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鄂尔多斯盆地塔巴庙区大牛地气田块致密砂岩储层中高阻气层和低阻气层并存,低阻气层也可形成高产,仅依靠传统的阿尔奇公式计算含气饱和度或根据电阻率将会低估或漏掉该类气层。通过对该区低阻气层和高阻气层进行分析对比,从储层微观孔隙结构、储层物性和粘土矿物含量等方面分析了低阻气层的成因,认为泥浆侵入和微孔隙发育是形成低阻的主导因素。储层具有较好的孔隙度和渗透率或微裂缝的存在是泥浆侵入的前提条件;粘土矿物(绿泥石)的含量、类型和分布对微孔隙的发育具有重要作用。
In the Daniudi gas field of the Ordos Basin, the tight gas reservoirs in the tight sandstone reservoirs coexist with the high gas barrier and the low gas barrier. High gas production can also be achieved with the aid of the traditional Archie formula for gas saturation or according to the electrical resistance The rate will underestimate or miss this type of atmosphere. By analyzing and comparing the low gas barrier and the high gas barrier in this area, the genesis of the low gas barrier is analyzed from the microscopic pore structure, reservoir physical properties and clay mineral content. It is considered that mud invasion and micropore development are The formation of a leading factor of low resistance. The existence of reservoirs with good porosity and permeability or micro-cracks is a prerequisite for mud invasion. The content, types and distribution of clay minerals (chlorite) play an important role in the development of micropores.