The Formation Evaluation Of H₁Oil Set In HSS Oil Field

HSS field is located in the northwest in Zhungeer Basin. H₁oil set is about23.2km²inthe Permian Pingdiquan group.My paper is aimed to research H₁reservoir of the explorationarea, using multidisciplinary knowledge, especially the method of fine reservoir description,studied the fine sedimentary facies, diagenesis, physical property characteristic and reservoirheterogeneity, have been researched evaluated of H₁reservoir, provided a reliable theoreticalbasis to the continued development.Strata thickness of H₁reservoir subject to regional variation, thinning regularitily fromnorth to south, there are5marker beds in the range of oil field. According to the marker beds,the H₁oil reservoir is divided into three sub-groups,H₁¹,H₁², H₁³, Further divided into7smalllayer. H₁¹sub-group is subdivided into H₁^1-1, H₁^1-2two small layer, and H₁²sub-group issubdivided into H₁^2-1, H₁^2-2,H₁^2-3three small layer, H₁³sub-group is subdivided into H₁^3-1,H₁^3-2two small layer.Under natural gamma ray and resistivity logging curves, study on logging mode, identifydelta front, delta front mouth bar, delta front sheet sand, shallow lake deposition. On the basisof the sedimentary microfacies of single well, from H₁³sub-group to H₁¹sub-group,sedimentary environments are shallow lake sedimentary, delta front sedimentary, shallow lakesedimentary, delta front sedimentary, shallow lake sedimentary.The rock types of the reservoir consists mostly of light gray fine sand, followed by asmall number of sandstone and Siltstone. Diagenesis mainly ranged from compaction,Pressure solution,cementation. Average porosity of reservoir is4%²0%, averagepermeability is-0.003⁴00×10^-3μm². By reservoir heterogeneity study found that the oil andgas distribution in both vertical plane and horizontal plane exist in varying degrees ofimbalance; classifying and evaluating the H₁reservoir comes to the conclusion that the mainpart of H₁reservoir belongs to the low permeability.