The Oil Reservoir Of Mao Jiahe Oil Reservoir In H Oilfield

Mao jiahe oil region in H oilfield is located in the Northern Shan`xi slope of ordos basin. The main reservoir is Chang4+5 and Chang6 of Yanchang Formation.This research is based on well logging, mud logging, thin section materials, SEM and experimental test combined with testing for oil and production test results data to in-depth study the reservoir geological characteristics and reservoir features and set up 3D geological model, providind geological basis for the next step of exploration and development of the oilfield.Chang 4 + 5 and Chang 6 reservoir of the study district is divided into Chang 4 + 5u,Chang 4 + 5d, Chang61, Chang 62, Chang 63 and Chang 64 six sublayers to analysis. Main structure form of the study area is a west monoclinal structure, but in some area exist small nose long, small anticline and syncline, small hollow.etc micro structures. The sedimentation type is Delta plain subfacies deposition, including three types of sedimentary microfacies: water distributary channel, river side edge and distributary bay; main lithology is fine-grained feldspar sandstone, the reservoir physical property is low permeability-low porosity or extra low permeability-extra low porosity reservoir; the pore type is mainly intergranular pore and dissolved pore; the reservoir sensitivity characterize as "two weak &four medium"; the reservoir heterogeneity show middle; the fracture direction in the study area mainly is north-east and north-west direction and the fracture azimuth is 40$~75$.Oil and gas distribution is mainly controlled by the reservoir lithology and physical property and the reservoir is lithologic deposit drived by elastic-dissolved gas.On the basis of above research to establish the logging interpretation model of the study area and the standard of the effective thickness lower limit.By using volumetric method to calculate reserves is primary oil 763.1 x 104 t, dissolved gas 11446.0 x 104 m3.