志靖-安塞地区长2油层组成藏条件及分布规律  

Hydrocarbon accumulation conditions and distribution laws of Chang-2 reservoir in Zhijing-Ansai area,China

作　　者：冯顺彦[1,2] 淡卫东[1,2] 张晓辉[1,2] 宋娟 李成[1,2] 周树勋[1,2] 陈韶华[3] 任继胜[3] FENG Shunyan;DAN Weidong;ZHANG Xiaohui;SONG Juan;LI Cheng;ZHOU Shuxun;CHEN Shaohua;REN Jisheng(Exploration and Development Research Institute of Changqing Oilfield Company, PetroChina, Xi'an 710018, China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China;No.2 Mud Logging Branch Company, CNPC Bohai Drilling Engineering Co., Ltd., Renqiu 062550, China)

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,西安710018 [2]低渗透油气田勘探开发国家工程实验室,西安710018 [3]中国石油集团渤海钻探工程有限公司第二录井分公司,河北任丘062550

出　　处：《成都理工大学学报（自然科学版）》2020年第4期451-459,共9页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05046-005);中国石油股份公司重大科技专项(2016E-0505)。

摘　　要：探讨鄂尔多斯盆地志靖-安塞地区三叠系延长组长2油层组的成藏控制因素及油藏富集规律。在沉积相、砂体展布及油藏特征研究的基础上,结合测试分析、测井、录井、试油、试采等资料,对长2油层组烃源岩、沉积微相、储渗砂体、运移通道、盖层及圈闭条件等进行综合分析。结果表明:南区长2地层遭受剥蚀,大面积缺失,发育零星小规模油藏;北区远离烃源岩,在缺少远距离运移通道的情况下,难以成藏;中区紧邻烃源岩,储渗砂体、裂缝及不整合面构成向上运移通道,鼻隆构造与长213上部层系具有遮挡能力的泥岩作为有利圈闭,是油气聚集成藏的有利场所。研究区发育岩性、构造-岩性、弱构造-岩性等3种油藏类型,长2油层组具有“渗透性砂岩为主的多运移通道、构造与岩性双重控制、盖层与砂体结构决定纵向分布”的近源成藏模式。Based on the study of sedimentary facies,distribution of sand bodies and reservoir characteristics,combined with the data of chemical analysis,well logging,logging,oil testing and production testing,the source rock,sedimentary microfacies,dominant sand body,migration channel,caprock and trap conditions of Chang-2 oil Formation are analyzed so as to unravel the control factors of reservoir formation and accumulation regularity of Chang-2(Member 2 of Yanchang Formation)oil Formation in Zhijing-Ansai area of Ordos Basin.The results show that the Chang-2 in the south area is lack in most region duo to the denudation and only sporadic small-scale reservoirs are developed.In the north area,the Chang-2 is far away from the source rock,and it is difficult to form reservoir without the long-distance migration channel.The Chang-2 in the middle area is adjacent to the hydrocarbon source rock,and the reservoir sand body,fractures and unconformity surface constitute the upward migration channel,the mudstone of upper layer of Chang-213 and the nose lift structure form the trap,which constitute favorable place for oil and gas accumulation.In this area there are three types of oil reservoirs,i.e.lithologic reservoir,structural lithologic reservoir and weak structural lithologic reservoir.The Chang-2 reservoir displays a near-source reservoir formation model,with multiple migration channels dominated by permeable sandstone,characterized by dual control of structure and lithology,and vertical distribution of cap layer and sand body.

关 键 词：鄂尔多斯盆地 志靖-安塞地区 长2油藏 成藏主控因素 油藏类型 

分 类 号：TE122.31[石油与天然气工程—油气勘探]