陈家洼陷沙三下亚段层序地层和沉积相分析
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摘要
辽河西部凹陷陈家洼陷具备形成良好隐蔽圈闭的石油地质条件。在综合分析地震、钻井、测井和岩芯等各种资料的基础上,对陈家洼陷沙三下亚段进行了高精度层序地层和沉积相研究,并结合区域构造和成藏地质条件分析,进行隐蔽圈闭预测。结果表明,陈家洼陷沙三下亚段可划分为3个四级层序,并在四级层序内部以最大水进面为界,识别出水进体系域和高位体系域;陈家洼陷沙三下亚段发育4种主要的沉积相类型:扇三角洲、近岸水下扇、湖泊及深水重力流沉积;受断裂体系和古地貌的控制,该区北部发育扇三角洲—浅湖—深湖(半深湖)沉积体系,南部主要发育近岸水下扇—深湖(半深湖)沉积体系;根据沉积相的平面展布及演化特征,结合隐蔽圈闭成藏地质条件分析,提出了1个发育扇三角洲前缘砂体上倾尖灭型隐蔽圈闭的有利勘探靶区。
There is a good oil geological condition in the Sha 3 lower subinterval in Chenjia Depression,western Liaohe Sag.Based on seismic,drilling,logging and core data,combined with the distribution of depositional systems and oil geological condition analysis,the sequence stratigraphy and sedimentology characteristics of the Sha 3 lower subinterval are researched to predict favorable subtle traps.The conclusions are as the following,the Sha 3 lower subinterval can be divided into three four-order sequence,and fourth-order sequences are further divided into transgressive and highstand system tracts,there are four kinds of sedimentary systems identified in th target layers,including fan delta,nearshore subaqueous fan,lacustrine and deep lacustrine turbidity sedimentary systems,controlled by fault systems and palaeogeomorphy,there are two depositional systems,i.e.,fan delta-shallow lacustrine-deep(hemideep) lacustrine in northern area and nearshore subaqueous fan- deep(hemideep) lacustrine in Southern area,finally,according to the plane distribution,evolvolution features of sedimentary systems and the subtle pool-forming condition,a potential exploration prospect is proposed,which is formed by fan delta front updip pinchot.
There is a good oil geological condition in the Sha 3 lower subinterval in Chenjia Depression,western Liaohe Sag.Based on seismic,drilling,logging and core data,combined with the distribution of depositional systems and oil geological condition analysis,the sequence stratigraphy and sedimentology characteristics of the Sha 3 lower subinterval are researched to predict favorable subtle traps.The conclusions are as the following,the Sha 3 lower subinterval can be divided into three four-order sequence,and fourth-order sequences are further divided into transgressive and highstand system tracts,there are four kinds of sedimentary systems identified in th target layers,including fan delta,nearshore subaqueous fan,lacustrine and deep lacustrine turbidity sedimentary systems,controlled by fault systems and palaeogeomorphy,there are two depositional systems,i.e.,fan delta-shallow lacustrine-deep(hemideep) lacustrine in northern area and nearshore subaqueous fan- deep(hemideep) lacustrine in Southern area,finally,according to the plane distribution,evolvolution features of sedimentary systems and the subtle pool-forming condition,a potential exploration prospect is proposed,which is formed by fan delta front updip pinchot.
引文
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[9]贾承造,赵文智,邹才能,等.岩性地层油气藏地质理论与勘探技术[J].石油勘探与开发,2007,34(3):257-282.
[10]Peter R Vail,Scott A Bowman.Sequence stratigraphic concepts applied to stratal patterns in the cretaceous seaway,western interior of North America[J].Geolog-ical Society of America,1987,19(7):875-878.
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[12]Henry W Posamentier,George P Allen.Variability of the sequence stratigraphic model:effects of local basin fac-tors[J].Sedimentary Geology,1993,86(1):91-109.
[2]朱芳冰.辽河盆地西部凹陷源岩热演化及生烃史研究[J].地质科技情报,2000,19(3):53-56.
[3]侯彦东.陈家洼陷沙三段油气藏成藏条件研究[J].断块油气田,2001,8(4):1-4.
[4]王勇,鲍志东,张春雷,等.西部凹陷北部沙河街组成岩作用及岩相研究[J].西南石油大学学报(自然科学版),2008,30(5):64-68.
[5]郑荣才,吴朝荣.西部凹陷深层沙河街组生储盖组合的层序分析[J].成都理工学院学报,1999,26(4):348-356.
[6]李思田,潘元林,陆永潮,等.断陷湖盆隐蔽油藏预测及勘探的关键技术——高精度地震探测基础上的层序地层学研究[J].地球科学,2002,27(5):592-598.
[7]贾承造,赵文智,邹才能,等.岩性地层油气藏勘探研究的两项核心技术[J].石油勘探与开发,2004,31(3):3-9.
[8]牛嘉玉,冯有良,鲁卫华,等.中国东部陆相湖盆层序类型与岩性圈闭发育特征[J].石油学报,2006,27(7):18-22.
[9]贾承造,赵文智,邹才能,等.岩性地层油气藏地质理论与勘探技术[J].石油勘探与开发,2007,34(3):257-282.
[10]Peter R Vail,Scott A Bowman.Sequence stratigraphic concepts applied to stratal patterns in the cretaceous seaway,western interior of North America[J].Geolog-ical Society of America,1987,19(7):875-878.
[11]Henry W Posamentier,David H James.Variations of the sequence stratigraphic model:past concepts,present un-derstandings and future directions[J].AAPG Bulletin,1991,75(3):655-656.
[12]Henry W Posamentier,George P Allen.Variability of the sequence stratigraphic model:effects of local basin fac-tors[J].Sedimentary Geology,1993,86(1):91-109.
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