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天然气地球科学 ›› 2012, Vol. 23 ›› Issue (4): 673–680.doi: 10.11764/j.issn.1672-1926.2012.04.673

• 天然气地质学 • 上一篇    下一篇

西湖凹陷渐新统花港组储层砂岩成岩环境演化探讨

梁建设，王琪，郝乐伟，唐俊，廖朋，田兵   

  1. 1.中海油研究总院,北京 100027；2.中国科学院油气资源研究重点实验室,甘肃 兰州　730000；
    3.中国科学院研究生院,北京100049；4.内蒙古科技大学数理与生物工程学院,内蒙古 包头 014010
  • 收稿日期:2012-03-18 修回日期:2012-06-24 出版日期:2012-08-10 发布日期:2012-08-10
  • 通讯作者: 梁建设liangjsh@cnooc.com.cn. E-mail:liangjsh@cnooc.com.cn.
  • 作者简介:梁建设(1965-),男,陕西富平人，高级工程师，博士，主要从事海域油气地质研究.E-mail：liangjsh@cnooc.com.cn.
  • 基金资助:

    中国科学院“西部之光”联合学者项目资助.

Evolution of Diagenetic Environments for Oligocene Huagang Formation Sandstone in Xihu Sag

LIANG Jian-she, WANG Qi, HAO Le-wei, TANG Jun, LIAO Peng, TIAN Bing   

  1. 1.CNOOC Research Institute,Beijing 100027,China;
    2.Key Laboratory of Petroleum Resources Research,Chinese Academy of Sciences,Lanzhou 730000,China;
    3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;4.School of Mathematics,Physics
    and Biological Engineering of Inner Mongolia University of Science and Technology,Baotou 014010,China
  • Received:2012-03-18 Revised:2012-06-24 Online:2012-08-10 Published:2012-08-10

PDF (PC)

633

摘要：

通过大量的岩石薄片显微观察，结合其他成岩阶段划分的标志，认为研究区花港组成岩阶段主要处在晚成岩阶段B期;采用光学显微镜、扫描电镜等观察分析东海陆架盆地西湖凹陷花港组储层砂岩自生矿物种类、组合及岩石结构、孔隙类型和结构特征，识别出酸性成岩环境和碱性成岩环境2种类型。酸性成岩环境以长石溶蚀+次生溶孔+自生高岭石+石英次生加大为特征；碱性成岩环境则以石英溶蚀+晚期亚铁碳酸盐充填、交代为特征。酸性和碱性成岩环境演化机理主要受控于烃源岩中干酪根核外围含氧羧基和酚基通过热裂解产生一元和二元水溶性羧酸以及酚类。在中成岩阶段A期，当RO值在0.5％～1.3％之间变化时，有机质通过脱羧基作用生成一元、二元有机酸，并释放出CO2,导致孔隙流体性质为酸性；当烃源岩中有机质演化程度升高,有机酸遭到破坏，脱羧基作用减弱，CO2来源减少,孔隙流体性质逐渐由酸性向碱性演变。

关键词: 西湖凹陷, 花港组, 成岩环境, 有机酸

Abstract:

By means of microscopic observation of a lot of petrographic thin section as well as diagenetic stage of classification signs,we consider that the diagenetic stages of Huagang Formation sandstone in the study area would be at the late diagenetic stage B.We use optical microscopy,scanning electron microscopy,electron microprobe and X-ray to analysis species and composition of authigenic mineral,rock structure,types and structural characteristics of porosity for the Huagang Formation reservoir sandstone in the Xihu sag,East China Sea Shelf basin,and identify acidic and alkaline diagenetic environments.The acidic diagenetic environment is characterized as dissolution of feldspar+secondary stripping holes+kaolinite+quartz characterized by increased secondary and the alkaline diagenetic environments is the dissolution of quartz+advanced filling and metasomatic ferrous carbonate.The main evolution mechanism of acid and alkaline diagenetic environments is controlled by the unary and binary water-soluble acid and phenol which are generated by thermal cracking of oxygen-containing carboxyl and phenol of nuclear periphery kerogen.At middle diagenetic stage A period and RO ranging from 0.5% to 1.3%,the unary and binary organic acid is generated by removing carboxyl from organic matter,associated with CO2 formation which will make pore fluid become acidic.When the thermal maturity of source rock increases,organic acid will be damaged,the action of removing carboxyl become weak and CO2 content decrease,the pore fluid properties change gradually from acidic to alkaline.

Key words: Xihu sag, Huagang Formation, Diagenetic environment, Organic acid

中图分类号: 

  • TE122.2

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