Journal
MARINE AND PETROLEUM GEOLOGY
Volume 48, Issue -, Pages 8-19Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2013.07.008
Keywords
Shale gas; Pore structure; Lower Silurian shale; Sichuan Basin
Categories
Funding
- National Key Basic Research Program of China [2012CB214705]
- Tukuangchi Talent Foundation [GIGRC-10-02]
- National Natural Science Fund of China [41072095]
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Although Lower Silurian black shales within and around the Sichuan Basin have received renewed attention during the past few years because of their potential prospectivity for shale gas, studies associated with shale gas reservoir evaluation are still rare. In this study, eight black shale core samples were collected from a well drilled recently in the Chuandong Thrust Fold Belt, southwestern China, and their geochemistry and pore structures were investigated using low pressure N-2 adsorption analysis and field emission scanning electron microscopy (FE-SEM) observations. The results show that the black shales have total organic carbon (TOC) values ranging from 1.01% to 3.98% and their equivalent vitrinite reflectance values are in the range of 2.84%-3.05%. Both mineral matrix and organic matter pores are well developed with pore sizes ranging from several to several hundred nanometers. The total porosity for the eight samples ranges from 2.60% to 4.74% and the percentages of organic matter pores are estimated to be in the range of 31%-62%. The total surface area ranges from 5.06 m(2)/g to 19.32 m2/g and the micropore (< 2 nm) surface area estimated by the t-plot method ranges from 3.13 m(2)/g to 9.27 m2/g. The TOC values have positive relationships with the total porosity, total surface area and the micropore (<2 nm) volume and surface area, indicating TOC may be an effective parameter for shale gas reservoir evaluation in the studied area. (c) 2013 Elsevier Ltd. All rights reserved.
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