摘要
为了进一步研究含煤地层中非常规天然气的开发潜力,以山西霍西地区煤系泥岩为主要研究对象,基于矿物成分、孔渗性等测试结果,从岩相特征、矿物学组成、孔渗性等方面分析了霍西地区煤系泥岩层的储层特征,同时从烃源岩的有机质丰度、类型和成熟度3方面初步判断了霍西地区煤系泥岩层的生烃潜力。结果表明:山西霍西地区内煤系泥岩层厚度大,矿物组成以黏土矿物为主,孔隙度较低,渗透性差,为煤系气的保存提供了良好的条件。同时山西霍西地区总体上有机质类型以Ⅲ型干酪根为主,有机碳含量大于1.5%的样品约占68%;有机质成熟度以1.8%~2.0%为主,热解生烃能力强。相对而言,太原组煤系泥岩中有机碳含量高达3.94%是其生烃潜力要高于山西组和下石盒子组煤系泥岩的主要原因,可以优先作为有利勘探区。
In order to further study the development potential of unconventional natural gas in coal-bearing formations,this paper took coal measures mudstone in Huoxi Area of Shanxi Province as the main research objects,then the reservoir characteristics of coal measure mudstone in Huoxi were analyzed from the aspects of lithofacies characteristics,mineralogical composition and pore permeability based on the test results of mineral composition and porosity. The reservoir characteristics of coal-bearing mudstone formations in the Huoxi Area were analyzed. At the same time,the hydrocarbon generation potential of the coal-bearing mudstone formations in the Huoxi Area was preliminarily evaluated from three aspects of source rock organic matter abundance,type,and maturity. The results show that the mineral composition in the study area is mainly clay minerals,and there are large thickness,low porosity and poor permeability,which provides good conditions for the preservation of coal measure gas. At the same time,the type of organic matter in Huoxi Area is mainly Type Ⅲ kerogen with strong pyrolysis hydrocarbon generation ability,and 68% of the samples with organic carbon content greater than 1.5%,and the maturity of organic matter Ro is mainly 1.8% to 2.0%.In addition,the TOC content of coal measures mudstone of Taiyuan Formation is as high as 3.94%,which is the main reason why its hydrocarbon generating potential is higher than the coal measures mudstone of Shanxi Formation and Lower Shihezi Formation. Thus it can be preferentially viewed as a favorable exploration area.
作者
周豪博
任国杰
杨燕青
张小东
张硕
ZHOU Haobo;REN Guojie;YANG Yanqing;ZHANG Xiaodong;ZHANG Shuo(No.217 Geology Team,Shanxi Provincial Geological Prospecting Bureau,Linfen 041000,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region,Henan Province,Jiaozuo 454000,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2020年第5期164-172,共9页
Coal Science and Technology
基金
国家自然科学基金资助项目(41372162)
河南省高校科技创新团队支持计划资助项目(14IRTSTHN002)。
关键词
霍西地区
煤系泥岩
储层特征
生烃潜力
coal measures mudstone
reservoir characteristics
hydrocarbon generation potential evaluation
coalbed methane
