吐哈盆地胜北洼陷中侏罗统储层流体包裹体特征与油气成藏期次  

Characteristics of Fluid Inclusions in Middle Jurassic Reservoirs and Hydrocarbon Accumulation Period in Shengbei Sag,Turpan-Hami Basin

作　　者：陈淑鹏 蔡苏阳 梁云 胡前泽 程甜 佘家朝 张勇刚 CHEN Shu-peng;CAI Su-yang;LIANG Yun;HU Qian-ze;CHENG Tian;SHE Jia-chao;ZHANG Yong-gang(Key Laboratory of Oil and Gas Resources and Exploration Technology of Ministry of Education,School of Resources and Environment,Yangtze University,Wuhan 430100,China;Turpan Oil Production Plant of PetroChina Tuha Oilfield,Shanshan 838202,China;China Petroleum Hangzhou Institute of Geology,Hangzhou 310023,China)

机构地区：[1]长江大学资源与环境学院,油气资源与勘探技术教育部重点实验室,武汉430100 [2]中国石油吐哈油田分公司,鄯善838202 [3]中国石油杭州地质研究院,杭州310023

出　　处：《科学技术与工程》2022年第36期15913-15924,共12页Science Technology and Engineering

基　　金：国家自然科学基金面上项目(4207030079)。

摘　　要：吐哈盆地胜北洼陷中侏罗统储层油气资源分布广泛,对其流体包裹体特征和成藏期次进行系统研究,有利于油气的精细勘探开发。为厘定胜北洼陷中侏罗统储层油气藏形成和分布规律,基于包裹体岩相学、荧光观测及显微测温技术,分析流体包裹体特征,并结合埋藏史和热史模拟对中侏罗致密砂岩储层油气成藏时间与期次进行研究。结果表明:胜北洼陷中侏罗统储层发育大量烃类包裹体和次生盐水包裹体。其中,油包裹体通常以串珠状成带或成群赋存于石英颗粒愈合裂纹和穿石英颗粒裂纹内,荧光颜色多呈浅黄色和蓝绿,分别指示成熟和高熟油气充注,气包裹体不发荧光;烃类包裹体以及与之共生的盐水包裹体均一温度分布范围较广,呈多幕次分布特征。结合沉积地层埋藏史和热史模拟结果,可见研究区油气成藏主要有两期,早期成藏主要发生在晚侏罗至早白垩世,晚期成藏主要发生在晚第三纪至今,这与基于烃源岩生排烃史及圈闭形成时间所限定的油气成藏时间和期次相一致。研究结果对进一步明确胜北洼陷中侏罗统致密油气勘探有利区具有指导意义。The oil and gas resources of the Middle Jurassic reservoirs in the Shengbei Sag of the Turpan Basin are widely distributed.A detailed analysis of the fluid inclusions and accumulation periods is beneficial to the fine exploration of oil and gas.Using inclusion petrography,fluorescence analysis,and microthermometry,the characteristics of fluid inclusions were analyzed in the Middle Jurassic reservoir of the Shengbei Sag to determine the formation and distribution of oil and gas reservoirs.Furthermore,the period of oil and gas accumulation of the tight sandstone reservoir was also investigated in the Middle Jurassic through burial history simulation and geothermal history simulation.The results show that a large number of hydrocarbon inclusions and secondary brine inclusions are developed in the Middle Jurassic reservoirs of the Shengbei Sag.The oil inclusions are usually beaded in bands or clusters within the healing cracks of quartz grain and through the quartz grain cracks,and their fluorescence color is mostly light yellow and blue-green,indicating mature and highly mature hydrocarbon charging in this region respectively.The gas inclusions do not fluoresce.The homogeneous temperature distribution of hydrocarbon inclusions and their coexisting brine inclusions has a wide range and is characterized by multi-episode distribution.Combing with burial history,geothermal history and thermal maturity history modeling,two accumulation periods are further identified in the Shengbei Sag.The first early period of hydrocarbon accumulation mainly occurred during the Late Jurassic to Early Cretaceous period,and the second late period of hydrocarbon accumulation took place during the Late Tertiary to present.This is consistent with that extracted from the hydrocarbon generation and trap formation.The research results are helpful in refining the sweet spots of tight oil and gas exploration and exploitation in the Middle Jurassic formation of Shengbei Sag,Tuha Basin.

关 键 词：胜北洼陷 致密砂岩储层 流体包裹体 均一温度 油气成藏期次 

分 类 号：P624[天文地球—地质矿产勘探]