhang Feng-kui,Zhang Zhong-yi&Zhan Lin.2008.Newsequencestratigraphic observations of the Triassic Yanchang Formationin the Ordos Basin.Journal of Stratigraphy,32(1):99—105
Zhao Jun-xing,Chen Hong-de&Xiang Fang.2003.The high-reso-lution sequence stratigraphy feature of Yan’an Formation inYan’an Area,Ordos Basin.Acta Sedimentologica Sinica,21(2):307—312
Zheng Rong-cai.1998.High-resolution sequence stratigraphy ofDaanzhai Formation,Lower Jurassic in Sichuan Basin.ActaSedimentologica Sinica,2(16):1—8
邓宏文,王洪亮.1996.层序地层地层基准面的识别、对比技术及应用.石油与天然气地质,317(3):177—184
邓宏文,王洪亮,李小孟.1997.高分辨率层序地层对比在河流相中的应用.石油与天然气地质,18(2):90—114
邓新华.1993.层序地层学的新动向.地球科学——中国地质大学学报,18(4):511—513
付国民,郑荣才,赵俊兴,李永军.2005.鄂尔多斯盆地环县地区延安组高分辨率层序地层学特征.中国矿业大学学报,34(3):394—399
时志强.2003.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.地球学报,24(1):49—54
张凤奎,张忠义,张林.2008.鄂尔多斯盆地三叠系延长组层序地层特征新认识.地层学杂志,32(1):99—105
赵俊兴,陈洪德,向方.2003.鄂尔多斯盆地中部延安地区中侏罗统延安组高分辨率层序地层研究.沉积学报,21(2):307—312
郑荣才.1998.四川盆地下侏罗统大安寨段高分辨率层序地层学.沉积学报,2(16):1—8
Cross T A.1998.Controls on coal distribution in transgressive-re-gressive cycle,Upper Cretaceous,Western Interior,U.S.A.In:Wilgaus C K.Seal-lever change:an integrated approach.SEPM,Special Publication371—380
Deng Hong-wen.1995.The newschool of sequence stratigraphic re-searchin U.S.Oil and Natural Gas Geology,16(2):90—97
Deng Hong-wen&Wang Hong-liang.1996.Identification and cor-relation techniques of sequence stratigraphic base-levels andtheir application.Oil and Natural Gas Geology,17(3):177—184
Deng Hong-wen,Wang Hong-liang&Li Xiao-meng.1997.Applica-tion of high-resolution sequence stratigraphic correlation to flu-vial facies.Oil and Natural Gas Geology,18(2):90—114
Deng Xin-hua.1993.Newdevelopment trend of sequence stratigra-phy.Earth Science:Journal of China University of Geosci-ences,18(4):511—513
Fu Guo-min,Zheng Rong-cai,Zhao Jun-xin,Li Yong-jun.2005.High resolution sequence stratigraphic characteristics of Yan’anformation in Huanxian County of Ordos Basin.Journal of Chi-na University of Mining&Technology,34(3):394—399
Shi Zhi-qiang.2003.Deposition system and paleogeographic evolu-tion of the Middle Jurassic Yan’anian stage in the central andsouthern Ordos Basin.Journal of Earth,24(1):49—54
Zhang Feng-kui,Zhang Zhong-yi&Zhan Lin.2008.Newsequencestratigraphic observations of the Triassic Yanchang Formationin the Ordos Basin.Journal of Stratigraphy,32(1):99—105
Zhao Jun-xing,Chen Hong-de&Xiang Fang.2003.The high-reso-lution sequence stratigraphy feature of Yan’an Formation inYan’an Area,Ordos Basin.Acta Sedimentologica Sinica,21(2):307—312
Zheng Rong-cai.1998.High-resolution sequence stratigraphy ofDaanzhai Formation,Lower Jurassic in Sichuan Basin.ActaSedimentologica Sinica,2(16):1—8
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