利用测井资料定量评价煤层顶底板的封闭性  

Quantitatively evaluating sealing ability of coal roof and floor using logging data

作　　者：刘之的[1] 杨秀春 张继坤 陈彩红 周科 王剑[1] 

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]中石油煤层气有限责任公司,北京100028

出　　处：《中南大学学报（自然科学版）》2015年第3期1100-1109,共10页Journal of Central South University:Science and Technology

基　　金：陕西省自然科学基础研究计划项目(2013JQ5008);西安石油大学博士科研启动项目(2014BS22);中国石油天然气股份有限公司科学研究与技术开发项目(2010E-2207)~~

摘　　要：煤层顶底板的封闭性能是煤层气富集高产的主控因素之一。利用测井资料,基于岩心刻度测井的思想,通过对煤层顶底板岩性、物性和裂缝发育特征等的综合分析,选取岩性系数、岩层厚度、孔隙度、渗透率、裂缝强度指数这5个评价指标作为影响煤层顶底板封闭性能的主要因素,得出煤层顶底板封闭性综合评价模型,并以此模型计算的综合评价指数对研究区煤层顶底板的封闭性展开定量评价。研究结果表明:煤层顶底板封闭性与其顶底板的岩性、物性、厚度及裂缝发育特征等密切相关,其封闭性能与岩性系数、厚度呈正比关系,与孔隙度、渗透率和裂缝强度指数呈反比关系。煤层顶底板封闭性综合评价指数越高,封闭性能越好。研究区5号煤层顶底板的封闭性较好,封闭性能较强的区域位于西部、南部及中部韩1 0-1 1井区,较差的区域位于东北部。The sealing capability of the coal seam roof and floor is the main controlling factor in the enrichment and high yield of the coalbed methane. Based on the idea of core scale logging, by comprehensively analyzing the lithology, physical properties and fracture development characteristics of coal seam roof and floor using logging data, the five evaluation indexes which are lithology coefficient, strata thickness, porosity, permeability and fracture intensity index act as the main factors influencing the sealing ability of coal seam roof and floor. The comprehensive evaluation model of sealing ability of coal seam roof and floor was established, and the calculated evaluation indexes were used to quantitatively evaluate the sealing ability of coal seam roof and floor in the study area. The research results show that the sealing ability of coal seam roof and floor is closely related to the lithology, thickness, physical property and fracture development characteristics of roof and floor, and the sealing performance is proportional to the thickness and lithology coefficient, and is inversely proportional to the porosity, permeability and fracture strength index. The comprehensive evaluation index of the sealing ability of coal seam roof and floor is higher, and the sealing ability is better. The sealing ability of the No.5 coal seam roof and floor is better in the study area, the strong area of sealing capability is located in the west, south and central H10-11 wellblock, and the poor area is located in the northeast.

关 键 词：煤层气 顶底板 封闭性 测井 定量评价 

分 类 号：P618.11[天文地球—矿床学]