Study On Geological Model Of Lower Guantao Formation In Second District Of Gudong Oilfield

GuDong oil field is located in the Kenli County,Dongying city of Shandong province,the north side of the beach area of the Yellow River.GuDong oil field second district is located in the Gudong oilfield drape anticline northwest,its eastern,northern is adjacent to sixth,third district, The southeast is the seventh district.lower guantao formation oil reservoir of this area is found less and its distribution is scattered,so it did not cause enough attention.this region has entered extra-high water cut period,The problems about structural system is not clear,the original geological understanding and development situation are not contradictory,rapid increase of water cut,severely restrict the reservoir development and production.In view of the objective interval problems,based on comprehensive analysis of sedimentary features,structural characteristics,and reservoir characteristics established the three-dimensional geological model of the area,making reasonable scheme for the subsequent development of oilfield.The main idea is:base on the date of well logging,seismic,geology,to classificate and correlate strata, the tectonic features of the region, in order to establish the reservoir model of fault, structural and level. Through the analysis of the sedimentary characteristics of the region and deterministic modeling method,establish local sedimentary phase model and single sandbody model. Secondly, the sedimentary facies model and single sandbody model as constraints, to build the local porosity model, permeability model, saturation model and net to gross model. Finally, comparison of various constraint conditions of the model, and select the best model.Several achievements have been obtained as follows:(1)Comprehensive logging, geology and seismic data, using standard layer, layer partition layer,second district in Gudong oilfield lower formation 1 of 1-2 sand groups were subdivided into 8 layers.(2)Tectonic characteristics show that the study area is a normal fault segmentation, by two boundary faults, forming a graben tectonic style. The two area of Gudong oilfield lower formation 1 of 1-2 sand group belongs to braided river sedimentary system, distributary channel, the heart beach, flood plain facies.(3)According to log interpretation of reservoir parameters, makeing clear the reservoir parameter distribution, the study area of each layer are high porosity and permeability reservoirs, the sand thickness increases from top to bottom, there is a big difference between oil saturation, layer from top to bottom stability becomes worse, sandwich type in argillaceous interlayer and the physical properties, distribution the smaller range of calcareous intercalation.(4)Based on fine geology research, optimize modeling method, establish the Gudong secong district lower Guantao formation 1 of 1-2 sand reservoir geological model, will improve the accuration of model. Visual display of the fault model of reservoir, stratigraphic framework model, sedimentary facies model, single sand body model, the sedimentary facies and single sand body model for the establishment of the reservoir parameters(porosity, permeability, oil saturation, shale content) model, and the model will be proved to sparse wells and probability distribution consistency verification.