塔里木盆地寒武系盐下构造-岩相古地理、规模源储分布与勘探区带评价  

Tectonic-lithofacies paleogeography,large-scale source-reservoir distribution and exploration zones of Cambrian subsalt formation,Tarim Basin,NW China

作　　者：魏国齐[1] 朱永进 郑剑锋 俞广[1,2] 倪新锋 闫磊 田雷[4] 黄理力[1,2,3] WEI Guoqi;ZHU Yongjin;ZHENG Jianfeng;YU Guang;NI Xinfeng;YAN Lei;TIAN Lei;HUANG Lili(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;PetroChina Hangzhou Research Institute of Geology(HIPG),Hangzhou 310023,China;Key Laboratory of Carbonate Reservoirs,CNPC,Hangzhou 310023,China;Research Institute of Petroleum Exploration&Development-Northwest(NWGI),PetroChina,Lanzhou 730020,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油杭州地质研究院,杭州310023 [3]中国石油天然气集团有限公司碳酸盐岩储层重点实验室,杭州310023 [4]中国石油勘探开发研究院西北分院,兰州730020

出　　处：《石油勘探与开发》2021年第6期1114-1126,共13页Petroleum Exploration and Development

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05004-002);中国石油科技重大专项“残留型海相盆地构造-岩相古地理重建技术研究”(2021DJ0501)。

摘　　要：针对塔里木盆地寒武系盐下领域(上震旦统—中寒武统)源储分布不清的问题,利用最新采集/拼接处理的50余条地震大测线、三维地震数据体、22口钻井与周缘剖面等资料,开展以组为单元的构造-岩相古地理研究,落实规模性源储分布,评价有利勘探区带。结果表明:①该盆地经历了缓坡→深水富泥质缓坡→缓坡→弱镶边-强镶边台地演化序列,台内分异受前寒武系古裂陷控制;②罗南—玉北古裂陷控制下寒武统玉尔吐斯组烃源岩分布,与北部坳陷共同构成主力烃源岩区;③发育上震旦统奇格布拉克组、下寒武统肖尔布拉克组和吾松格尔组3套规模性储集层,古丘滩、早期白云石化及多级不整合控制储集层的发育;④评价出塔中北斜坡、麦盖提上斜坡、柯坪—温宿周缘及塔北南斜坡等4个有利区带,塔中北斜坡为勘探突破最现实领域,塔北南斜坡是探索上震旦统大型风化壳白云岩的最佳领域,麦盖提斜坡及柯坪—温宿周缘勘探潜力得到明显提升,值得加快探索。To predict the large-scale source rock and reservoir distribution in Cambrian subsalt formations(Upper Sinian to Mid-Cambrian)in the Tarim Basin,more than 502D seismic lines and 3D data volume acquired latest,22 wells and some outcrops around this area were used to study the tectonic-lithofacies paleogeography,define the distribution of large scale source rocks and reservoirs,and sort out favorable exploration zones.(1)The basin experienced evolution from ramp to deep-water mud-rich ramp,gentle slope,weak rimmed to strong rimmed platform,and the differentiation in the platform was controlled by pre-Cambrian palaeo-rifts.(2)The Luonan-Yubei ancient rift controlled the distribution of source rocks in the Lower Cambrian Yuertusi Formation,and this rift together with the northern depression are the main source rock area.(3)There are three sets of large-scale reservoirs,the Upper Sinian Qigebulake Formation,the Lower Cambrian Xiaorbulake Formation and the Wusongger Formation,and shoal-mounds,early dolomitization and multi-levels of unconformities controlled reservoir development.(4)Four favorable exploration zones,the north slope of Tazhong,upper slope of Maigaiti area,Keping-Wensu periphery,and south slope of Tabei,were sorted out.Of them,the north slope of Tazhong is most likely to have exploration breakthrough;the south slope of Tabei is the best area for exploring the Upper Sinian large scale weathering crust dolomite;Maigaiti slope and Keping-Wensu periphery area improved in exploration potentials significantly,and are worth prospecting faster.

关 键 词：构造-岩相古地理 成藏组合 勘探区带 晚震旦世—中寒武世 塔里木盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]