鄂尔多斯盆地吴起曾岔地区前侏罗纪古地貌与油藏成藏规律  

Palaeogeomorphic features of pre-Jurassic and accumulation regularity of oil reservoir of Zengcha Area in Wuqi County,Ordos Basin

作　　者：王霞 刘凤林[3] 范柏江[2] 商宗龙[1] 靳星 Wang Xia;Liu Feng-lin;Fan Bo-jiang;Shang Zong-long;Jin Xing(School of Earth Science and Resources,Chang'an University,Xi'an 710064,China;School of Petroleum and Environment Engineering,Yan'an University,Yan'an 716000,Shaanxi,China;Changqing Oilfield Company No.1 Oil Production Plant,PetroChina,Yan'an 716000,Shaanxi,China;School of Petroleum Engineering,China University of Petroleum,QingDao 266580,Shandong,China)

机构地区：[1]长安大学地球科学与资源学院,西安710064 [2]延安大学石油工程与环境工程学院,陕西延安716000 [3]中国石油长庆油田公司第一采油厂,陕西延安716000 [4]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《兰州大学学报（自然科学版）》2020年第1期8-15,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金资助项目(41702136);延安市科技项目(2015CHTD-04,2018KN-06);延安大学2017年科研计划项目(YDQ2017-22);延安大学2017年大学生创新创业训练项目(D2017122)。

摘　　要：为深化对鄂尔多斯盆地曾岔地区侏罗系油藏成藏规律认识,运用钻井、测井、试油及实际生产数据等各种资料,采用印模法精细刻画了前侏罗纪古地貌的地质,综合分析了前侏罗纪古地貌特征、油藏富集规律及成藏模式.结果表明,曾岔地区前侏罗纪发育古河道、古阶地、斜坡、低残丘及河间丘5种古地貌单元,已探明延9、延10油藏主要分布在古地貌中地形低的古河道部位而非普遍认为的较高斜坡、河间丘上;研究区存在3种油藏成藏模式:古河道-辫状河道-三角洲平原模式、古河道-分流河道-三角洲平原模式和斜坡-辫状河道-三角洲平原模式,前两种是主要成藏模式.古地貌控制下的"油源足、渗砂优、通道畅"的成藏组合,是油藏形成的基本条件.古河道部位物性相对较好的(分流)河道砂体带与低幅鼻状隆起构造的重叠区是勘探部署优选区域.In order to understand the accumulation regularity of the oil reservoir,Zengcha Area,Ordos Basin and guide further exploration and deployment in a much better way,and based on the data of drilling,logging,oil test and production,the palaeogeomorphic formwork of Pre-Jurassic was rebuilt,and the geologic maps made up using the impressing method.The results showed that there were five palaeogeomorphic units:paleo channel,paleo terrace and paleo slope,low monadnock and interchannel mound.Proven Yan 9 and Yan 10 oil reservoirs were mainly distributed in the paleo channels and paleo slopes,different from previous studies that indicated lower Jurassic oil reservoirs were mainly distributed in a relatively high terrain such as paleo slope.Three oil accumulation patterns were established:paleo channel-braided channel-delta plain pattern,paleo channel-distributary channel-delta plain pattern and paleo slope-braided channel-delta plain pattern,and the former two were the main palaeogeomorphic reservoirs.The controlling factors of oil accumulation of the Jurassic reservoir could be briefly summarized as sufficient oil source,high-quality physical properties and predominant migration pathway.It was suggested that the overlapping sites of the paleo channel sandbody possessed a relatively good physical properties and the low-amplitude uplift structures represented favorable oil exploration targets.

关 键 词：古地貌 富集规律 成藏模式 前侏罗纪 

分 类 号：P531[天文地球—古生物学与地层学] TE122.1[天文地球—地质学]