石油与天然气地质 ›› 2012, Vol. 33 ›› Issue (5): 743-750.doi: 10.11743/ogg20120511

• 层序与储层 • 上一篇    下一篇

苏里格气田上古生界主要含气层系粘土矿物分布及其主控因素

李明瑞1, 张清2, 段宏臻3, 邓杰4   

  1. 1. 中国石油 长庆油田分公司 勘探部, 陕西 西安 710018;
    2. 中国石油 长庆油田分公司 苏里格气田研究中心, 陕西 西安 710018;
    3. 中国石油 测井有限公司 青海事业部, 甘肃 敦煌 736202;
    4. 中国石油 渤海钻探工程有限公司 第二录井分公司, 河北 任丘 062552
  • 收稿日期:2011-08-16 修回日期:2012-06-13 出版日期:2012-10-28 发布日期:2012-11-15
  • 第一作者简介:李明瑞(1975-),男,博士研究生、高级工程师,天然气地质。

Clay mineral distribution and its controlling factors in the Upper Paleozoic gas reservoirs of Sulige gas field

Li Mingrui1, Zhang Qing2, Duan Hongzhen3, Deng Jie4   

  1. 1. Exploration Department, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710018, China;
    2. Research Center of Sulige Gas Field, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710018, China;
    3. Qinhai Department, PetroChina Logging Company, Dunhuang, Gansu 736202, China;
    4. No.2 Mudlogging Company, CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552, China
  • Received:2011-08-16 Revised:2012-06-13 Online:2012-10-28 Published:2012-11-15

PDF (PC)

1048

被引次数

14

摘要：

鄂尔多斯盆地苏里格气田上古生界主要含气层下石盒子组盒8段及山西组山1段储层中广泛分布粘土矿物,研究不同类型粘土矿物的含量变化及其主控因素对于低渗透储层的改造与保护具有重要作用。利用粘土矿物X-射线衍射、砂岩薄片、铸体薄片等资料综合研究,认为山1段、盒8下亚段、盒8上亚段的粘土矿物类型主要有绿泥石、伊利石、高岭石及伊蒙混层,并利用单因素分析法研究了主要粘土矿物的纵向及平面分布特征,同时对粘土矿物分布差异的主控因素进行了综合分析。研究表明,3个不同物源区的母岩类型决定了粘土矿物的原始成分,温暖潮湿到干旱气候条件的转化影响粘土矿物的风化或蚀变程度,河流沉积环境的强水动力条件、pH值及弱还原环境等为粘土矿物的沉积、转换及保存提供了条件;经历晚成岩阶段B期后长石蚀变导致伊利石增加,储层物性变得更差。

关键词: 粘土矿物, 含气层, 上古生界, 苏里格气田, 鄂尔多斯盆地

Abstract:

Clay minerals distribute widely in the gas reservoirs of the 8th member of the Shihezi Formation and the 1st member of the Shanxi Formation in the Upper Paleozoic of the Sulige gas field in Ordos Basin.The study of clay mineral content changes and main controlling factors plays a very important role in the low-permeability reservoir stimulation and protection.Based on a comprehensive study of data such as X-ray diffraction,thin sections and cast thin sections of clay minerals,and so on,we proved that the clay minerals in the 1st member of Shanxi Formation and the upper and lower 8th member of the Shihezi Formation are mostly chlorite,illite,kaolinite and illite-smectite mixed-layer.The horizontal and vertical distributions of these minerals are studied with the single factor analysis method and the main controlling factors for their distribution difference are also analyzed.The results show that the mother rocks in different provenance regions determined their original composition,climate condition changes from relatively warm and wet to dry controlled their weathering and alteration degrees,and strong hydrodynamics,proper pH value and weak reductive environment of fluvial sedimentary environment provided favorable conditions for their deposition,transformation as well as preservation.However,the increase of illite content from alteration of feldspar during the late diagenetic stage B caused the lowering of reservoir quality.

Key words: clay mineral, gas-bearing layer, Upper Paleozoic, Sulige gas field, Ordos Basin

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