鄂尔多斯盆地延长组裂缝特征及其控藏作用  

Characteristics of Fractures and Their Controls on Yanchang Formation Reservoir in Ordos Basin

作　　者：肖正录 路俊刚[1,2,3] 李勇[1,2,3] 张海[4] 尹相东[1,2,3] 周翔 XIAO Zhenglu;LU Jungang;LI Yong;ZHANG Hai;YIN Xiangdong;ZHOU Xiang(Southwest Petroleum University,National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan 610500,China;Southwest Petroleum University,Sichuan Key Laboratory of Natural Gas Geology,Chengdu,Sichuan 610500,China;Southwest Petroleum University,School of Geoscience and Technology,Chengdu,Sichuan 610500,China;Jingbian Oil Production Plant,Yanchang Oilfield Co.,Ltd.,Yan’an,Shaanxi 716000,China)

机构地区：[1]西南石油大学油气藏地质及开发工程全国重点实验室,成都610500 [2]西南石油大学天然气地质四川省重点实验室,成都610500 [3]西南石油大学地球科学与技术学院,成都610500 [4]延长油田股份有限公司靖边采油厂,陕西延安716000

出　　处：《新疆石油地质》2023年第5期535-542,共8页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(42072185,42002176)。

摘　　要：为确定断裂发育区油气充注聚集在时间上的持续性和在空间上的有序性,以鄂尔多斯盆地南缘上畛子—转角地区为例,分析裂缝形成期次与油藏分布的关系,探讨裂缝对延长组油藏的控制作用。研究表明,延长组主要发育燕山运动期二幕、燕山运动期三幕和喜马拉雅运动期共3期裂缝,不同期次裂缝对油气运聚的作用不同。近源油藏捕获了烃源岩从低熟到成熟阶段的所有产物,在燕山运动期三幕和喜马拉雅运动期遭到破坏,原油向远源区调整。研究区南部靠近渭北隆起,其裂缝的纵向连通性及砂体发育程度较强,原油在远源储集层中富集;研究区北部原油主要滞留在近源储集层中。因此,裂缝与砂体对接形成的输导网络,可以对油藏起到调整作用,在多期次裂缝的沟通下,近源和远源油藏的资源量立体互补。In order to determine the temporal continuity and spatial orderliness of hydrocarbon charging and accumulation in fault areas,taking the Shangzhenzi farm-Zhuanjiao area at the southern margin of the Ordos basin as an example,the relationship between fracture for-mation period and reservoir distribution was analyzed,and the controls of fractures on Yanchang formation reservoir was discussed.The study shows that the fractures of three periods(Yanshanian movement episode II and III,and Himalayan movement)are developed in Yan-chang formation,showing varying impacts on hydrocarbon migration and accumulation.Near-source oil reservoirs captured all the hydrocar-bons generated from the source rocks in immature and mature stages,which were subsequently destroyed during the Yanshanian episode III and the Himalayan movement,leading to oil migration towards the areas far away from source rocks.In the southern part of the study area,close to the Weibei uplift,fractures are well connected longitudinally and sand bodies are well developed,allowing oil enrichment primarily in reservoirs far away from source rocks.In the northern part of the study area,oil is predominantly retained in reservoirs near source rocks.Consequently,fractures and sand bodies are connected to form a transport network that plays a role in adjusting reservoirs.By virtue of multi-stage fractures,resources in reservoirs near or far away from source rocks can be complemented and integrated.

关 键 词：鄂尔多斯盆地 延长组 裂缝 油气成藏 控藏机制 差异聚集 次生调整 

分 类 号：TE122[石油与天然气工程—油气勘探]