束鹿凹陷西斜坡沙二段油藏分布规律及成藏模式
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摘要
束鹿凹陷西斜坡位于冀中坳陷南缘,是一个典型的东断西超窄陡型斜坡带。其资源转化率低,勘探潜力较大。结合区域地质背景分析,应用高分辨率层序地层学,储层沉积学及石油地质学原理与方法,采用地质与地球物理学结合的新理论与新技术的手段,利用钻井、测井及地震资料,深入分析了区内沙二段油气藏类型、分布规律和成藏模式。研究认为束鹿斜坡外带沙河街组地层遭受剥蚀,坡上不整合带是斜坡带常见的油气聚集场所,主要发育地层油藏以及少量岩性油藏。在斜坡带内带的鼻状构造和断块,为有利的油气聚集区。而且砂砾岩体厚度大、连通性好,因此在断层和岩性双重因素的控制下易形成构造-岩性复合油气藏。并总结了断裂坡折带砂体上倾尖灭型成藏模式,顺、反向断层联合控藏和断块鼻状构造隆起成藏模式等模式,对束鹿西斜坡勘探方向具有一定的指导作用。
The west slope of the Shulu Sag is located at the south rim of the Jizhong Depression,and is a typical narrow and steep slope faulted to the east and onlapped to the west.The sag has a low transformation rate of resources and high exploration potential.This paper deeply analyzes the type,distribution and hydrocarbon accumulation pattern of the Es2 reservoirs in this area based on regional geological setting,using principles and methods of high resolution sequence stratigraphy,reservoir sedimentology and petroleum geology,adopting new theory and technology that combine geology with geophysics,and employing drilling,logging and seismic data.The research indicates that the Shahejie formation on the outskirts of the slope had been denuded,and the unconformity belt on the slope is a common site of hydrocarbon accumulation,where mainly developed stratigraphic reservoirs and some lithological reservoirs.The nosing structures and fault-blocks within the slope are favorable hydrocarbon accumulation zones.The glutenite body is thick and has good connectivity,therefore is likely to form structural-lithological reservoir under the control action of both fault and lithology.It is summarized that the patterns of hydrocarbon accumulation include updip pinchout on break of slope,pools controlled by combination of consequent and antithetic faults,and nosing structure uplift.This research can guide exploration in the west slope of Shulu Sag.
The west slope of the Shulu Sag is located at the south rim of the Jizhong Depression,and is a typical narrow and steep slope faulted to the east and onlapped to the west.The sag has a low transformation rate of resources and high exploration potential.This paper deeply analyzes the type,distribution and hydrocarbon accumulation pattern of the Es2 reservoirs in this area based on regional geological setting,using principles and methods of high resolution sequence stratigraphy,reservoir sedimentology and petroleum geology,adopting new theory and technology that combine geology with geophysics,and employing drilling,logging and seismic data.The research indicates that the Shahejie formation on the outskirts of the slope had been denuded,and the unconformity belt on the slope is a common site of hydrocarbon accumulation,where mainly developed stratigraphic reservoirs and some lithological reservoirs.The nosing structures and fault-blocks within the slope are favorable hydrocarbon accumulation zones.The glutenite body is thick and has good connectivity,therefore is likely to form structural-lithological reservoir under the control action of both fault and lithology.It is summarized that the patterns of hydrocarbon accumulation include updip pinchout on break of slope,pools controlled by combination of consequent and antithetic faults,and nosing structure uplift.This research can guide exploration in the west slope of Shulu Sag.
引文
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[11]杨立干.金湖凹陷古近系戴一段成藏条件和成藏模式研究[J.]岩性油气藏,2008,20(3):34-39.
[2]邱隆伟,等.束鹿凹陷古近纪构造活动对沉积作用的影响[J].油气地质与采收率2,0061,3(5):3-7.
[3]潘元林,等.中国隐蔽油气藏[M].北京:地质出版社1,998:7-28.
[4]于兴河,等.中国东部中、新生代陆相断陷盆地沉积充填模式及其控制因素——以济阳坳陷东营凹陷为例[J].岩性油气藏2,0071,9(1):39-45.
[5]肖焕钦,等.陆相断陷盆地隐蔽油气藏分类及勘探[J].特种油气藏2,0029,(5):10-13.
[6]李兴国.陆相储层沉积微相与微型构造[M].北京:石油工业出版社2,000:25-88.
[7]李存贵,等.文南油田沙一段油藏形成条件及分布规律[J].石油勘探与开发2,0043,1(3):34-38.
[8]李莉,等.白音查干凹陷达尔其油田油气成藏规律[J].成都理工大学学报:自然科学版,2007,34(3):277-284.
[9]单体珍.桩海地区沙一、沙二段成藏模式[J].特种油气藏2,0081,5(3):45-50.
[10]刘宗堡,等.大型凹陷斜坡带油气成藏模式——以三肇凹陷葡萄花油层为例[J].吉林大学学报:地球科学版,2008,38(6):937-944.
[11]杨立干.金湖凹陷古近系戴一段成藏条件和成藏模式研究[J.]岩性油气藏,2008,20(3):34-39.
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