Yanchang Formation Geological Research Of QuJiagou Oil Region In WaYaobao Oilfield

In this paper, Qujiagou area in Ordos Basin on the basis of exploration and development of existing information,previous research results fully absorbed in sedimentology,sequence stratigraphy basic principles as a guide, a variety of research methods utilization geophysics, geochemistry,combined outcrop,core analysis,drilling and logging data,systematic study of the Qujiagou oil region Yanchang oil group regional stratigraphic, structural status quo, fine contrast zone marker layer,focusing on the Chang 4+5 and Chang 61 both have a long hydrocarbon shows reservoir. Good geological basis for oilfield development.By analyzing rock types,logging,sand flat distribution patterns in this area,Together with the peyrologic studing and understandings of the property and the controls of the reservoirs, summed up the reservoir sedimentary micro-facies relationship between heterogeneity.Through these experimental methods such as core observation, svanning electron microscope identification results analysis, combined with previous studies, comprehensive analysis of the rock types in the study area oil group, interstitial material characteristics, pore structure characteristics, structural characteristics, and the main diagenesis and reservoir properties features in-depth and comprehensive analysis.Comprehensive analysis of rhythm changes in the study area reservoir permeability, the reservoir heterogeneity parameter type, inner layer interlayer electrical characteristics etc, and to study heterogeneity characteristic plane, on this basis to achieve a comprehensive reservoir classification, Evaluation. the Chang 4+52 and Chang 61 are a Class Ⅰ and Ⅱ reservoir, Mainly developed in distributary channel sand, it was good, large sand thickness, effective reservoir thickness of the reservoir. Volumetric method to calculate the Chang 4+5~2 and Chang 6~1 geological reserves 469.9 × 10~4t, laminated bearing area 21.04km~2.