东北石油大学学报2025，Vol.49Issue(6)：85-97,13.DOI:10.3969/j.issn.2095-4107.2025.06.007
沁水盆地北缘晋中区块深部煤层气富集规律及有利区优选
Enrichment law of deep coalbed methane and optimization of favorable areas in Jinzhong Block on the northern margin of Qinshui Basin
摘要
Abstract
In order to clarify the enrichment law of deep coalbed methane in Jinzhong Block,geological,experimental testing,well testing,and logging data are comprehensively utilized.Taking the 15# coal seam in Jinzhong Block as the research object,the geological characteristics,sedimentation,structure,and hydrological control of coalbed methane are elucidated from the aspects of coalbed methane geolog-ical features,sedimentation,structure,and hydrological control.The results show that the burial depth of the 15# coal seam in the Taiyuan Formation of the Jinzhong Block is characterized by shallow depth in the middle,gradually deepening towards the northwest and southeast,with an average thickness of 6.14 meters.The coal structure is mainly composed of primary fragmented coal,and the coal rock types are mainly bright coal and semi bright coal.The industrial and microscopic components are dominated by vitrinite and fixed carbon,and the maximum vitrinite reflectance Ro ranges from 2.49％to 3.00％.It belongs to high maturity and high-quality anthracite,which is conducive to coalbed methane generation and storage.The average porosity is 5.48％ and permeability is 0.40×10-3 μm2,reservoirs belong to high permeability deep coal reservoirs.Macroscopic and microscopic fractures are relatively developed,with micropores as the main pore.The Langmuir volume average is 33.65 m3/t.The coal reservoir has strong adsorption and storage capacity,with an average gas content of 17.69 m3/t.The overall struc-ture of Jinzhong Block is composed of a central northeast trending anticline axis and northwest and southeast lateral inclined single wings.The northwest part has developed faults,while the central southeast part has relatively underdeveloped faults.High thickness mudstone is often developed on the roof of coal seams.The hydrodynamic conditions gradually weaken from the northwest to the southeast.Construct an evaluation index system including gas content,coal seam thickness,burial depth,roof and floor lithology,degree of fault development,and hydrodynamic conditions parameters,and divide the favorable areas for deep coalbed methane enrichment into Class Ⅰ and Class Ⅱ.This result can provide guidance for the optimal selection and efficient development of deep coalbed methane favorable areas in Jinzhong Block.关键词
沁水盆地北缘/晋中区块/地质特征/深部煤层气/富集规律/有利区Key words
northern margin of Qinshui Basin/Jinzhong Block/geological features/deep coalbed meth-ane/enrichment law/favorable areas分类
能源科技引用本文复制引用
郑永旺,赵鹏,李超,吴剑,郭涛,周亚彤,金晓波,彭兴平,唐宁,吴财芳..沁水盆地北缘晋中区块深部煤层气富集规律及有利区优选[J].东北石油大学学报,2025,49(6):85-97,13.基金项目
中国石化科技攻关项目(P23205) （P23205）
中国石化科技攻关项目(P23230) （P23230）
中国石化科技攻关项目(P24118) （P24118）
