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储层认识不成熟以及评价信息不完备等问题,给苏里格气田苏X井区盒8下亚段低渗透气藏早期的储层评价带来很多不确定性,进而无法精细刻画储层特征。如何充分体现储层评价过程的不确定性以及有效扩大评价结果的差异性,则成为改善储层评价效果的关键。以隶属度为纽带,按照多信息叠合思想,将不确定方法中的模糊综合评价和灰色关联评价方法有机组合,对内部算法进行差异化改进处理,建立了更加有效的模糊-灰色综合评判方法。实例应用表明,新方法在兼顾研究区储层评价模糊性和灰色性的同时,还提高了低渗透储层的区分度,提升了储层描述的精度。根据改进后的储层分类结果,将盒8下亚段划分出4类储层,其中Ⅰ和Ⅱ类为有利储层。平面上储层展布与过去的近连片认识相比刻画得更加精细,储层类别间具有较好的区分,更贴近河流沉积的发育规律和地质知识库,与已有实践成果和地质认识也大致匹配。该方法能够快速有效地指导气田勘探开发部署实践,为类似的低渗透储层评价提供了新的思路。
Immature understanding of reservoirs and incomplete evaluation information, which bring a lot of uncertainties to the early reservoir evaluation of low permeability gas reservoirs in the lower sub-block 8 of the Su-x well in the Sulige Gasfield, thus failing to finely characterize reservoir characteristics . How to fully reflect the uncertainty of the reservoir evaluation process and effectively expand the difference of evaluation results has become the key to improve the reservoir evaluation results. Taking the degree of membership as a link, according to the idea of multi-information overlapping, the fuzzy comprehensive evaluation and the gray relational evaluation method in the uncertain method are organically combined to improve the internal algorithm differentially, and a more effective fuzzy-gray comprehensive evaluation method is established . The example application shows that the new method not only improves the fuzziness and grayness of reservoir evaluation in the study area, but also improves the discrimination of low permeability reservoirs and improves the accuracy of reservoir description. According to the improved classification results of reservoirs, four types of reservoirs are divided into the lower sub-section of box 8, of which type I and II are favorable reservoirs. Compared with the past contiguity, the distribution of the reservoir in the plane is more elaborate than that in the past. The reservoir types have better distinction and closer to the law of development of the river sediments and geological knowledge base. Compared with the existing practice and geological understanding Also roughly matched. This method can guide the exploration and deployment of gas field quickly and effectively and provide a new idea for the evaluation of similar low permeability reservoirs.