石油勘探与开发 >

2016 , Vol. 43 >Issue 4: 550 - 558

DOI: https://doi.org/10.11698/PED.2016.04.06

油气勘探

膏盐岩对地层温度及烃源岩热演化的影响定量分析——以塔里木库车前陆盆地为例

  • 吴海 ,
  • 赵孟军 ,
  • 卓勤功 ,
  • 鲁雪松 ,
  • 桂丽黎 ,
  • 李伟强 ,
  • 徐祖新
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  • 1. 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；
    2. 中国石油勘探开发研究院；
    3. 长江大学地球科学学院
吴海（1989-）,男,湖北黄冈人,硕士,主要从事含油气系统定量分析方面的研究工作。地址：北京市海淀区学院路20号,中国石油勘探开发研究院石油地质实验研究中心,邮政编码：100083。E-mail：wuhai2012@hotmail.com

网络出版日期: 2016-11-02

基金资助

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

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Quantitative analysis of the effect of salt on geothermal temperature and source rock evolution: A case study of Kuqa foreland basin, Western China

  • WU Hai ,
  • ZHAO Mengjun ,
  • ZHUO Qingong ,
  • LU Xuesong ,
  • GUI Lili ,
  • LI Weiqiang ,
  • XU Zuxin
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  • 1. Key Laboratory of Basin Structure and Hydrocarbon Accumulation, CNPC, Beijing 100083, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    3. School of Geosciences, Yangtze University, Wuhan 430100, China

Online published: 2016-11-02

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摘要

库车前陆盆地发育两套巨厚的膏盐岩,依据盆地东西向的二维地震剖面和边界条件,运用瞬态热流法进行模拟,定量分析膏盐岩厚度变化对地温及烃源岩热演化的影响。模拟结果表明：①当盐体总厚度一定时,盐体层数的变化不会对地温场造成影响;②地温随膏盐岩厚度的变化为：西部盐上地温增加0.3~0.6 ℃/100 m,盐下地温减小0.6~1.0 ℃/100 m;东部盐上地温增加1.9~2.3 ℃/100 m,盐下地温减小0.2~2.6 ℃/100 m;③镜质体反射率Ro随膏盐岩厚度的变化为：西部平均滞后约0.02%/100 m,东部平均滞后约0.05%/100 m。膏盐岩本身的热导率与温度呈负相关关系,东部盐体埋藏较浅,地温相对较低,其总体热导率较高,导致地温和Ro值变化率比西部高。相对于泥岩,膏盐岩使下伏烃源岩热演化滞后,导致库车东部迪那2凝析气田油气充注时间滞后7.5~9.0 Ma,使得其排烃充注时期与圈闭形成时期相匹配,有利于该地区的晚期成藏。图11参35

关键词： 膏盐岩; 热导率; 地层温度; 烃源岩; 热演化程度; 盆地模拟; 库车前陆盆地; 塔里木盆地

本文引用格式

吴海 , 赵孟军 , 卓勤功 , 鲁雪松 , 桂丽黎 , 李伟强 , 徐祖新 . 膏盐岩对地层温度及烃源岩热演化的影响定量分析——以塔里木库车前陆盆地为例[J]. 石油勘探与开发, 2016 , 43(4) : 550 -558 . DOI: 10.11698/PED.2016.04.06

Abstract

There develop two sets of thick salt in the Kuqa foreland basin, the impact of salt thickness on geothermal temperature and thermal evolution of source rock was analyzed using transient thermal modeling method based on the two dimensional seismic profile from west to east of the basin and the related boundary condition. The results indicate that: (1) the change of salt plies will not have different impact on geothermal temperature when the total thickness of the salt body is constant; (2) the geothermal temperature of formations above the gypsum will increase about 0.3-0.6 ℃/100 m, while the subsalt geothermal temperature will decrease about 0.6-1.0 ℃/100 m in the west of the basin; the geothermal temperature of formations above the salt will increase about 1.9-2.3 ℃/100 m, while the subsalt geothermal temperature will decrease about 0.2-2.6 ℃/100 m in the east of the basin; (3) the value of vitrinite reflectance will be lagged about 0.02%/100 m averagely in the west of the basin, and will be lagged about 0.05%/100 m in the east. As the thermal conductivity of gypsum-salt rock is negatively correlated with temperature, the salt body in the east has a shallower burial and lower geothermal temperature, so its overall thermal conductivity is higher, causing the changing rates of geothermal temperature and Ro are higher than the west. A case study of Dina 2 condensate field of Kuqa foreland basin indicates that the charge time of hydrocarbon there lagged about 7.5-9.0 Ma because of the delayed source rock thermal evolution caused by the salt, matching well with the formation period of trap, which is favorable for the late accumulation of hydrocarbon in this area.

Key words： salt; conductivity; geothermal temperature; source rock; thermal evolution; basin modeling; Kuqa foreland basin; Tarim Basin

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