Independent Superposed CBM-bearing Systems Vertical Distribution and Coal Reservoir Adsorption&nbsp;and Seepage Characteristics in Bide-Santang Basin,Western Guizhou

GUO Chen

doi:10.11764/j.issn.1672-1926.2015.01.0168

2015 , Vol. 26 >Issue 1: 168 - 179

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.01.0168

Independent Superposed CBM-bearing Systems Vertical Distribution and Coal Reservoir Adsorption and Seepage Characteristics in Bide-Santang Basin,Western Guizhou

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Key Laboratory of CBM Resources and Reservoiring Process,China University of Miningand Technology,Xuzhou 221116,China

Received date: 2014-04-17

Revised date: 2014-06-29

Online published: 2015-01-10

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Abstract

In order to explore the development rule and formation mechanism of independent superposed CBM-bearing systems and reveal the coal reservoirs adsorption and seepage characteristics under condition of multiple superposed coal seams and CBM-bearing systems,this article collects coal and rock samples from two representative boreholes located in Bide-SantangBasin,western Guizhou.For rock samples,experiments of mercury injection porosimetry,breakthrough pressure,scanning electron microscope and casting lamella are conducted respectively,while mercury injection porosimetry and low temperature nitrogen adsorption tests are conducted on coal samples.The following conclusions are obtained:sequence stratigraphic framework controls the CBM-bearing systems vertical distribution by controlling the variation of rock seepage capacity in vertical.Marine mudstone developed regionally in the maximum flooding surface(MFS) is highly compacted with the cementation of pyrite,siderite and carbonate minerals,as a result,the pores developed very weekly and the breakthrough pressure is high,which made the MFS stratum liable to form regional impermeable barrier.The stratum near the sequence boundary(SB) develops secondary pore on the influence of exposure,washing and leaching during the sedimentary hiatus,which enhanced the rock seepage capacity and promoted the fluid contact between adjacent coal seams.On this basis,the coal-bearing strata are divided into five CBM-bearing systems by MFS:No.1-5 coal seams,No.6-13 coal seams,No.14-21 coal seams,No.22-32 coal seams and No.33-35 coal seams.No.2 and 35 coal seams have favorable pore systems for CBM seepage,while other coal seams have relatively poor seepage condition.No.6 coal seam has better CBM adsorption and storage capacity,then the No.2,16,23 and 35 coal seams,and the No.21,30 and 32 coal seams have relatively poor adsorption and storage capacity.

Key words： Bide-Santang Basin; Independent superposed CBM-bearing systems; Formation mechanism; Coal reservoir; Pore structure; Seepage; Adsorption

Cite this article

GUO Chen . Independent Superposed CBM-bearing Systems Vertical Distribution and Coal Reservoir Adsorption and Seepage Characteristics in Bide-Santang Basin,Western Guizhou[J]. Natural Gas Geoscience, 2015 , 26(1) : 168 -179 . DOI: 10.11764/j.issn.1672-1926.2015.01.0168

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