鄂尔多斯盆地北部上古生界致密砂岩气藏储层建模

鄂尔多斯盆地北部上古生界致密砂岩气藏普遍具有岩性致密、低孔、低渗的地质特征,其地球物理异常往往较为微弱,先验地质模型特征模糊、地球物理数据体约束性差,从而导致最终构建的储层地质模型不能充分体现致密砂岩气藏储层较强的非均质性特征。为了解决该区致密砂岩气藏储层建模中遇到的实际问题,提出了将地质研究和地震数据信息充分结合起来的储层模型构建方案。在该方案中,在储层地质研究的基础上构建储层地质知识库,量化先验地质认识;通过地震属性优化和储层地震反演,构建对储层参数较为敏感的地震约束信息库;通过精细速度模型构建,将时间域和深度域的数据信息很好地进行匹配;通过构造建模、沉积相/岩相建模、相控下的连续型储层参数建模,建立起完备的致密砂岩储层地质模型。通过该方案在大牛地气田致密砂岩气藏储层建模中的实施和应用,证实了该方案的有效性。

Reservoir modeling of tight gas sands in the Upper Palaeozoic of the northern Ordos Basin

The tight gas sands in the Upper Palaeozoic in northern Ordos Basin feature in tightness,low porosity and low permeability.Their geophysical anomalies are often insignificant,characteristics of priori geological models are ambiguous,and constraints on corresponding geophysical data volume are poor.For these reasons, the final reservoir model can not reflect exactly the heterogeneity of the tight gas sands.In order to solve these problems in modeling of the tight gas sands in the study area,geologic research...