库车前陆盆地东西部油气成藏过程差异性分析——以吐北1和迪那2构造为例

吴海, 严少怀, 赵孟军, 卓勤功, 王龙, 白东来, 张月, 沙威

doi:10.11764/j.issn.1672-1926.2019.04.001

天然气地球科学 >

2019 , Vol. 30 >Issue 7: 1027 - 1036

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.04.001

天然气地质学

库车前陆盆地东西部油气成藏过程差异性分析——以吐北1和迪那2构造为例

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1.中国石油勘探开发研究院，北京 100083；
2.中国石油大庆头台油田开发有限责任公司，黑龙江大庆 166512；
3.中国地质大学(北京)，地球科学与资源学院，北京 100083；
4.中国石油大学(北京)，地球科学学院，北京 102249；
5.中国石油青海油田公司勘探开发研究院，甘肃敦煌 736202

吴海(1989-)，男，湖北黄冈人，工程师，博士，主要从事含油气系统分析与油气成藏研究.E-mail：wuhai2012@hotmail.com.

收稿日期: 2019-01-20

修回日期: 2019-04-01

网络出版日期: 2019-08-07

基金资助

国家科技重大专项课题“前陆冲断带及复杂构造区油气成藏、分布规律与有利区评价”(编号：2016ZX05003-002)；中国石油天然气股份有限公司科学研究与技术开发项目“前陆盆地源储配置与断—盖组合定量评价技术”(编号：2016B-0502)联合资助.

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Analysis of the difference in the hydrocarbon accumulation process between eastern and western parts of Kuqa foreland basin：Case study of Tubei 1 structure and Dina 2 structure

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1.Research Institute of Petroleum Exploration & Development，PetroChina，Beijing 100083，China；
2.Toutai Oilfield Development Company Limited，Daqing Oilfield Company，PetroChina，Daqing 166512，China；
3.School of Earth Sciences and Resources，China University of Geosciences，Beijing 100083，China；
4.College of Geosciences，China University of Petroleum，Beijing 102249，China；
5.Research Institute of Exploration and Development of Qinghai Oilfield，CNPC，Dunhuang 736202，China

Wu Hai(1989-), Male, Engineer, Ph.D, Mainly engaged in petroleum system analysis and hydrocarbon accumulation research. E-mail：wuhai2012@hotmail.com.

Received date: 2019-01-20

Revised date: 2019-04-01

Online published: 2019-08-07

Supported by

Supported by the China National Science and Technology Major Project “Hydrocarbon accumulation distribution rule and favorable area evaluation in foreland thrust belt and complex structure area” (Grant No. 2016ZX05003-002); the Scientific Research and Technology Development Project of CNPC “Fracture-cap combination quantitative evaluation technique and source storage configuration in foreland basin” (Grant No. 2016B-0502).

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摘要

库车前陆盆地油气演化历史复杂，呈现多期生烃、多期运聚、破坏和调整并举、区带成藏具明显差异性等特点。由于分区对比研究较少，制约了对区带差异性油气分布规律的认识。因此，对库车前陆盆地东部和西部典型含油气构造进行对比分析，结合定量荧光、流体包裹体和油气运聚数值模拟等技术，系统地对比了库车前陆盆地东西部油气成藏过程差异性。①盆地西部聚集的轻质油组分以三环芳烃和四环芳烃为主，东部以四环芳烃为主，且部分储层段含有早期残余重质组分。②成藏过程具有“早油晚气，晚期规模成藏”特点，西部早期原油充注时间为15Ma左右，东部约为10Ma，西部烃源岩热演化明显高于东部。晚期西部成藏时间为3Ma左右，东部约为2.5Ma，强烈隆升的圈闭捕获了大规模的天然气和轻质油，成藏具有快速高效特点。③西部由于早期丧失了盖层的完整性导致原油散失，主要聚集晚期的天然气和少量轻质原油，东部继承性圈闭很好地聚集了2期油气充注。晚期，东部由于地层的翘倾导致油气向盐体上倾方向或浅部地层调整，形成次生油气藏或逸散。

关键词： 库车前陆盆地; 烃源岩; 包裹体; 定量颗粒荧光; 盆地模拟; 油气运移; PetroMod

本文引用格式

吴海, 严少怀, 赵孟军, 卓勤功, 王龙, 白东来, 张月, 沙威 . 库车前陆盆地东西部油气成藏过程差异性分析——以吐北1和迪那2构造为例[J]. 天然气地球科学, 2019 , 30(7) : 1027 -1036 . DOI: 10.11764/j.issn.1672-1926.2019.04.001

Abstract

It has multi-phase hydrocarbon generation and expulsion，migration and accumulation，adjustment and destruction in Kuqa foreland basin，and the reservoir forming process is complex and varies from region to region.There are few regional comparative studies，which restrict the understanding of region difference of hydrocarbon distribution.Two typical hydrocarbon bearing structure from east to west of Kuqa foreland basin were selected to make comparative analysis，by combining quantitative fluorescence technique，fluid inclusion analytical technique and 2D basin modelling technique.The difference of hydrocarbon accumulation process in the Kuqa foreland basin were systematically compared.The result indicated：(1)The component of light oil accumulated in the west was dominated by tricyclic and tetracyclic aromatics，while the east was dominated by tetracyclic aromatics.Some of the reservoir sections in the east contain residual heavy components from the early crude oil proved by QGF-E and TSF data.(2)The hydrocarbon charge process is characterized by “early oil，late gas，and the gas charge is the most significant”.The early oil charge time was about 15Ma in the west，10Ma in the east，and the thermal evolution of source rock is higher in the west than in the east.About 3Ma ago in the west and 2.5Ma ago in the east，the source rock entered gas generation stage.The trap uplifted sharply during the Himalayan orogeny，and the gas accumulated in the trap quickly and efficiently.(3)In the first stage，the migration pathway of hydrocarbon was vertically upward and then laterally upward when reaching the salt bottom，the fault cut through the salt seal in the shallow burial，causing the leakage of the early oil.In the second stage，the trap in the west kept uplifting，while the east inclined causing the hydrocarbon to migrate to the updip direction and accumulate in the flank area of salt，shallow reservoir or seeping to the earth surface.

Key words： Kuqa foreland basin; Source rock; Fluid inclusion; Quantitative grain fluorescence; Basin modelling; Hydrocarbon migration; PetroMod

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