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首页> 外文期刊>Energy & fuels >Types, Evolution of Fractures, and Their Relationship with Oil and Gas Migration of Permian Changxing Formation in Yuanba Gas Field of Sichuan Basin, China
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Types, Evolution of Fractures, and Their Relationship with Oil and Gas Migration of Permian Changxing Formation in Yuanba Gas Field of Sichuan Basin, China

机译：四川盆地元坝气田二叠系长兴组裂缝类型，演化与油气运移关系

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摘要

Yuanba gas field of Sichuan Basin is characterized by weak-tectonic deformation, and the fractures have had a significant effect on oil and gas migration. This paper investigates the types, evolution of fractures, and their relationship with oil and gas migration of the Permian Changxing Formation of the Yuanba gas field according to geological and geochemical analyses. Four genetic types of fractures with different occurrences were distinguished: intercrystal fractures, pressure solution fractures (stylolites), structural fractures, and overpressure fractures. Intercrystal fractures present multiple straight edges between the dolomite particles and no fixed direction. Pressure solution fractures are in the form of zigzags. Structural fractures have straight edges and a certain direction and are usually distributed in groups. Overpressure fractures have irregular shapes and irregular directions and occur in multiple quantity. According to the comprehensive analyses, the intercrystal fractures, pressure solution fractures, and structural fractures formed in shallow-intermediate burial environments during the Early Yanshanian period and acted as paleo-oil migration pathways; thus, paleo-oil is widely distributed in the Permian Changxing Formation reservoir, as indicated by the presence of pyrobitumen. The overpressure and structural fractures formed in deep burial environments during the Late Yanshanian and Himalayan periods and served as the dominant pathways for the migration and remigration of cracked gas. This study is significant for understanding the formation of oil and gas fields in the weak-tectonic deformation zone.
机译：四川盆地元坝气田的构造变形较弱，裂缝对油气运移具有显着影响。本文通过地质和地球化学分析，研究了元坝气田二叠系长兴组裂缝的类型，演化及其与油气运移的关系。区分了四种不同发生类型的裂缝的遗传类型：晶体间裂缝，压力溶液裂缝（铁斜晶石），结构裂缝和超压裂缝。晶间裂缝在白云石颗粒之间存在多个直边，并且没有固定的方向。压力溶液裂缝呈锯齿形。结构性裂缝具有直的边缘和一定的方向，通常成组分布。过压裂缝具有不规则的形状和不规则的方向，并多次发生。综合分析认为，燕山期初在浅中埋环境中形成了晶间裂缝，压溶裂缝和构造裂缝，是古油运移的通道。因此，正如火山岩的存在所表明的，古石油广泛分布在二叠纪长兴组储层中。燕山晚期和喜马拉雅时期的深埋环境中形成了超压和构造裂缝，是裂隙气运移的主要途径。这项研究对于了解弱构造变形带油气田的形成具有重要意义。

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  • 来源
    《Energy & fuels》 |2017年第9期|9345-9355|共11页
  • 作者

    Liu Jingdong; Liu Guangxiang;

  • 作者单位

    China Univ Petr, Sch Geosci, Qingdao 266580, Peoples R China|China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China|SINOPEC, Res Inst Petr Explorat & Prod, Wuxi Res Inst Petr Geol, Wuxi 214162, Peoples R China;

    SINOPEC, Res Inst Petr Explorat & Prod, Wuxi Res Inst Petr Geol, Wuxi 214162, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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