复杂地质条件页岩气勘探开发区块灰关联度优选

以南襄盆地、湘鄂西、渝东等地区的5个页岩气试验区块为研究对象,系统分析了不同地质参数对页岩气富集程度的影响,建立了页岩气勘探开发评价优选指标体系。运用层次分析法和熵权法确定了各指标的组合权重,在页岩气勘探开发指标体系中,各地质参数的重要性依次为有效厚度、热成熟度、脆性矿物含量、含气量、孔隙度、有机质丰度、埋深。针对页岩气藏储层地质参数存在的不确定性和复杂性,基于灰色系统理论,建立了多指标灰关联度优选模型,对评价指标值为区间范围的复杂地质参数特征的研究区的勘探开发潜力进行了优选排序。评价结果与实际勘探开发信息吻合较好,说明基于组合权重的复杂地质参数特征的页岩气勘探开发区块灰关联度优选评价模型对页岩气目标区块的可采性评价是可行的。

Grey correlation optimization for shale gas exploration and development areas of complicated geological parameter features

Took 5 shale gas test areas in Nanxiang Basin，western Hubei，Hunan- eastern Chongqing and other regions as the research objects，on the basis of systematic analysis of different parameters impactd on enrichment degree of shale gas，and shale gas exploration and development optimization evaluation system was established.Applying analytic hierarchy process(AHP)and entropy weight method to determine the combination weight vector.In the index system of shale gas exploration and development，the geological parameters order of importance is as follow：effective thinkness，buried，content of brittle mineral，gas content，porosity，organic matter abundance，depth.For the uncertainty and complexity of shale gas reservoir geologic parameter，based on the grey system theory，establishment of multi- objective gray relational optimization model，the exploration and development potential of research areas which evaluation indexes is interval number can be optimized and ranked.The evaluation results are in good agreement with the actual development information，which indicates the shale gas development potential grey correlation optimization model based on combination weight for recoverability evaluation of shale gas target areas is feasible.