Study on Heterogeneity of Chang 2,Fuchang Development Unit,Yanchang Oil Area
Taking the Chang 2 reservoir in the Fuchang development unit of the Yanchang oil area as the research subject,its heterogeneity was analyzed from both macroscopic and microscopic viewpoints using core and logging data.The findings indicate that the permeability of the Chang 2 reservoir in the study area exhibits a predominantly positive rhythmic pattern in the longitudinal section,with the interlayers primarily consisting of muddy interlayers,resulting in a weak overall layer heterogeneity.The layering coefficients for the three sub-layers are low,septa development is average,indicating moderate interlayer heterogeneity.Additionally,the planar distribution of the sand body and the physical properties of the reservoir are influenced by the sedimentary phases and are characterized by a strip-like pattern,demonstrating strong planar heterogeneity.Furthermore,there is a diversity of pore throat types with high sorting coefficients,which is also characteristic of the Chang 2 reservoir in the Fuchang development unit of the Yanchang oil area.Concurrently,the presence of various pore throat types and large sorting coefficients suggests a strong overall microscopic heterogeneity
Yanchang oil areaChang 2 reservoirheterogeneityFuchang area
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