库车前陆盆地吐北2构造油气充注过程分析

吴海, 赵孟军, 白东来, 周延钊, 周彦臣

doi:10.11764/j.issn.1672-1926.2016.04.0600

天然气地球科学 >

2016 , Vol. 27 >Issue 4: 600 - 608

DOI: https://doi.org/10.11764/j.issn.1672-1926.2016.04.0600

天然气地质学

库车前陆盆地吐北2构造油气充注过程分析

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1.中国石油勘探开发研究院，北京100083；
2.中国石油天然气集团公司盆地构造与油气成藏重点实验室，北京100083；
3.东北石油大学地球科学学院，黑龙江大庆 163318；
4.中国石油大学地球科学与技术学院，山东青岛 266580；
5.长江大学地球科学学院，湖北武汉 430100

吴海(1989-)，男，湖北黄冈人，硕士研究生，主要从事含油气系统定量分析研究. E-mail:wuhai2012@hotmail.com.

收稿日期: 2015-05-12

修回日期: 2015-08-17

网络出版日期: 2019-09-20

基金资助

国家油气重大专项(编号：2016ZX05003-002)；中国石油科技开发项目(编号：2016B-0502)联合资助.

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Hydrocarbon charge process analysis of Tubei 2 structure in Kuqa foreland basin,western China

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1.Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;
2.Key Laboratory of Basin Structure and Hydrocarbon Accumulation,CNPC,Beijing 100083,China;
3.College of Geosciences,Northeast Petroleum University,Daqing 163318,China;
4.School of Geosciences,China University of Petroleum,Qingdao 266580,China;
5.School of Geosciences,Yangtze University,Wuhan 430100,China

Received date: 2015-05-12

Revised date: 2015-08-17

Online published: 2019-09-20

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摘要

基于定量颗粒荧光、流体包裹体等技术，结合埋藏史、热史及生烃史对库车前陆盆地吐北2构造的油气充注史进行分析。分析结果表明，储层的QGF指数均大于5，表示测点的深度层段均为古油层段；而大部分层段的QGF-E强度都大于20pc，显示出残余油层的特点；TSF显示油质成分单一，说明现今储层烃类具有同源的特点。结合流体包裹体及储层沥青分析表明吐北2构造经历了3期油气充注：中新世康村组晚期(11～6Ma)经历了成熟油气的充注，包裹体显示出黄色、黄白色的荧光，由于后期断层穿盐导致古油藏破坏形成储层沥青；随着埋深加大，膏盐岩发生强烈的塑性流动使断裂愈合，同时伴随着轻质油的充注(4.5~2Ma)，对应的包裹体显示出蓝色的荧光；上新世库车组末期(2.5Ma)储层又经历一期高过成熟气的充注，与第二期轻质油充注连续无间断。由于研究区白垩系储层普遍发育泥岩隔层，导致部分层段现今仍存在残余油层。

关键词： 库车前陆盆地; 吐北2; 定量颗粒荧光; 流体包裹体; 油气充注过程

本文引用格式

吴海, 赵孟军, 白东来, 周延钊, 周彦臣 . 库车前陆盆地吐北2构造油气充注过程分析[J]. 天然气地球科学, 2016 , 27(4) : 600 -608 . DOI: 10.11764/j.issn.1672-1926.2016.04.0600

Abstract

The hydrocarbon charge process of Tubei 2 structure in Kuqa foreland basin was unraveled by the analysis of quantitative fluorescence,fluid inclusion,trap development history,geothermal history,burial and evolution histories.The result shows that the QGF index of the samples in the reservoir are all larger than 5,showing the characteristic of paleo-oil zone.The QGF-E intensity of most formation in Well Tubei 2 is larger than 20pc which means it is the residual oil zone.TSF showsthe hydrocarbon nowadays in the reservoir is not mixed source.By combining palaeo-fluid evidence and reservoir bitumen analysis,it is believed that Tubei 2 structure has experienced three stages of hydrocarbon charges.In the first stage,the matured oil was charged in Late Miocene(11-6Ma)and the fluorescence color of the related fluid inclusions is yellow,after that the fault cut through the salt seal which led to the escape of the hydrocarbon and left some bitumen in the reservoir.The salt transferred into plastic with deeper burial which led to the regaining of sealing ability.In the second stage(4.5-2Ma),the reservoir experienced the charge of light oil and condensate,the related fluid inclusions color is blue.In the third stage(2.5Ma),the reservoir experienced the charge of gas following the second stage without interruption.There is still some residual liquid oil in some strata nowadays mainly because of the presence of shale interlayer.

Key words： Kuqa foreland basin; Tubei 2; Quantitative grain fluorescence; Fluid inclusion; Hydrocarbon charge history

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