The Research On Hydrocarbon Enrichment Regularity And Advantageous Area Forecast Of Chang 8 Reservoir In WangPanshan Area

This paper investigates the Chang 8 group in Triassic Yanchang Formation of Wang Panshan area in Jiyuan oil field,Ordos basin.In the learning of sedimentary cycle,the bed of Chang 8 is subdivided into 4 sublayers,according to the obvious characteristic of log and that one's property of rock and the marker bed of K₁.Analysis the types of sedimentary facies and sedimentary microfaceies according to the combination of logging curves and sign system of sedimentary facies.It is considered that the subfacies of Chang 8 oil bearing Formation were mostly consists of delta front microfacies.This paper studying on the characteristics of Chang 8 reservoir with the combining macroscopical study and microcosmical study.Evaluate Chang 8 reservoir according to the study on petrology characteristics?physical property?salification characteristics and lithology-electric property relationship.On this basis,studying the reservoir heterogeneity of the most important potential area,analysis the interlayer heterogeneity?areal heterogeneity and in layer heterogeneity to confirm the range of profitability.Discussing the enrichment laws of oil reservoirs from 5 aspects.The widely distributed hydrocarbon source rocks?the effective sandbodies of delta distributary channel deposit?the relatively high permeability zone?excellent source-reservoir-cap rockassemblage and the effective traps are the basic key factors that make contribution to oil-gas accumulation.Based on the characteristics of reservoir which have been developed,predicted the favorable areas of Chang 8 oil bearing Formation according to the specific geological conditions and producing circumstance of study area.