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储层非均质性是影响剩余油分布及开发效果的重要因素,是油气藏开发方案调整与制订的重要地质依据。以DL油田USH层碳酸盐岩油藏为例,评价了储层垂向非均质及平面非均质。研究表明,区内隔层较发育,为致密隔层,电性特征表现为低伽马、低声波、低中子、高密度、较高电阻率,在有效地层分布范围内,隔层分布连片,纵向上对流体渗流有一定的阻隔作用。研究区主力油层孔隙度均一,平面上局部存在低渗带,总体上基质部分的非均质性不强;考虑断层共生裂缝,地层渗透率变化较大,表现出比较强的非均质性。研究结果对油藏水平井注水开发调整具有参考意义。
Reservoir heterogeneity is an important factor affecting the distribution and development of remaining oil, and is an important geological basis for the adjustment and formulation of reservoir development plans. Taking the USH carbonate reservoir in DL Oilfield as an example, the reservoir vertical heterogeneity and planar heterogeneity are evaluated. The results show that the interlayer in the area is well developed and is a dense interlayer with low gamma, low acoustic, low neutron, high density and high resistivity. In the range of effective stratigraphic distribution, the interlayer distribution Contiguous, longitudinal fluid seepage has a certain barrier. The main reservoirs in the study area are of uniform porosity and low permeability zone locally on the plane. Generally, the heterogeneity of the matrix part is not strong. Considering the fracture of the fault, the permeability of the strata varies a lot and exhibits strong heterogeneity. The results have reference significance for the development and adjustment of reservoir horizontal well water injection.