黔西地区煤储层压力发育特征及成因  

Characteristics and origin of coal reservoir pressure in the west Guizhou area

作　　者：许浩[1] 汤达祯[1] 秦勇[2] 孟昌忠[3] 陶树[1] 陈贞龙[1] 

机构地区：[1]中国地质大学海相储层演化与油气富集机理教育部重点实验室能源学院,北京100083 [2]中国矿业大学资源与地球科学学院,江苏徐州221116 [3]贵州省地矿局113地质队,贵州水城553000

出　　处：《中国矿业大学学报》2011年第4期556-560,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(40730422);国家重点基础研究发展计划(973)项目(2009CB219604);国家科技重大专项(2008ZX05034)

摘　　要：为了查明黔西地区煤储层压力差异发育的成因，从区域和构造单元两个层次探讨了煤储层压力的分布特征以及保存条件、生气条件、渗透性和地应力特征等因素对储层压力的影响．结果表明：该区煤储层主要以正常压力（压力系数为0．9～1．1）和高压系统（压力系数大于1．1）为主，不同构造单元内同一煤层压力系数差别大，同一构造单元内不同煤层压力系数也存在较大差别．储层渗透性和地应力发育特征影响着各套煤储层的差异沟通能力，决定了储层压力的高低，是区域储层压力差异发育的主要原因．对于盘关向斜，由于具有较好的压力保存条件，煤储层压力的差异发育受到生气条件的影响，同时也遵循由应力主导下的渗透性控制规律．In order to identify the controlling factors in differential development of the coal res- ervoirs pressure in the west Guizhou area, the distribution character of the coal reservoir pressure was discussed in two levels, the whole region and tectonic unit. The effects of storage conditions, gas generating conditions, permeability and stress characteristic on the reservoir pressure were analyzed. The results show that the pressure systems of the coal reservoir in the study area are mainly normal （pressure coefficient 0.9--1.1） and high pressure（pressure coef- ficient p〉 1.1）. The pressure coefficient has a great difference in the same coal seam of differ ent tectonic unit and the different coal seam of the same tectonic unit. The reservoir permeabil ity and stress development characteristics, which affect the differential connectivity of the various sets of the coal reservoir and determine the level of reservoir pressure, are main reasons of regional differences in reservoir pressure. In the Panguan syncline, due co the good pressure preservation conditions, the differential development of the coal reservoir pressure is subject tothe impacts on gas-generating conditions, which also keep to the control law of permeability under the stress-led of the region.

关 键 词：黔西地区 煤层气 储层压力 差异发育 成因 

分 类 号：P618.19[天文地球—矿床学]