【摘要】 针对常规地质建模方法在辫状河相致密砂岩气藏适用性差的问题,以鄂尔多斯盆地苏里格气田为研究对象,提出"多期约束,分级相控,多步建模"建模方法。该方法采用测井约束地震反演自然伽马场,并在先验地质信息控制下建立自然伽马模型;回归自然伽马模型与砂岩概率的关系,建立砂岩概率体,并通过多点地质统计学方法建立岩石相模型;然后建立岩石相、辫状河体系双重控制下的沉积微相模型;最后综合沉积微相、有效砂体规模、储集层参数分布等因素,建立有效砂体模型。建模中尽可能将地质约束条件加入地质模型,增强了井间砂体预测的精度,提高了三维地质模型的可靠性,为天然气开发提供更可靠的地质依据。图6表4参20更多还原

【Abstract】 Considering the poor applicability of conventional geological modeling to tight sand gas reservoir in braided river facies, a modeling method of "multi-stage constraint, hierarchical facies and multi-step models" was put forward taking Sulige gas field in Ordos Basin as the study object. The method obtains the GR field by seismic inversion constrained by logging data, and GR modeling is built under the control of the prior geological knowledge; the relation regression is realized between the GR model and the sandstone probability, sandstone probability modeling is built, and rock facies modeling is obtained by multi-point geostatistics theory; sedimentary microfacies modeling controlled by rock facies and braided-river-system is made; and eventually build effective sand body modeling by integrating sedimentary microfacies, effective sand body scale and reservoir properties distribution. The research method discussed in this paper has put geological constraints into the model as far as possible, enhanced the inter-well sand body predictability and improved the precision rate, thus it can provide a more reliable geological basis for gas reservoir development.更多还原