鄂尔多斯盆地大宁—吉县区块深部煤层含气饱和度测井计算方法及分布特征  

Calculation method of gas saturation and distribution characteristics of deep coal seam in Daning-Jixian block using logging data

作　　者：刘之的 韩鸿来 王成旺 王伟[3] 季亮 陈高杰 陈龙 王舵 谢正龙 LIU Zhidi;HAN Honglai;WANG Chengwang;WANG Wei;JI Liang;CHEN Gaojie;CHEN Long;WANG Duo;XIE Zhenglong(College of the Geoscience and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Institute of Engineering and Technology,PetroChina Coalbed Methane Company Limited,Xi’an 710082,China;Hancheng Gas Production Administration of PetroChina Coal Bed Methane Co.,Ltd.,Xi’an 710082,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]中国石油煤层气有限责任公司工程技术研究院,陕西西安710082 [3]中国石油煤层气有限责任公司韩城采气管理局,陕西西安710082

出　　处：《天然气地球科学》2024年第2期193-201,共9页Natural Gas Geoscience

基　　金：陕西省重点研发计划项目(编号:2022GY-130);陕西省教育厅重点科学研究计划项目(编号:20JY056)联合资助。

摘　　要：煤层含气饱和度的精准计算及分布特征直接关系到煤层气富集区预测和开发方案有效制定。以鄂尔多斯盆地大宁—吉县煤层气田深8#煤储层为研究对象,从煤层气等温吸附曲线出发,给出煤层含气饱和度计算模型之后,充分利用地球物理测井资料建立了煤层含气饱和度与兰氏体积、兰氏压力、储层压力及含气量等参数的测井求取方法,进而形成了深部煤层含气饱和度测井计算方法。将该套方法程序化,实现研究区内各井深8#煤层的含气饱和度计算机可视化自动处理,并编绘了研究区含气饱和度平面分布图。研究表明:所述方法能够较好地用于研究区深部8#煤储层含气饱和度计算;研究区煤层含气饱和度整体上由东向西递增,由北向南先递减后递增、再递减后递增。其中,过饱和气藏区位于研究区南部DJ50井、DJ37井一带,饱和气藏区主要位于研究区的北部、中部,欠饱和气藏区在研究区广泛分布。该方法可为地球物理测井预测深部煤层含气饱和度提供一种新途径,为煤层气富集区预测提供基础参数。The accurate calculation and distribution characteristics of CBM saturation are directly related to the prediction of CBM enrichment area and the effective formulation of CBM development plan.Based on the adsorption isotherm curve of coalbed methane in the Daning-Jixian gas field,this paper gives a calculation model of coalbed gas saturation,and then fully excavates the geophysics logging information,a logging method is established to determine the parameters of Lannister volume,Lannister pressure,reservoir pressure and gas content in coal bed gas saturation,and a logging method for deep coal bed gas saturation is formed.The method is programmed to realize the computer visual automatic processing of gas saturation of 8#coal reservoirs in each well depth in the area,and the plane distribution map of gas saturation in the study area is drawn.The study shows that the method described in this paper can be used to calculate the gas saturation of 8#coal reservoir in the deep part of the study area,and the gas saturation of the coal bed in the study area increases from east to west on the whole,from the north to the south after the first decline,and then decline after the increase.The supersaturated gas reservoir area is located in Wells Daji 50 and Daji 37 in the south of the study area,and the saturated gas reservoir area is mainly located in the north and middle of the study area.This method can provide a new way for geophysics log to predict gas saturation in deep coalbed and a basic parameter for prediction of CBM enrichment area.

关 键 词：煤层气 含气饱和度 分布特征 深部煤层 测井资料 

分 类 号：TE122.3[石油与天然气工程—油气勘探]