Study On Reservoir Characteristics Of 2 Sand Group Of The First Member Of Shahejie Formation Zheng 36 District In Wangzhuang Oilfield

The structure of Zheng 36 District is located in the steep slope zone in the north of dongying sag of the west,which is a complex oil field of the Archean bedrock Qianshan reservoir and the third system lithologic stratigraphic reservoir.The reservoir is mainly composed of biological dolomite and gravel sandstone.Through previous studies found that the area 2 sand group still has many problems,2 sand section was not subdivided into small layers,overlap relationship and lithological change is not clear,each small layer structure characteristics,reservoir characteristics,oil layer characteristics,such as understanding unclear,inside the reservoir lithology change is big,the planar and vertical oil content difference is big,need to be determined according to different lithology oil standard,calculation of reserves.This paper mainly through the comparison combined with the application of seismic data in logging curve logo layer under the control of"Different lithofacies in the same period"phase contrast pattern,balance oil and water relations,has carried on the fine stratigraphic contrast to the study area and division,the 2 sand group subdivided into six small layers,determines the distribution characteristics of each small layer and overlap relationship;By means of the combination of drilling data and 3d seismic data,the tectonic characteristics and fault development of the block are studied,and the distribution of the oil layer in the two sand groups is explained by the microstructure and the comparison of the stratiform.Based on coring data and analysis of drilling and logging data,to the study of sedimentary characteristics in the area,the characteristics of reservoir distribution,physical properties,microscopic pore structure,heterogeneity,wettability,sensitivity and so on has carried on the detailed research;Lithology is complex,in the study area according to the testing,test data,core analysis data and logging data,respectively,to determine the sandstone and biological dolomite reservoir effective thickness standards,combined with the structure,oil exploration information and study the 2 sand group of each small layer reservoir distribution characteristics,find out main small layers of oil/water interface and oil-water systems,fluid properties and flow patterns.According to the comprehensive study,the two sand groups were divided into six small layers of calculating reserves,each of which was calculated by the two types of reservoirs,including gravel and biodolomite.The geological reserves of the 2 sand group in the study area are 585.889×10⁴ t,of which the geological reserves of the sandstone region are 357.58×10⁴ t,and the geological reserves of the white cloud rock area are 228.31×10⁴ t.According to the distribution of geological reserves of various small layers,E₃s₁2²,E₃s₁2³ and E₃s₁2⁴ are the main layers,which account for 83.5%of the total geological reserves.The results show that the research area has abundant geological reserves and large reserves of small deposits,which have good development value and provide geological basis for further exploration and development in this area.