• 方法理论 •

### 一种页岩有机孔与无机孔定量表征的方法

1. 中国石化华东油气分公司勘探开发研究院,江苏 扬州 225007
• 收稿日期:2019-07-24 出版日期:2020-02-26 发布日期:2020-02-04
• 作者简介:蔡潇（1988 —）,男,本科,工程师,主要从事石油地质实验方面的研究工作。通讯地址：江苏省扬州市邗沟路50号,邮政编码：225100。E-mail: caixiao2370@sina.com
• 基金资助:
“十三五”国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061);中国石化科技部项目“渝东南盆缘转换带页岩气富集主控因素研究”(P18057-2)

### A quantitative characterization method for organic and inorganic pores in shale

CAI Xiao,JIN Yaxi,YE Jianguo,PENG Liu,SUN Jingrong,ZHU Yichuan

1. Exploration and Development Research Institute, Sinopec East China Oil and Gas Company, Yangzhou, Jiangsu 225007, China
• Received:2019-07-24 Online:2020-02-26 Published:2020-02-04

Abstract:

The results of surface porosity obtained by scanning electron microscopy image processing can effectively reflect the development degree of shale organic matter pore. On the premise that the statistical sample is large enough, the pore size of organic matter can be quantitatively characterized relatively accurately. Due to the limitation of absolute resolution of scanning electron microscopy, the organic pore content was underestimated in the pore size range of less than 2 nm. The results of pore size distribution obtained by adsorption method need to be corrected. Combined with TOC and effective porosity, the porosity of shale organic matter can be calculated, and the proportion of organic and inorganic pore can be obtained indirectly. The data of 4 shale gas wells in southeastern Chongqing show that organic pore is the main type in Wulong and Dongsheng area, and the proportion of organic pore in bottom layer（① to ②） is high, up to 85.89 %. Pengshui area is controlled by organic carbon, and the proportion of organic pore is not more than 20 %. The organic pore proportion in Pingqiao area ranges from 20 % to 30 %, and the bedding fissures and laminar structures are relatively developed, especially the possible fissures or grain margin fissures between clastic particles and muddy interbeds in laminar structures contribute greatly to the inorganic pore. The proportion of organic pore is mainly affected by the abundance of organic matter and the degree of pore development of organic matter. The ratio of organic pore is highly consistent with the variation of TOC content in the vertical direction.

• TE135