| There was a considerable amount of oil and gas resources on the southern slope belt of Dongying Sag, and it did good to increase production of Shengli oil field in a long time. Shahejie Formation is the main layer of Shengli oil field, its research degree is higher, but the research level of the four member of the Shahejie is relatively weak, and many scholars have different opinions about the sedimentary and reservoir characteristics. Therefore, this paper was focused on the fourth member of Shahejie Formation. According to the fine stratigraphic classification and correlation and the systematic analysis of petrological characteristics, logging facies and seismic facies and facies marks, it concluded the sedimentary system types and the reservoir characteristics and main controlling factors of the four member of Shahejie Formation in the southern gentle slope.The study found that the four member of Shahejie Formaion of south slope in Dongying sag mainly include alluvial fan, fan delta, delta,shore shallow lake depositional systems. The sandbody on the southern gentle slope zone is dominated by feldspar sandstone and lithic feldspar sandstone and the mainly types of diagenesis include compaction, cementation, dissolution.The main reservoir physical property is medium to high porosity, medium to low permeability.Sedimentary environment determines the type of sedimentary sandbody, the different sedimentary types of sand bodies have obvious difference of reservoir physical characteristics, diagenesis is the key factor to affect the reservoir physical properties.With comprehensive analysis of sedimentary, diagenesis and tectonic factors of the reservoir, it was concluded that the four member of Shahejie formation in the southern gentle slope belt of Dongying Sag, favorable sand body types include braided channel sand body and water diversion channel sand body and bar sand body in the shore of shallow lake. |
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