摘要
针对滇东黔西多煤层、高地应力和构造复杂等地质特点,在明确提出煤层气地质选区过程中的有利区、甜点区和甜点段概念的基础上,阐明了3者之间"层次递阶"的关系。有利区指从滇东黔西的众多次级向斜中优选有利向斜,甜点区指从有利向斜中优选煤层气开发"靶区",甜点段是在煤层气开发"靶区"内从垂向上优选组合层段。针对研究区次级向斜多,勘探程度差异大,许多参数无法统一的特点,在有利区优选指标体系中提出了煤层气地质资源量、地质资源丰度和可采资源量相结合的关键指标,煤层气地质资源量和地质资源丰度为一票否决指标;针对研究区构造复杂和高地应力的特点,在甜点区优选指标体系中提出了断层分维值、构造曲率及埋深相结合的关键指标,断层分维值为一票否决指标;针对研究区多煤层发育,易诱发层间干扰的特点,在甜点段优选指标体系中提出了煤体结构、临界解吸压力差和储层压力梯度差相结合的关键指标,煤体结构为一票否决指标;并在各个阶段均提出了相应的参考指标,最终构建了针对研究区特点具有区域特色的煤层气地质选区指标体系。
In terms of the geological characteristics of multiple coal seams,high crustal stress and complex tectonic in eastern Yunnan and western Guizhou,the concept of favorable area,dessert area and vertical dessert in the process of coalbed methane( CBM) geological selection was put forward,and the relationship of "Hierarchical progressive"between the three was clarified.The favorable area refers to the favorable syncline in a number of secondary syncline.The dessert area refers to the "target area"for the development of CBM from favorable syncline. The vertical dessert is a vertical optimization of the combination layer in the "target area"of CBM development.The key indexes of CBM geological resources,geological resources abundance and recoverable resources were put forward in the optimization index system of favorable area aimed at the characteristics of a large of secondary syncline,great difference in many parame-ters and exploration degree.The amount of CBM geological resources and the abundance of CBM geological resources are one vote veto.The key indexes of fault fractal dimension,tectonic curvature and buried depth were proposed in the optimization index system of the dessert area aimed at the characteristics of complex tectonic and high crustal stress in the study area.The fractal dimension value of the fault is one vote veto. The key indexes of coal structure,critical desorption pressure difference and reservoir pressure gradient difference were put forward in the optimization index system of the vertical dessert aimed at the characteristics of the development of multiple coal seams and the interlayer interference in the study area.The coal structure is one vote veto.In all stages,the corresponding reference indexes were put forward.Finally,the index system of CBM geological selection for the characteristics of the study area was constructed.
引文
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