中国地质2025，Vol.52Issue(2)：597-612,16.DOI:10.12029/gc20220612002
黔西北地区上二叠统煤层气富集机理与有利区优选评价
Enrichment mechanism,optimization and evaluation of favorable CBM areas in the Upper Permian of Northwest Guizhou
摘要
Abstract
This paper is the result of energy exploration engineering. [Objective]The primary goal is to identify and classify favorable areas for CBM exploration and development,providing a scientific basis for future exploration efforts in Guizhou Province.[Methods]Based on geological exploration data and laboratory sample analyses,key reservoir characteristics of the major coal seams(No.6,No.14,and No.27)were systematically assessed.Parameters such as coal seam thickness,gas content,permeability,reservoir pressure,and coal-body structure were analyzed.Using a five-index evaluation method,19 gas-bearing areas were classified.[Results](1)The three major coal seams exhibit greater thickness in the southwest and thinner deposition toward the northeast.The average gas content is 11.73 m3/t,with gas accumulation primarily controlled by synclinal structures.(2)Seven extensive gas-bearing areas were identified,with the Bide-Santang Basin and the Jinlong-Qianxi-Jinsha syncline group exhibiting gas contents exceeding 16 m3/t.(3)The average well-tested permeability of the coal seams is 0.173 mD,indicating a medium-low permeability reservoir.Permeability decreases from west to east and with increasing depth,with significant variations across different seams.(4)The average reservoir pressure is 4.98 MPa,with an average pressure coefficient of 0.86,indicating a predominantly underpressured state.A transition from underpressure to normal and overpressure is observed from east to west.(5)Coal structural characteristics vary spatially,with primary and fragmented coal types dominant in the east,while granulated and pulverized coal types are more prevalent in the west.[Conclusions]Based on the evaluation,seven Grade I,eight Grade II,and four Grade III favorable CBM areas were identified.The Grade I areas,including the Tucheng,Yangmeishu,Dahebian,Shuigonghe,Bide,Zhitang,and northern Jinlong synclines,demonstrate significant CBM exploration and development potential.The Grade II areas include the Gemudi,Jinpen,Santang,northern Qianxi,Jinsha,Liuchang,and Molaoba synclines,while the remaining synclines are classified as Grade III.关键词
煤层气/上二叠统/储层属性/有利区/能源勘查工程/黔西北Key words
coalbed methane/Upper Permian/reservoir characteristics/favorable exploration area/energy exploration engineering/Northwest Guizhou分类
天文与地球科学引用本文复制引用
李鸿磊,郭志军,易同生,秦勇,杨通保,金军..黔西北地区上二叠统煤层气富集机理与有利区优选评价[J].中国地质,2025,52(2):597-612,16.基金项目
贵州省省级地质勘查专项资金项目(208-9912-JBN-UTS0)、贵州省科技计划项目(ZDSYS[2023]002、KXJZ[2024]003)联合资助. Supported by Guizhou Provincial Geological Exploration Special Fund Project(No.208-9912-JBN-UTS0),Guizhou Provincial Scientific and Technological Program(No.ZDSYS[2023]002,No.KXJZ[2024]003). （208-9912-JBN-UTS0）
