煤层割理响应特征与测井评价方法研究  

Research on coal seam cutting response characteristics and logging evaluation method

作　　者：王文文 梁玉楠 王振国 Wang Wenwen;Liang Yunan;Wang Zhenguo(China United Coalbed Methane Co.,Ltd.,Beijing 100016,China)

机构地区：[1]中联煤层气有限责任公司,北京100016

出　　处：《煤炭科技》2025年第1期7-11,共5页Coal Science & Technology Magazine

基　　金：中国海油石油集团公司“煤层气/页岩气/致密砂岩气三气共采先导性试验研究”资助项目。

摘　　要：煤储层与常规储层在性质、组分和气体赋存状态方面存在显著差异,同时煤层具备复杂的割理系统,割理发育程度与渗透率变化密切相关,因此有效评价煤层割理发育情况对煤层气高效开发意义重大。实验分析发现,煤层割理发育程度的变化会导致纵波、横波速度明显变化,即纵波、横波速度对割理密度敏感,因而可以从测井纵波、横波速度中获取地层的割理发育状况。基于Biot多孔介质理论,将割理对介质弹性性质的影响、孔隙与割理之间的局部流动效应引入原有方程,从而增加了割理密度和割理纵横比这两个描述割理关键参数。结合煤岩CT分析数据,对沁水盆地南部某区块煤层单井割理发育程度进行处理,获取该区块煤层割理密度和割理纵横比分布特征,分析割理特征参数对煤层单井产能的影响规律。There are significant differences between coal reservoirs and conventional reservoirs in terms of properties,components,and gas occurrence.At the same time,the coal seams have a complex cleat system.The degree of cutting development is closely related to changes in permeability,therefore,effectively evaluating the cleat development of coal seams is of great significance for the efficient development of coalbed methane.Experimental analysis found that changes in the development of coal seam cleats will cause significant changes in longitudinal and transverse wave velocities,that is,the velocities of longitudinal and transverse waves are sensitive to cleat density,so the cleat development status of the formation can be obtained from the log longitudinal and transverse wave velocities.Based on the Biot porous media theory,the impact of cleats on the elastic properties of the media and the local flow effect between pores and cleats are introduced into the original equation,thereby increasing the cleat density and the cleat aspect ratio,which are the key to describe the cleat parameter.Combined with coal and rock CT analysis data,the development degree of single well cleat in a certain block in the southern Qinshui Basin was processed,the cleat density and cleat aspect ratio distribution characteristics of the block coal seam was obtained,and the effect of cleat characteristic parameters on the coal seam was analyzed.

关 键 词：煤层气 割理特征 孔裂隙模型 BIOT理论 

分 类 号：P618.13[天文地球—矿床学]