石油与天然气地质 ›› 2009, Vol. 30 ›› Issue (1): 53-58.doi: 10.11743/ogg20090108

• 石油地质理论 • 上一篇    下一篇

绿泥石环边胶结物对致密砂岩孔隙的保存机制—以川中-川南过渡带包界地区须家河组储层为例

刘金库1, 彭军2, 刘建军3, 汪彦1, 刘建锋1   

  1. 1. 西南石油大学, 研究生院, 四川, 成都, 610500;
    2. 西南石油大学, 科研处, 四川, 成都, 610500;
    3. 中国石油化工股份有限公司, 西北分公司, 新疆, 乌鲁木齐, 830011
  • 收稿日期:2008-10-13 出版日期:2009-02-25 发布日期:2012-01-16
  • 基金项目:

    四川省教育厅自然科学重点项目(07ZA139)

Pore-preserving mechanism of chlorite rims in tight sandstone—an example from the T3x Formation of Baojie area in the transitional zone from the central to southern Sichuan Basin

Liu Jinku1, Peng Jun2, Liu Jianjun3, Wang Yan1, Liu Jianfeng1   

  1. 1. Postgraduate School, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Scientific Research Department, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. SINOPEC Northwest Company, Urumqi, Xinjiang 830011, China
  • Received:2008-10-13 Online:2009-02-25 Published:2012-01-16

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摘要：

用薄片鉴定、扫描电镜等分析手段,对川中-川南过渡带荷包场、界市场地区(简称包界地区)上三叠统须家河组砂岩储层中绿泥石环边胶结物的产状、形成条件及其对储层孔隙的保存机制进行了研究。结果表明,绿泥石环边胶结物以等厚环边方式垂直颗粒表面生长,此类胶结物形成于早成岩阶段,其形成过程主要受沉积环境和物源条件控制;绿泥石环边胶结物的存在提高了岩石的抗压实能力,抑制了石英次生加大,促进了溶蚀作用,形成了有利的孔隙结构。因此,绿泥石环边胶结物对该区致密砂岩储层残余原生孔隙的保存起到了至关重要的作用。

关键词: 绿泥石环边胶结物, 致密砂岩, 孔隙保存机制, 须家河组, 包界地区, 四川盆地

Abstract:

The occurrence,forming conditions,and pore-preserving mechanism of chlorite rims in the Upper Triassic Xuejiahe Formation of Baojie area from central to southern Sichuan basin were studied in detail by means of thin section analysis and SEM analysis.The result shows that chlorite rims grew vertically on the grain surface and took the shape of isopachous grain-coating.This kind of cement was formed during the early diagenetic stage and was controlled mainly by depositional environment and provenance conditions.The presence of chlorite rims enhanced the compaction resistance of rock,inhibited quartz overgrowth on detrital-quartz grains,accelerated dissolution and formed excellent pore-throat configuration.Therefore,the chlorite rims played an important role in the preservation of residual primary pores in the tight sandstone reservoirs in the study area.

Key words: Chlorite rim, tight sandstone, pore preservation mechanism, Xujiahe Formation, Baojie area, Sichuan Basin

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