石油勘探与开发 >

2017 , Vol. 44 >Issue 4: 549 - 560

DOI: https://doi.org/10.11698/PED.2017.04.08

油气勘探

天然气运移有机-无机地球化学示踪指标——以四川盆地川西坳陷侏罗系气藏为例

  • 叶素娟 ,
  • 朱宏权 ,
  • 李嵘 ,
  • 杨映涛 ,
  • 黎青
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  • 1. 中国石化西南油气分公司勘探开发研究院,成都 610041;
    2. 中国地质调查局成都地质调查中心,成都 610081
叶素娟（1969-）,女,浙江温州人,博士,中国石化西南油气分公司勘探开发研究院高级工程师,主要从事储集层地质及油气成藏方面研究。地址：四川省成都市高新区（南区）吉泰路688号,中国石化西南科研基地勘探开发研究院,邮政编码：610041。E-mail：sujuan_ye@hotmail.com 联系作者简介：李嵘（1967-）,男,云南昆明人,中国地质调查局成都地质调查中心（国土资源部成都地质矿产研究所）教授级高级工程师,主要从事沉积与储集层地质方面研究。地址：四川省成都市一环路北三段2号,成都地质矿产研究所,邮政编码：610081。E-mail：goest33@sina.com

修回日期: 2016-05-20

  网络出版日期: 2017-07-27

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Tracing natural gas migration by integrating organic and inorganic geochemical data: A case study of the Jurassic gas fields in western Sichuan Basin, SW China

  • YE Sujuan1 ,
  • ZHU Hongquan1 ,
  • LI Rong2 ,
  • YANG Yingtao1 ,
  • LI Qing1
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  • 1. Exploration and Production Research Institute, Sinopec Southwest Oil & Gas Company, Chengdu 610041, China;
    2. Chengdu Center, China Geological Survey, Chengdu 610081, China

Revised date: 2016-05-20

  Online published: 2017-07-27

Supported by

国家科技重大专项“四川盆地碎屑岩层系油气富集规律与勘探评价”（2016ZX05002-004）

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摘要

以四川盆地川西坳陷侏罗系气藏作为研究实例,通过分析天然气组分和碳同位素组成特征,结合地层水化学特征、储集层中自生矿物碳、氧同位素组成以及流体包裹体特征,提出了C1/C2值、N2含量、芳烃/烷烃值、甲烷碳同位素组成、地层水矿化度及水化学特征参数、储集层中自生方解石碳氧同位素组成、含烃盐水包裹体均一温度及盐度等指示天然气运移相态、运移方向和运移路径的有机-无机地球化学示踪指标,并对天然气的运移过程及机制进行了探讨。研究表明,川西坳陷中侏罗统天然气以水溶相运移为主,随着运移脱溶过程的进行表现出苯/烷烃值增大、甲烷碳同位素组成变重的趋势,同时具有气藏伴生地层水矿化度较低、含气砂岩中自生方解石的碳氧同位素组成偏轻、含烃盐水包裹体均一温度高且盐度较低等特征;上侏罗统天然气则以游离相运移为主。结合区域地质以及水溶气脱溶成藏过程中的相态演化等方面的研究,证明提出的有机-无机地球化学示踪指标可对川西坳陷侏罗系天然气的运移方向及路径进行有效的判识。图9表4参30

关键词： 四川盆地; 川西坳陷; 侏罗系; 天然气; 运移示踪指标; 地层水; 同位素组成

本文引用格式

叶素娟 , 朱宏权 , 李嵘 , 杨映涛 , 黎青 . 天然气运移有机-无机地球化学示踪指标——以四川盆地川西坳陷侏罗系气藏为例[J]. 石油勘探与开发, 2017 , 44(4) : 549 -560 . DOI: 10.11698/PED.2017.04.08

Abstract

Based on the integrated geochemical and isotopic analysis of natural gases, formation waters, authigenic minerals, and fluid inclusions, a set of organic and inorganic geochemical tracing parameters, including methane/ethane ratio (C1/C2), N2 content, arene/alkane ratio, carbon isotope of methane (δ13C1), total dissolved solids (TDS) and chemistry of formation water, oxygen and carbon isotopic composition of authigenic calcite cement (δ18Ocalcite and δ13Ccalcite), and homogenization temperature and salinity of hydrocarbon- bearing brine inclusions, have been proposed to indicate the phase, direction, and pathway of natural gas migration and to discuss the migration processes and mechanisms of the Jurassic hydrocarbon in western Sichuan. This study results reveal that the Middle Jurassic gas in western Sichuan depression mainly migrated in water-dissolving phase and had the characteristics of increase of arene/alkane ratio and δ13C1, decrease of TDS, light δ18Ocalcite and δ13Ccalcite in gas-bearing sands, and high homogenization temperature and low salinity of hydrocarbon-bearing brine inclusions, while the Upper Jurassic gas primarily migrated in free gas phase. Additionally, it is demonstrated that the migration directions and pathways of the Jurassic gases in western Sichuan can be investigated effectively by applying multiple organic and inorganic geochemical tracing parameters, in combination with the study results of geological setting and phase state evolution of water-dissolved gases during desolubilization and accumulation.

Key words： Sichuan Basin; western Sichuan depression; Jurassic; natural gas; migration tracing parameters; formation water; isotopic composition

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