塔西南山前地区柯克亚周缘叶探1井油气勘探重大突破及意义  

Major oil and gas discovery and significance of Well Yetan 1 in the peripheral Kekeya area in the piedmont of the southwestern Tarim Basin

作　　者：王清华[1,2,3] 杨海军 李勇[1,2,3] 蔡振忠 杨宪彰[1,2,3] 谢会文 陈才[1,3,4] 孙春燕 Wang Qinghua;Yang Haijun;Li Yong;Cai Zhenzhong;Yang Xianzhang;Xie Huiwen;Chen Cai;Sun Chunyan(PetroChina Tarim Oilfield Company;CNPC R&D Center of Ultra-Deep Complex Oil and Gas Reservoir Exploration and Development;Xinjiang Engineering Research Center of Ultra-deep Complex Oil and Gas Reservoir Exploration and Development;Xinjiang Key Laboratory of Ultra-deep Oil and Gas)

机构地区：[1]中国石油塔里木油田公司 [2]中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心 [3]新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心 [4]新疆超深油气重点实验室

出　　处：《中国石油勘探》2024年第4期1-16,共16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：塔西南山前西昆仑冲断带柯东构造带叶探1井在二叠系普斯格组获得重大突破,标志着塔西南山前地区发现一个重要的勘探接替层系。结合区域地质资料,根据野外露头、钻井、地震等综合研究,对柯克亚周缘二叠系普斯格组的成藏条件进行再认识。研究认为,研究区内二叠系普斯格组发育陆相湖泊—三角洲沉积体系,上段发育半深湖—深湖相烃源岩,面积1.0×10^(4)km^(2),厚度最大达到800m,集中段有机质丰度为0.92%~1.16%,以菌藻类生源为主,有机质类型主要为Ⅱ型,有机质丰度高;普斯格组下段发育三角洲前缘、滨浅湖沙坝优质砂岩储层,砂体厚度为42.5~63m,砂地比为27%~47%,是一套分布较广的区域性储层,与普斯格组上段泥岩组成优质储盖组合;柯克亚周缘发育印支期、喜马拉雅期两期构造变形,古生界叠瓦冲断、强烈逆掩叠置,圈闭成排成带,喜马拉雅期进一步挤压抬升改造,局部复杂化,形成的叠瓦冲断带为勘探有利区。根据普斯格组天然气干燥系数分析,折算Ro为1.31%~1.42%,与下盘烃源岩成熟度相当,表明油气来自下盘逆掩叠置烃源岩,经历早油晚气的成藏过程,成藏具有“逆掩叠置下盘供烃、下生上储、断裂输导”的特点。综合分析认为该地区二叠系普斯格组圈闭成排成带分布,已发现圈闭9个,面积301km^(2),天然气资源量约为2930×10^(8)m^(3),凝析油资源量约为2×10^(8)t,具有较好的勘探前景。A major breakthrough has been made in the Permian Pusige Formation in Well Yetan 1 in Kedong structural zone in West Kunlun Thrust Belt,marking a major exploration replacement field in the piedmont of the southwest Tarim Basin.Based on regional geological data,field outcrop,well drilling and seismic data,the comprehensive study has been conducted to re understand the hydrocarbon accumulation conditions in the Permian Pusige Formation in the peripheral Kekeya area.The study results show that the continental lacustrine-delta sedimentary system was developed in the Permian Pusige Formation,and the semi-deep to deep lake facies source rock was deposited in the upper member,with an area of 1.0×10^(4) km^(2),a maximum thickness of 800 m,high organic matter abundance of 0.92%-1.16%in the concentration section,mainly bacteria and algae organic matter source,and mainly TypeⅡorganic matter;The high-quality sandstone reservoirs of delta front and shallow shoal lake sand bar facies were developed in the lower member,with sand body thickness of 42.5-63 m and sand to formation ratio of 27%-47%,which served as the regional reservoir with a wide distribution area,and formed high-quality reservoir and cap rock combination with mudstone in the upper member of Pusige Formation;Affected by two stages of tectonic deformation in the peripheral Kekeya area during the Indosinian and Himalayan periods,the imbricated thrusts and strong overthrusts were superimposed in the Paleozoic,forming traps in rows and belts,and the traps were locally complicated by further compression and uplift in the Himalayan period,developing imbricated thrust belts,which are favorable exploration areas.The analysis of natural gas dryness coefficient indicates that Ro is 1.31%-1.42%,which is similar to the maturity of source rock in the foot wall,indicating that the hydrocarbon was supplied by the overthrust and superimposed source rock and experienced hydrocarbon accumulation process of early oil and late gas,with hydrocarbon accumulation characteristics of�

关 键 词：塔西南山前地区 柯克亚周缘 二叠系普斯格组 叶探1井 重大发现 成藏条件 

分 类 号：TE112.1[石油与天然气工程—油气勘探]