黔西比德-三塘盆地煤储层压力特征及差异成因研究  

Study on pressure characteristics and difference causes of coal reservoirs in Bide-Santang Basin of western Guizhou

作　　者：姚帅 吴财芳[3] 杨长青[1,2] 李瑞强 陈泳霖[1,2] YAO Shuai;WU Caifang;YANG Changqing;LI Ruiqia;CHEN Yonglin(Henan Institute of Geological Survey, Zhengzhou 450001, China;Henan Industry & Technology InnovationStrategy Alliance of Underground Clean Energy Exploration and Development, Zhengzhou 450001,China;Key Laboratory of CoalbedMethane Resources and Reservoir Formation Process, China University of Mining & Technology, Xuzhou 221008, China)

机构地区：[1]河南省地质调查院,河南郑州450001 [2]地下清洁能源勘查开发产业技术创新战略联盟,河南郑州450001 [3]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221008

出　　处：《煤炭科学技术》2019年第4期162-168,共7页Coal Science and Technology

基　　金：国家自然科学基金项目资助(41572140);国家科技重大专项项目资助(2016ZX05044001)

摘　　要：为了研究黔西比德-三塘盆地煤储层压力特征及其差异成因,利用视储层压力法、注入/压降试井法获取了主要煤储层压力数据,分析了储层压力特征,并对压力差异成因进行了探讨。结果表明:研究区主要煤层以正常～低压储层压力状态为主,局部出现高压储层;高压储层主要分布在中部的水公河向斜和东部的阿弓、珠藏向斜的部分勘探区,低压储层主要分布在西部的比德向斜和北部的白泥箐向斜。煤层埋深、构造条件及地应力、渗透性、瓦斯压力及水动力条件是影响研究区储层压力状态的主要地质因素。浅部地层地下水流动较为活跃且影响因素复杂,导致了视储层压力状态多变。高地应力是造成煤储层渗透低、顶底板封盖性好、水动力条件弱的主要原因,并导致高压煤储层出现。燕山晚期地壳构造抬升剥蚀、开放性裂隙发育、较好的地下水径流条件是造成浅部地层压力偏低的主要原因。In order to study the characteristics of coal reservoir pressure and its differential causes in the Bide-Santang Basin of western Guizhou, the pressure data of the main coal reservoirs were obtained by using the reservoir pressure method and the injection pressure drop well testing method, and the reservoir pressure characteristics were analyzed. The causes of pressure difference were also discussed. The results show that the main coal seams in the study area are dominated by the normal-low pressure reservoir pressure, and high-pressure reservoirs are locally present. The high pressure reservoirs were mainly distributed in the partial exploration areas of Shuigonghe Syncline in mid basin, and the eastern part of the Agong and Zhuzang Syncline. The low pressure reservoirs were mainly located in Bide syncline in west and Bainiqing Syncline in north. The main geologic factors affecting reservoir pressure were buried depth of coal seam, structural conditions and crustal stress, permeability, gas pressure and hydro-dynamic condition. The groundwater flow in the shallow stratum is active and the influencing factors are complex, resulting in variable reservoir pressure conditions. The low permeability caused by the crustal stress, the excellent sealing function of roof and floor, and the weak hydrodynamic conditions were the potential reasons for the abnormal high pressure. The tectonic uplift denudation in late Yanshan Mountain, open fracture development, and better run off conditions were the major reasons for low pressure in shallow reservoirs.

关 键 词：比德-三塘盆地 煤储层 压力特征 异常压力 差异成因 

分 类 号：TD163.1[矿业工程—矿山地质测量] P55[天文地球—构造地质学]