大宁―吉县煤区煤层气开发需要解决的几个基本问题

指出大宁-吉县煤区的煤层气地质条件比晋城煤区要复杂得多,主要表现在山西组煤的沉积环境变化比较大、煤层的厚度变化大,有明显的变薄与尖灭现象;该区的构造变化也比较明显,水文地质条件也呈现出十分明显的多样性,加上与煤层气藏保存直接有关的煤层顶底板岩性与厚度的明显变化,造成控制煤层气富集与高产的因素组合关系比较多,煤层气藏类型比较多,煤层气藏边界复杂,认为该区煤层气藏的一些细节特征还有待进一步深入研究与总结。又指出煤与煤层气勘探施工的钻孔稀少,目前所积累的资料显然不能满足开发的需要,突出表现在煤层厚度与煤储层特征控制等方面,认为大宁-吉县煤区煤层气藏的复杂性决定了试验开发阶段的节奏不能太快,最好以满足地质认识和工程技术积累为前提来设计工作量,待积累了一定经验后再大规模开发。

THE SEVERAL PROBLEM OF THE COALBED METHANE DEVELOPMENT IN THE DANING-JIXIAN COAL FIELD

It is very complex compare the coalbed methane conditions between the DaningJixian coal field and the Jincheng coal field.For example the deposit environment of Shanxi formation and the thickness change of the coal seams of Shanxi formation are very changeable in very small areas.The structure and hydrogeology are more complex.The boundaries of the of coal pools are complex.Thus the detail features of coal pools should be summarized.The data of coalbed methane exploration is not enough for the coalbed methane development because of few wells which can not control the changes of coal seams and structure.The speed of the exploration & development of coalbed methane is depend on the complex of the thickness change of the coal seams,the structure and hydrogeology,the deposit environment of Shanxi formation.