塔里木盆地麦盖提斜坡罗探1井奥陶系断控岩溶新类型油气藏勘探突破及意义  

Exploration breakthrough and significance of the Ordovician fault controlled karst oil and gas reservoir in Well Luotan 1 in Maigaiti slope,Tarim Basin

作　　者：王清华[1] 杨海军[1] 蔡振忠[1] 李勇[1] 杨宪彰[1] 陈才[1] 陈常超 Wang Qinghua;Yang Haijun;Cai Zhenzhong;Li Yong;Yang Xianzhang;Chen Cai;Chen Changchao(PetroChina Tarim Oilfield Company)

机构地区：[1]中国石油塔里木油田公司

出　　处：《中国石油勘探》2024年第2期1-15,共15页China Petroleum Exploration

基　　金：中国石油天然气集团有限公司科技项目“超深层碎屑岩油气分布规律与区带目标优选”(2023ZZ14YJ02)。

摘　　要：塔里木盆地麦盖提斜坡罗探1井在奥陶系碳酸盐岩获得勘探新突破,是麦盖提斜坡奥陶系断控岩溶新类型油气藏的首次勘探突破,标志着斜坡区发现一个重要的战略接替领域。结合区域钻井、测井、地震等资料,开展罗探1等井分析化验资料的综合分析,对麦盖提斜坡奥陶系碳酸盐岩的成藏条件进行再认识。麦盖提斜坡奥陶系碳酸盐岩断控岩溶储层的形成主要与走滑断裂活动相关,是麦盖提斜坡三类主要成储模式之一;麦盖提斜坡目前已发现油气均来自寒武系玉尔吐斯组烃源岩,基底古构造控制了下寒武统的沉积和烃源岩的分布;斜坡区存在加里东期、海西期—印支期和喜马拉雅期3期油气充注成藏过程,烃源岩、古构造演化及通源断裂控制油气复式聚集成藏,断裂活动期次、断穿层系决定了油气富集层系与油气藏性质。麦盖提斜坡奥陶系走滑断裂十分发育,延伸距离累计可达1000km以上,控制了断控岩溶储层和油气藏的分布,平面上具有明显的分区特征,资源规模大、可部署性强,展示出巨大的勘探潜力,是塔西南地区规模油气勘探发现和战略接替的重要现实领域。A new breakthrough has been made in the Ordovician carbonate rocks in Well Luotan 1 in Maigaiti slope,Tarim Basin,marking the first exploration breakthrough of a new type of Ordovician fault controlled karst carbonate oil and gas reservoirs in Maigaiti slope,which is a major strategic replacement field in the slope zone.Combined with the regional well,logging,and seismic data,the laboratory test data of core samples in wells including Luotan 1 is comprehensively analyzed to further understand the hydrocarbon accumulation conditions of the Ordovician carbonate rocks in Maigaiti slope.The study results show that the development of the Ordovician fault controlled karst carbonate reservoirs in Maigaiti slope was mainly related to strike slip fault activity,which was one of the three main reservoir formation modes in Maigaiti slope.The discovered oil and gas in Maigaiti slope were all supplied by source rock in the Cambrian Yuertus Formation,and the paleo basement structure controlled the deposition and distribution of the Lower Cambrian source rock.In the slope zone,three stages of hydrocarbon charging and accumulation occurred in the Caledonian,Hercynian-Indosinian,and Himalayan periods.The composite hydrocarbon accumulation was jointly controlled by source rock,paleo tectonic evolution,and faults connecting source rock,while the hydrocarbon enrichment layers and oil/gas reservoir properties were determined by the stages of fault activity and formations cut faults.The strike slip faults were well developed in the Ordovician in Maigaiti slope,and they controlled the distribution of fault controlled karst carbonate reservoirs and oil and gas reservoirs,with a cumulative extension distance of more than 1000 km,showing clear zoning characteristics on the plane,large resource volume,high feasibility for well deployment,and huge exploration potential,which is a major practical field for discovering large-scale oil and gas reserves and achieving strategic replacement in the southwestern Tarim Basin.

关 键 词：麦盖提斜坡 奥陶系 碳酸盐岩 断控岩溶 成藏条件 勘探潜力 

分 类 号：TE122.1[石油与天然气工程—油气勘探]