|Table of Contents|

Development Characteristics of Organic Matter Pores of Marine Shale in the Southeastern Chongqing, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第06期
Page:
721-733
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Development Characteristics of Organic Matter Pores of Marine Shale in the Southeastern Chongqing, China
Author(s):
WANG Si-yuan1;  LI Jun-qian1*;  LU Shuang-fang1;  ZHANG Peng-fei1;  ZHANG Jie2;  LI Wen-biao1
(1. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China; 2. COOEC Subsea Technology Co., Ltd., Shenzhen 518067, Guangdong, China)
Keywords:
organic matter pore;  pore type;  development characteristic;  SEM;  kerogen;  bitumen;  shale;  Sichuan Basin
PACS:
P618.13; TE122
DOI:
-
Abstract:
Organic matter pores are the main contributors to the gas storage space in high-over mature marine shales. Based on the research of the shale from Wufeng-Longmaxi Formations in the southeastern Sichuan Basin(the southeastern Chongqing), the organic matter is divided into two types of kerogen and bitumen. Kerogen is further sub-divided into two types of unstructured kerogen and structural kerogen, bitumen is sub-divided into solid bitumen and composite organic matter. Organic matter pores are divided into three types according to the distribution and development characteristics, including kerogen-inner pore, sponge-shaped pore and bubble-shaped pore. The organic matter pores were extracted using scanning electron microscopy(SEM)and image processing software ImageJ, and the development characteristics of different types of organic matter pores were analyzed by pore morphology parameters, such as roundness, convexity, elongation and fractal dimension. The results show that ①the surface porosity of organic matter is positively related to total organic carbon(TOC); ②when the TOC is lower than 2%, the average pore size and fractal dimension decrease with the increase of TOC, indicating that organic matter pores tend to be uniform with the increase of TOC; when the TOC is higher than 2%, on the contrary, the organic matter pores tend to be complicated with the increase of TOC; ③unstructured kerogen mainly develops micropores(<25 nm)and small pores(25-1 000 nm), and few mesopores(100-1 000 nm); structural kerogen mainly develops micropores, followed by small pores, and less mesopores; bitumen mainly develops small pores and a few of mesopores and large pores(>1 000 nm); ④compared with organic matter pores in bitumen, the pores in kerogen have larger roundness and convexity, and lower elongation; however, due to the small average pore size and high contents of small pore in kerogen, the fractal dimension is higher in kerogen than that in bitumen.

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Last Update: 2019-11-19