吐哈盆地台北凹陷侏罗系煤系全油气系统特征  

Whole petroleum system in Jurassic coal measures of Taibei Sag in Tuha Basin,NW China

作　　者：支东明 李建忠 杨帆[2] 陈旋 武超 王波 张华 胡军 靳继坤 ZHI Dongming;LI Jianzhong;YANG Fan;CHEN Xuan;WU Chao;WANG Bo;ZHANG Hua;HU Jun;JIN Jikun(PetroChina Tuha Oilfield Company,Hami 839009,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;PetroChina Hanzhou Research Institute of Geology,Hanzhou 310023,China)

机构地区：[1]中国石油吐哈油田公司,新疆哈密839009 [2]中国石油勘探开发研究院,北京100083 [3]中国石油杭州地质研究院,杭州310023

出　　处：《石油勘探与开发》2024年第3期453-466,共14页Petroleum Exploration and Development

基　　金：新疆维吾尔自治区“天山英才”科技创新领军人才支持项目“北疆地区二叠系超级盆地全油气系统地质理论研究与战略接替领域优选”(2022TSYCLJ0070);中国石油天然气集团有限公司攻关性应用性科技专项“深地煤岩气成藏理论与效益开发技术研究”(2023ZZ18)。

摘　　要：基于吐哈盆地中下侏罗统近源勘探最新成果,以全油气系统理念和思路重新认识台北凹陷侏罗系水西沟群烃源岩、储层条件和生储盖组合,深入解析煤系全油气系统。结果表明:(1)水西沟群八道湾组、西山窑组煤系烃源岩和三工河组泥质烃源岩表现为长时间生烃、具有多个生烃高峰和油气兼生的特点,为侏罗系煤系全油气系统提供充足的油气来源;(2)多期浅水辫状河三角洲—浅湖沉积为斜坡区、洼陷区发育常规砂岩、致密砂岩、煤岩、泥页岩等多类型储层,为油气成藏聚集提供多种储集空间;(3)3期油气充注与构造演化、多类型储层有效配置,形成常规-非常规油气序次成藏聚集的特点,从构造高部位到洼陷区发育远源常规构造油气藏、构造-岩性油气藏,近源低饱和度构造-岩性油气藏和源内致密砂岩气聚集、煤岩储层气、页岩油等类型油气聚集。其中,源内致密砂岩气、煤岩气是当前勘探拓展的重点领域,洼陷区页岩油气值得未来探索研究。煤系全油气系统新认识将进一步丰富完善全油气系统地质理论,为吐哈盆地油气资源的整体勘探部署提供新思路。Based on the latest results of near-source exploration in the Middle and Lower Jurassic of the Tuha Basin,a new understanding of the source rocks,reservoir conditions,and source-reservoir-cap rock combinations of the Jurassic Shuixigou Group in the Taibei Sag is established using the concept of the whole petroleum system,and the coal-measure whole petroleum system is analyzed thoroughly.The results are obtained in three aspects.First,the coal-measure source rocks of the Badaowan Formation and Xishanyao Formation and the argillaceous source rocks of the Sangonghe Formation in the Shuixigou Group exhibit the characteristics of long-term hydrocarbon generation,multiple hydrocarbon generation peaks,and simultaneous oil and gas generation,providing sufficient oil and gas sources for the whole petroleum system in the Jurassic coal-bearing basin.Second,multi-phase shallow braided river delta–shallow lacustrine deposits contribute multiple types of reservoirs,e.g.sandstone,tight sandstone,shale and coal rock,in slope and depression areas,providing effective storage space for the petroleum reservoir formation in coal-measure strata.Third,three phases of hydrocarbon charging and structural evolution,as well as effective configuration of multiple types of reservoirs,result in the sequential accumulation of conventional-unconventional hydrocarbons.From high structural positions to depression,there are conventional structural and structural-lithological reservoirs far from the source,low-saturation structural-lithological reservoirs near the source,and tight sandstone gas,coal rock gas and shale oil accumulations within the source.Typically,the tight sandstone gas and coal rock gas are the key options for further exploration,and the shale oil and gas in the depression area is worth of more attention.The new understanding of the whole petroleum system in the coal measures could further enrich and improve the geological theory of the whole petroleum system,and provide new ideas for the overall exploration of oil and gas resou

关 键 词：吐哈盆地 台北凹陷 中下侏罗统 全油气系统 煤系 致密油气 煤岩气 页岩油 

分 类 号：TE122.1[石油与天然气工程—油气勘探]