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致密砂岩油储层的脆性研究是致密砂岩油地震预测的重要内容,需要引入合适的脆性指数来建立致密砂岩油储层的脆性评价标准。本文首先构建了各向异性致密砂岩油地震岩石物理模型;依据该模型进行了各向异性介质弹性常数的脆性敏感性分析,建立了新的脆性指数;并分别从脆性敏感性定量分析、岩石物理响应特征分析以及交汇图分析三个方面系统研究了新脆性指数在致密砂岩油脆性预测上的适用性。分析结果表明,新脆性指数较其它传统脆性指数,不仅其脆性敏感性高,而且更适合于致密砂岩油储层“甜点”区的脆性预测。
The study on the brittleness of tight sandstone reservoirs is an important part of the prediction of the tight sandstone oil. It is necessary to introduce a suitable brittleness index to establish the brittleness evaluation criteria for the tight sandstone reservoirs. In this paper, we first construct the petrophysical model of anisotropic tight sandstone oil. According to the model, the brittleness sensitivity of anisotropic medium elastic constants is analyzed and a new brittleness index is established. From the quantitative analysis of brittleness sensitivity, rock physics Response characteristic analysis and intersection graph analysis, the applicability of the new brittleness index to the prediction of tight sandstone oil fragility is systematically studied. The results show that the new brittleness index is not only more sensitive to brittleness than other traditional brittleness indexes, but also more suitable for the brittleness prediction of the “sweet spot” of tight sandstone oil reservoir.