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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

煤系致密砂岩气运聚动力与二维可视化物理模拟研究——以川中地区三叠系须家河组致密砂岩气为例

陶士振1，李昌伟1，黄纯虎2，曾溅辉3，张响响1，杨春1，高晓辉1，公言杰1   

  1. 1.中国石油勘探开发研究院，北京 100083；
    2.中国石油西南油气田川中油气勘探开发研究所,四川 遂宁 629000；3.中国石油大学(北京)，北京 102249
  • 收稿日期:2016-03-31 修回日期:2016-06-19 出版日期:2016-10-10 发布日期:2016-10-10
  • 作者简介:陶士振（1966-），男，回族，安徽颍上人，教授级高级工程师，主要从事油气成藏机理与分布评价研究. E-mail:〖WTBZ〗tsz@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项（编号：2008ZX05001-001;2011ZX05001-001）；中国石油科技项目（编号：2014B-0608）联合资助.

Migration and accumulation impetus and two-dimension visual physical simulationresearch of coal-measure tight sandstone gas: A case study from tight sandstone gas in the Upper Triassic Xujiahe Formation,central Sichuan Basin,China

Tao Shi-zhen1，Li Chang-wei1，Huang Chun-hu2，Zeng Jian-hui3，Zhang Xiang-xiang1，Yang Chun1，Gao Xiao-hui1，Gong Yan-jie1   

  1. 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.Research Institute of Oil-gas Exploration and Development Attached to Southwest Oil-gas Field Company,
    PetroChina,Suining 629000,China；3.China University of Petroleum,Beijing 102249,China
  • Received:2016-03-31 Revised:2016-06-19 Online:2016-10-10 Published:2016-10-10

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摘要： 煤系地层致密砂岩气是中国陆相盆地主要的致密砂岩气类型，这种致密砂岩气源来自煤系烃源岩。中国煤系致密砂岩气以四川盆地须家河组和鄂尔多斯盆地上古生界最为典型。煤系烃源岩呈广覆式分布，大面积生排烃，进入大范围砂体后，天然气运移聚集过程中，砂体的非均质性控制了致密砂岩气局部富集和甜点形成。基于典型气区解剖和地质建模，开展了不同粒径砂与黏土相似材料模拟致密砂岩气运聚机理实验研究，以揭示煤系致密砂岩气充注、运移和聚集规律。实验结果表明，砂体渗透率级差控制天然气聚集的有效性、速率和含气饱和度。当砂体渗透率级差值为2.8时，即砂体非均质性较弱时，砂体内天然气不能有效聚集，而是运移和散失；当砂体的非均质性增强，渗透率级差值增加到5.4时，其中的天然气开始聚集成藏；当砂体非均质性进一步增强，渗透率级差值增加到9.0以上时，砂体内天然气发生大规模的有效聚集和成藏。在气源充足的条件下，大面积非均质性砂体中，物性相对越好的局部砂体，且该局部好砂体中均质性和连通性越好，含气饱和度越高。有断层连通的情况下，砂体的成藏速率增大。致密砂岩气运聚机理研究表明，勘探中应找分流河道、岩屑溶蚀相、断层裂缝和局部构造等部位物性较好的砂体，而其外围被物性较差的砂体或泥岩围限，则有利于天然气有效聚集和保存。

关键词: 煤系致密砂岩气, 煤成气, 运聚动力, 二维模拟实验, 渗透率级差, 运聚机理, 三叠系须家河组, 四川盆地

Abstract: Tight sandstone gas derived from coal-measure source rocks is a major type of gases in China continental basin,which is typically characterized by the Xujiahe Formation of the Sichuan Basin and Upper Paleozoic strata of the Ordos Basin.Coal-measure source rocks expelled hydrocarbon evaporatively.Under the setting of gentle structure,the gas migration-accumulation in tight sandstone is featured by restricted hydrodynamic and buoyance.Hydrocarbon source rock of a wide range of planar evaporative hydrocarbon expulsion,the lower tectonic background,the tight sandbody in the process of gas migration accumulation,heterogeneity of sandbodies control the formation of local enrichment and dessert of tight sandstone gas.The two-dimensional simulation experiment reveals that the range of sand permeability controls the efficiency,speed and gas saturation of the gas migration-accumulation.When the range is 2.8 (the sand heterogeneity is weak),gas in sandstone is characterized by migration and dispersion rather than accumulation; as the heterogeneity becomes obvious and the value increases to 5.4,gas accumulation would be triggered; when the range further increases to more than 9,effective gas accumulation occurs in large-scale.When there is adequate gas,the sands with good reservoir property is featured by high gas saturation.Moreover,connected fault enables faster speed of accumulation.In general,the migration-accumulation mechanisms in tight sandstone gas indicate that,exploration should be focused on sands with good reservoir properties within distributary channel,dissolved cuttings,fault fissure,and local structure.The sands periphery is surrounded by sandstone or mudstone with poor reservoir properties,which thus benefits the gas accumulation and preservation.

Key words: Coal-measure tight sandstone gas, Coal-derived gas, Migration and accumulation impetus, Two-dimensional simulation experiment, Permeability contrast-coefficient, Migration-accumulation mechanisms, Triassic Xujiahe Formation, Sichuan Basin

中图分类号: 

  • TE122.1

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