鄂尔多斯盆地泾河油田走滑断裂带油气成藏特征及控藏机制  

Hydrocarbon Accumulation Characteristics and Controlling Mechanism of Strike-Slip Faults in Jinghe Oilfield,Ordos Basin

作　　者：杨鑫 平宏伟[1] 雷涛[2] 张新乐 邵隆坎[2] 苏奥 陆骋[2] 孟玉净 唐大卿[1] Yang Xin;Ping Hongwei;Lei Tao;Zhang Xinle;Shao Longkan;Su Ao;Lu Cheng;Meng Yujing;Tang Daqing(Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences,Wuhan 430074,China;SINOPEC North China Oil and Gas Branch,Zhengzhou 450006,China;School of Geosciences,Yangtze University,Wuhan 430100,China)

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国石化华北油气分公司,河南郑州450006 [3]长江大学地球科学学院,湖北武汉430100

出　　处：《地球科学》2023年第6期2324-2341,共18页Earth Science

基　　金：国家自然科学基金面上项目(No.42072176);中国石油化工股份有限公司科技项目(No.P21026).

摘　　要：近年来,泾河油田围绕走滑断裂带断缝体油藏勘探取得重要突破,揭示了新的油气勘探领域.深入理解走滑断裂带油气成藏特征及控藏机制则是厘定断缝体型油藏富集规律的重要前提.利用流体包裹体技术结合方解石超低浓度U⁃Pb定年对储层成岩作用和油气充注过程进行了系统研究,探讨了走滑断裂带油气分布特征及控制因素.结果表明:研究区储层主要发育两期早期方解石胶结(185±27 Ma和159±52 Ma)以及相对较晚的橙黄色、蓝绿色和蓝色荧光三期油连续充注(140.1~96.8 Ma),具有“先致密、后成藏”的特征.走向上,走滑断裂带原油物性具有“东低西高”、产量具有“东高西低”、油气成藏时间均具有“东早西晚”的分段特点;垂向上,走滑断裂带流体活动也存在明显差异,长6、长7段储层碳酸盐胶结作用较弱,以蓝绿色和蓝色荧光晚期油充注为主;而长8段碳酸岩盐胶结作用较强,表现为三期油充注、多期油成藏的特征.总体上,走滑断裂控制了研究区油气整体由东向西高效侧向运移,但由于走向上构造应力的变化局部控制了油气沿走滑断裂带分段差异富集(单井产量高低).长6-长7储层原始物性差以及长7段大套泥页岩的发育,限制了走滑断裂垂向流体输导能力,导致流体主要在长8段优势聚集,分层差异富集.研究结果可为进一步明确研究区的断缝体油藏的分布规律及成藏模式提供重要支撑.In recent years,Jinghe oilfield has made important breakthroughs in the exploration of fault-fracture body reservoirs around strike-slip fault zones,revealing new fields for hydrocarbon exploration.Deeply understanding of the characteristics of hydrocarbon accumulation and control mechanism in strike-slip fault zone is an important prerequisite for determining the enrichment model of fault-fracture type reservoirs.In this paper,reservoir diagenesis and hydrocarbon charging process have been systematically studied using fluid inclusion technique and calcite ultra-low concentration U-Pb dating and the hydrocarbon distribution characteristics and controlling factors in strike-slip fault zones are also discussed.The results show that there are mainly two stages of early calcite cementation(185±27 Ma and 159±52 Ma,respectively)and the relatively late stage of orange-yellow,blue-green and blue fluorescent oil charge(140.1-96.2 Ma).In strike-slip fault zones,the physical property of crude oil is low in the east and high in the west,the oil production is high in the east and low in the west,and the oil accumulation time is early in the east and late in the west.The carbonate cementation in the Chang 6 and Chang 7 members is weak,and the late blue-green and blue fluorescence oil charges are dominant,but the carbonate cementation of Chang 8 member is intense,which is characterized by three stages of oil charging.On the whole,the strike-slip fault controls the lateral migration of hydrocarbon with high efficiency,but the differences of hydrocarbon enrichment along the strike-slip fault zone is partly controlled by the variation of tectonic stress.The poor original physical property of Chang 6-Chang 7 reservoir and the development of large shale in Chang 7 member limit the vertical fluid transporting ability of strike-slip fault,which leads to fluid predominance and differential accumulation in Chang 8 member.The research results can provide important support for further determining the distribution pattern and oil reservo

关 键 词：鄂尔多斯盆地 走滑断裂 断缝体 流体包裹体 油气成藏 石油地质. 

分 类 号：P618[天文地球—矿床学]