响水煤矿煤层气储层特征研究

Study on Characteristics of Coalbed Methane Reservoir in Xiangshui Coal Mine

煤层气储层特征研究对煤层气的勘探开发具有重要意义。响水煤矿煤层气资源丰富,本文依据分析测试结果,对响水煤层气储层特征进行了研究,为煤层气的开发提供基础数据支撑。在前期煤田地质研究的基础上,对响水煤矿煤层气参数井进行采样,采用煤储层宏观煤岩分析、显微煤岩分析、孔径分布与覆压孔渗分析等分析测试方法,达到了获取储层裂隙与孔隙特征、渗透率、压力、吸附性等特征参数的目的。研究结果表明:响水煤矿煤层气储层裂隙发育,连通性中等;孔隙结构以形状不规则的铸模孔为主,其次为少量的溶蚀孔,孔间部分被黏土矿物充填,孔隙类型以小孔和中孔为主。3、28号煤层为中等渗透率储层,其他煤层渗透率偏低,煤储层压力梯度正常。响水煤矿煤层对甲烷的吸附量较大,达到20.04~29.35cm^3/g。与国内沁水盆地煤层气储集性能比较,响水煤矿煤层气储层特征良好,总体上优于沁水盆地,具有良好的勘探开发前景。

The research on the characteristics of coalbed methane reservoir is of great significance to the exploration and development of the coalbed methane.Xiangshui Coal Mine is rich in coalbed methane re-sources.In this paper,the characteristics of Xiangshui coalbed methane reservoir are studied to provide data support for the development of coalbed methane based on the analysis and testing results.Based on the previ-ous study of coalfield geology,samples are taken from coalbed methane parameter wells in Xiangshui Coal Mine.Macro coal rock analysis,micro coal rock analysis,pore diameter distribution and porosity and permeability analysis on overburden pressure and other methods are applied for getting fracture and pore characteris-tics,permeability,pressure,adsorption and other characteristic parameters of the reservoirs.The results show:the coalbed methane reservoir in Xiangshui Coal Mine has developed fissures and medium connectivity.The pore structure is mainly mold pores with irregular shape,followed by a small number of dissolution pores.The pores are partially filled with clay minerals,and the pore types are mainly small pores and medium pores.Coal seam 3.28 is a medium permeability reservoir,other coal seams have low permeability and normal pressure gradient.The adsorption capacity of coal seams in Xiangshui Coal Mine to methane is large,reaching20.04-29.35 cm^3/g.Compared with the reservoir performance of Qinshui Basin in China,Xiangshui Coal Mine has good reservoir characteristics,which is better than Qinshui Basin in general,and has a good prospect of exploration and development.