断陷盆地顺向断坡油气优势运移通道及聚油模式——以渤海湾盆地沾化凹陷孤北斜坡为例  

Dominant migration pathway and accumulation model of petroleum along the consequent fault slope in the fault basin:taking Gubei Slope of Zhanhua Sag in the Bohai Bay Basin as an example

作　　者：吴安彬 罗群[1] 崔倩 张晨[2] 姜振学[1] WU Anbin;LUO Qun;CUI Qian;ZHANG Chen;JIANG Zhenxue(Unconventional Oil and Gas Institute,China University of Petroleum(Beijing),Beijing 102249,China;School of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249

出　　处：《东北石油大学学报》2020年第1期53-64,I0004,I0005,共14页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(41672118);国家自然科学基金项目(41372145)。

摘　　要：为明确断陷盆地顺向断坡隐蔽油气藏形成的主控因素和运聚规律,以渤海湾盆地沾化凹陷孤北斜坡为例,采用构造地质学、岩相学与地球化学结合的方法,探讨优势运移通道及聚油模式。结果表明:研究区顺向断坡油气聚集表现为“综合控运”模式,其中断裂和砂体占主导,是油气成藏的关键控制因素。断裂对油气进行垂向输导,汇聚型断裂相对发散型断裂具有明显的控运优势,在汇聚型断裂带上油气包裹体更发育,均一化温度分布范围更广。砂体是油气侧向输导的关键,与不整合构造搭配为油气侧向调整提供优势运移通道。在该聚油模式的控制下,顺向断坡带油气空间分布规律强,主要沿汇聚型断裂与输导型砂体耦合分布,地形上表现为沿“断鼻”分布。顺向断坡带是断陷盆地普遍发育的构造单元,该结果可为同类研究提供参考。In order to clarify the main controlling factors and accumulation rules for the formation of concealed reservoirs along the consequent fault slope,taking the Gubei Slope in Zhanhua Sag of the Bohai Bay Basin as an example,its advantageous migration pathway and accumulation mode of petroleum are discussed by structural geology,petrography and geochemistry.The results show that the petroleum accumulation in the consequent fault slope is characterized by comprehensive control and transportation mode,while the faults and sand may be the key controlling factors for hydrocarbon accumulation.Specifically,the faults conduct the vertical transportation of petroleum,and the converging faults have more obvious advantages in controlling the transportation compared with the divergent faults.The hydrocarbon inclusions are better developed on the converging faults,and the homogenization temperature distribution range is wider.Sand is the key to lateral petroleum transmission,and it is combined with unconformity structure to provide superior migration channel for lateral adjustment of petroleum.Under the control of the mode,the spatial distribution of petroleum in the consequent fault slope is regular,mainly distributed along the coupling of the convergent faults and sand,and the topography is along the"fault nose".Since the consequent fault tectonic unit generally developed in fault basins,this study is expected to provide a useful reference for similar research.

关 键 词：优势运移通道 聚油模式 顺向断坡 孤北斜坡 渤海湾盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]