天然气地球科学

• 天然气地质学 • 上一篇    下一篇

近源间互式煤系致密砂岩气成藏主控因素——以川中地区须家河组天然气为例

李勇1,陈世加1,2,3,路俊刚1,2,肖正录1,何清波1,苏恺明1,李俊良4   

  1. 1.西南石油大学地球科学与技术学院,四川 成都 610500;
    2.天然气地质四川省重点实验室,四川 成都 610500;
    3.油气藏地质及开发工程国家重点实验室,四川 成都 610500;
    4.川中油气矿区研究所,四川 遂宁 629001
  • 收稿日期:2018-12-20 修回日期:2019-02-15 出版日期:2019-06-10
  • 通讯作者: 陈世加(1964-),男,广东大埔人,教授,博士生导师,主要从事油气成藏、地球化学和石油地质研究.E-mail:chensj1964@swpu.edu.cn.
  • 作者简介:李勇(1993-),男,四川广元人,博士研究生,主要从事油气地球化学和非常规油气地质研究.E-mail:1041257867@qq.com.
  • 基金资助:
    国家自然科学基金(编号:41572137;41502146;41872165);国家科技重大专项(编号:2016ZX05007003-007;2017ZX05001002-003)联合资助

Main controlling factors of near-source and interbedded-accumulation tight sandstone gas from coal-bearing strata:A case study from natural gas of Xujiahe Formation,central Sichuan Basin

Li Yong1,Chen Shi-jia1,2,3,Lu Jun-gang1,2,Xiao Zheng-lu1,He Qing-bo1,Su Kai-ming1,Li Jun-liang4   

  1. 1.School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;
    2.Sichuan Natural Gas Geology Key Laboratories,Chengdu 610500,China;
    3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,China;
    4.Chuanzhong Oil and Gas Company,Southwest Oil and Gas Field Company,PetroChina,Suining 629001,China
  • Received:2018-12-20 Revised:2019-02-15 Online:2019-06-10

摘要: 川中地区须家河组具有大面积含气、充注程度低、局部富集高产及气水关系复杂的特征。为探明川中须家河组天然气成藏特征与成藏主控因素,对该区天然气组分、碳同位素、源岩解析气轻烃、烃源岩分布、储层物性、构造幅度以及异常压力进行综合分析。结果表明:川中地区须家河组天然气为煤成气,具有近源—间互式成藏的特征;烃源岩总累计厚度大,但单层厚度薄,源岩与砂岩互层状分布,生气强度低,天然气充注能力弱;异常高压的发育,为研究区天然气运移提供了充注动力;在气源不足的情况下,天然气会优先充注物性好的砂体,储层物性控制了气藏充注程度;平缓的构造背景下,局部的低幅度构造控制了气藏的分布格局,构造幅度越高,气水分异越充分,越容易形成纯气藏。川中地区须家河组源内砂体具有较好的勘探前景,川西北、川西南地区须三段以及川中西部须五段是源内气藏的有利勘探目标。

关键词: 煤系致密砂岩气, 近源间互式成藏, 源内气藏, 主控因素, 须家河组, 川中地区

Abstract: Xujiahe Formation in central Sichuan Basin is characterized by large-area gas-bearing,low-degree charging,local-enrichment high-yield and complicated water-gas distribution.To verify the characteristics and the main controlling factors of natural-gas accumulation in Xujiahe Formation,comprehensive analyses have been carried out including the component and carbon isotope of natural gas,the light hydrocarbon of source rock adsorbed gas,the distribution of source rock,the physical property of reservoirs,the structural amplitude and the abnormal pressure.The results showed that natural gas in Xujiahe Formation was coal-derived gas featured with near-source and interbedded-accumulation.The source rocks owned large thickness in total but thin layer in single,and they were interbedded with sandstone which had low gas intensity and weak gas charging ability.Abnormal pressure provided charging dynamics for natural gas migration.Natural gas preferred to migrate into good-property sandbodies when gas-source was insufficient and the physical property took control of the charging degree of gas reservoirs.Local low-amplitude structure controlled the distribution pattern of gas reservoirs under slow structural background,and the higher the structure was,the more full the gas-water differentiation would be,and the easier the pure gas reservoir would develop.Overall,sandbodies inside source in Xujiahe Formation had a wonderful exploration prospect,and the northwestern,3rd member in the southwestern and 5th  member in the central of Sichuan Basin were the favorable exploration target of gas reservoirs inside source.

Key words: Tight sandstone gas in coal-bearing strata, Near-source and interbedded-accumulation, Gas reservoirs inside source, Main controlling factors, Xujiahe Formation, central Sichuan Basin

中图分类号: 

  • TE122.2+1
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