岩性油气藏 ›› 2023, Vol. 35 ›› Issue (2): 94–102.doi: 10.12108/yxyqc.20230209

• 地质勘探 • 上一篇    下一篇

柴达木盆地英雄岭地区古近系油气成藏过程及其演化特征

完颜泽1, 龙国徽2,3, 杨巍4, 柴京超3, 马新民4, 唐丽3, 赵健3, 李海鹏3   

  1. 1. 中国石油勘探开发研究院, 北京 100083;
    2. 中国地质大学 (北京), 北京 100083;
    3. 中国石油青海油田公司, 甘肃 敦煌 736202;
    4. 中国石油勘探开发研究院 西北分院, 兰州 730020
  • 收稿日期:2022-05-26 修回日期:2022-07-18 出版日期:2023-03-01 发布日期:2023-03-07
  • 第一作者:完颜泽(1997-),中国石油勘探开发研究院在读硕士研究生,研究方向为国内外油气战略评价和油气田开发研究。地址:(100083)北京市海淀区学院路20号中国石油勘探开发研究院。Email:wanyanze@petrochina.com.cn。
  • 通信作者: 龙国徽(1986-),男,硕士,高级工程师,主要从事油气勘探综合研究与科研管理工作。Email:longgwqh@petrochina.com.cn。
  • 基金资助:
    国家自然科学基金青年基金“富含有机质泥岩盖层生排烃后封闭性变化”（编号：42002180）、中国石油天然气股份有限公司直属院所基金“柴达木盆地新近系烃源岩生烃产生有机酸对湖相碳酸盐岩的改造作用”（编号：2020D-5008-05）及中国石油天然气股份有限公司重大科技项目“深层超深层地质结构与构造样式研究”（编号：2021DJ0201）联合资助。

Hydrocarbon accumulation and evolution characteristics of Paleogene in Yingxiongling area, Qaidam Basin

WANYAN Ze1, LONG Guohui2,3, YANG Wei4, CHAI Jingchao3, MA Xinmin4, TANG Li3, ZHAO Jian3, LI Haipeng3   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. China University of Geosciences(Beijing), Beijing 100083, China;
    3. PetroChina Qinghai Oilfield Company, Dunhuang 736202, Dunhuang, China;
    4. PetroChina Research Institute of Petroleum Exploration and Development-Northwest(NWGI), Lanzhou 730020, China
  • Received:2022-05-26 Revised:2022-07-18 Online:2023-03-01 Published:2023-03-07

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摘要： 通过构造演化特征研究，结合烃类包裹体分析和典型油气藏精细解剖，阐述了柴达木盆地英雄岭地区古近系下干柴沟组上段油气藏的形成和演化过程。研究结果表明： ①英雄岭地区古近系下干柴沟组上段形成于半咸化—咸化湖泊—盐湖环境，发育以纹层状灰云岩为储集层、富含有机质、广覆式分布的源储一体型油气藏；②研究区下干柴沟组上段共经历3期油气充注，第Ⅰ期烃类包裹体为单一液相油包裹体，反映了早期低熟原油的运移和充注；第Ⅱ期烃类包裹体为单一液相油包裹体，反映了一幕中等成熟原油的运移和充注；第Ⅲ期烃类包裹体为气液两相油包裹体，反映了一幕高成熟原油的充注。③研究区油气具有3期成藏的特征：上干柴沟组沉积中晚期，在下干柴沟组上段形成了低饱和度-低熟油藏；上油砂山组沉积期，低熟—成熟油气向盐间储集层和高渗带聚集形成了油气高产区；狮子沟组—七个泉组沉积期，成熟—高熟油通过双层断裂接力输导运移至干柴沟组上段及以上地层运聚形成构造油气藏。

关键词: 咸化湖泊, 纹层状灰云岩, 晶间孔, 高渗带, 页岩油, 低熟烃源岩, 下干柴沟组上段, 古近系, 英雄岭地区, 柴达木盆地

Abstract: Through the study of structural evolution characteristics, combined with the analysis of hydrocarbon inclusions and fine dissection of typical oil and gas reservoirs, the formation and evolution process of oil and gas reservoirs in the upper member of Paleogene Xiaganchaigou Formation in Yingxiongling area of Qaidam Basin were analyzed. The results show that:(1) The upper member of Xiaganchaigou Formation in Yingxiongling area experienced a semi saline lake, saline lake and salt lake environment during the Paleogene period, and formed a large area of source-reservoir type oil and gas reservoir dominated by laminated calcite dolomite which is rich in organic matters.(2) The upper member of Xiaganchaigou Formation in the study area has experienced three stages of oil and gas filling. The hydrocarbon inclusions in the first stage are single liquid oil inclusions, reflecting the migration and filling of early low mature crude oil. The hydrocarbon inclusions in the second stage are single liquid oil inclusions, which reflects the migration and filling of medium mature crude oil. The hydrocarbon inclusions in the third stage are gas-liquid two-phase oil inclusions, reflecting an episode of filling of highly mature crude oil.(3) The oil and gas in the study area are characterized by three stages of accumulation. In the middle and late stages of the deposition of Shangganchaigou Formation, reservoirs with low saturation and low maturity formed in the upper member of Xiaganchaigou Formation. In the sedimentary period of Shangyoushashan Formation, low mature to mature oil and gas accumulated to the salt reservoirs and high permeable zones, forming a high oil and gas production area. During the sedimentation period of Shizigou Formation to Qigequan Formation, maturehighly mature oil migrated to the upper member of Ganchaigou Formation and above through the transport of double layer faults to form structural oil and gas reservoirs.

Key words: saline lake, laminated calcite dolomite, intercrystalline pore, high permeable zone, shale oil, low mature source rock, upper member of Xiaganchaigou Formation, Paleogene, Yingxiongling area, Qaidam Basin

中图分类号: 

  • TE122.1
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