宣化-下花园煤田煤层气地质条件及资源勘查潜力评价

摘要

通过对宣化-下花园煤田各主要煤储层地质条件、生气特征、含气性特征及储层物性特征等的综合评价,认为宣化-下花园煤田各主要煤储层具有厚度较大、变质程度适中、气含量及甲烷组分含量高,煤体结构好、处于超压异常状态,对后期开发有利,但煤储层孔渗性较低,需经后期压裂、注水等对其进行改造,方能实现产业化开发.今后仍需进一步加大勘查及研究力度,系统、全面的摸清区内煤层气资源勘探开发前景,寻求适宜的开发途径.%Through comprehensive assessment of coal reservoir geological condition , gas-forming, gas-bearing and reservoir physical property characteristics in the Xuanhua -Xiahuayuan coalfield , considered that the main coal reservoirs in the coalfield have larger thickness , moderate metamorphism degree , high gas content and methane component content , good coal mass structure ,and in a over-pressure situation , thus favorable for later exploitation .But because of lower permeability of coal reservoir , thus later stage transforma-tion of hydraulic fracturing , water injection should be carried out , so that industrial exploitation can be achieved .From now on,to strengthen exploration and research dimensions , systematically ,roundly feel out CBM resource exploration and exploitation prospect in the study area , thus appropriate exploitation approaches can be found out .