The Pore Size Distribution and Its Relationship with Shale Gas Capacity in Organic-rich Mudstone of Wufeng-Longmaxi Formation,Sichuan Basin

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  • School of Earth Sciences & Key Laboratory of Western China′s Mineral Resources of Gansu Province, Lanzhou University,Lanzhou 730000,China

Received date: 2015-04-28

  Revised date: 2015-05-22

  Online published: 2015-09-10

Abstract

Pore size distribution for 23 fresh outcrop shale samples collected from Shuanghe Town,Changning County and 14 core samples collected from the well Qianqian 1 in southeast Chongqing,Sichuan Basin were investigated by low pressure nitrogen adsorption.The main factors controlling pore development and gas accumulation in shales were discussed by integrating total organic carbon(TOC),mineralogy and shale gas content.The results show that open slit-like and parallel plate structure are major pore types with an average pore diameter of 3.76-8.53nm, and 2-30nm mesopores are dominated.The BET surface area and total pore volume are high in the Wufeng Formation and lower part of the Longmaxi Formation,and the decrease in the upper part of the Longmaxi Formation,in consistent with the trends of TOC,suggesting that organic matter is the key controlling factor on the shale pore development.In addition,samples with higher content of clay minerals but similar TOC content have larger specific surface area,and the clay-mineral-hosted pores are present.The Wufeng Formation and lower part of the Longmaxi Formation in the Sichuan Basin are preferred layers of shale reservoir fracturing because of high TOC,high rock brittleness and high gas content.

Cite this article

ZHANG Yu,YAN Jian-ping,JIA Xiang-juan,LI Yan-fang,SHAO De-yong,YU Ping,ZHANG Tong-wei . The Pore Size Distribution and Its Relationship with Shale Gas Capacity in Organic-rich Mudstone of Wufeng-Longmaxi Formation,Sichuan Basin[J]. Natural Gas Geoscience, 2015 , 26(9) : 1755 -1762 . DOI: 10.11764/j.issn.1672-1926.2015.09.1755

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