油气勘探

塔里木盆地跃参地区YJ1X井超深层油藏演化

  • 杨鹏 ,
  • 刘可禹 ,
  • LI Zhen ,
  • MCINNES Brent Ian Alexander ,
  • 刘建良
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  • 1.中国石油大学(华东)深层油气重点实验室,山东青岛 266580;
    2.海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071;
    3.John de Laeter Centre,Faculty of Science and Engineering,Curtin University,Perth WA 6485,Australia
杨鹏(1990-),男,山东济宁人,中国石油大学(华东)地球科学与技术学院在读博士研究生,主要从事流体包裹体及油气成藏研究。地址:山东省青岛市黄岛区长江西路66号,中国石油大学工科楼C座,邮政编码:266580。E-mail:yangpeng_upc@163.com

收稿日期: 2021-06-20

  网络出版日期: 2022-03-16

基金资助

国家深地重点研发项目“塔里木盆地盐下超深层大型油气田形成机理与分布预测”(2019YFC0605500); 中国科学院A类战略性先导科技专项“智能导钻技术装备体系与相关理论研究”(XDA14010401); 国家自然科学基金委油气成藏机理创新研究群体(41821002)

Evolution of Ordovician YJ1X ultra-deep oil reservoir in the Yuecan oilfield, Tarim Basin, NW China

  • YANG Peng ,
  • LIU Keyu ,
  • LI Zhen ,
  • MCINNES Brent Ian Alexander ,
  • LIU Jianliang
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  • 1. Key Laboratory of Deep Oil and Gas, China University of Petroleum, Qingdao 266580, China;
    2. Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
    3. John de Laeter Centre, Faculty of Science and Engineering, Curtin University, Perth, WA 6485, Australia

Received date: 2021-06-20

  Online published: 2022-03-16

摘要

基于原位方解石U-Pb定年、原油与储集岩烃类地球化学特征对比以及流体包裹体分析,恢复塔里木盆地塔北隆起西南部跃参地区YJ1X井奥陶系一间房组超深层油藏的充注与演化过程。研究结果表明:①原油、游离油以及包裹体油具有相似的地球化学特征,其对应的烃源岩在相同的沉积环境中形成;②原油、游离油以及包裹体油具有相似的成熟度,计算得到的等效镜质体反射率值为0.80%~0.96%;③储集层中识别出两种不同类型的油包裹体组合,其中Ⅰ类代表充注过程中最初进入圈闭、气体相对饱和的原油,Ⅱ类代表油藏发生轻微轻烃泄漏后残留的欠饱和原油;④该油藏在距今约425 Ma的早泥盆世发生过1期油充注,尽管在中泥盆世发生过部分轻烃泄漏,但之后一直保存完好。该研究表明在盖层发育良好、构造相对稳定的含油气盆地超深层中存在潜在的古老油气藏,可为下步的超深层油气勘探提供借鉴。

本文引用格式

杨鹏 , 刘可禹 , LI Zhen , MCINNES Brent Ian Alexander , 刘建良 . 塔里木盆地跃参地区YJ1X井超深层油藏演化[J]. 石油勘探与开发, 2022 , 49(2) : 262 -273 . DOI: 10.11698/PED.2022.02.05

Abstract

Based on a combined in-situ calcite U-Pb dating, molecular geochemical correlations of reservoir oil and extract from reservoir rocks and fluid inclusion analysis, the charge and evolution history of the YJ1X ultra-deep oil reservoir of Ordovician Yijianfang Formation in the southwestern part of the Tabei Uplift has been determined systematically. (1) The reservoir oil, free oil and inclusion oil have similar geochemical characteristics and are presumably derived from marine source rock deposited in similar sedimentary environment. (2) The reservoir oil, free oil and inclusion oil have similar maturities with calculated equivalent vitrinite reflectance values in the range of 0.80%?0.96%. (3) Two types (Ⅰ and Ⅱ) of oil inclusion assemblages (OIAs) have been identified in the reservoir, of which the type Ⅰ represents the original gas-saturated oil entering the trap during the initial oil charge, whereas the type Ⅱ represents undersaturated residual oil retained in the reservoir after minor leakage of light hydrocarbon. (4) The reservoir experienced oil charge only once during the Early Devonian around 425 Ma and has been well preserved after the minor light hydrocarbon leakage in the Middle Devonian. The study shows that there may be old oil and gas accumulations in ultra-deep strata of petroliferous basins with well-developed caprock and stable tectonic background.

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