Comprehensive Evaluation And Reservoir Charaeteristies Of Chang6Oil-bearing Sets Of Yanchang Formation In Fanxue Oil Field,the Ordos Basin

Fan Xue Chang6reservoir oilfield, Ordos basin are typical of low permeability reservoir.At present, with the breakthrough of Chang6reservoir in petroleum exploration and rollingproduction of knowledge and information accumulated, Petroleum Geology problems and thedevelopment in the study area is becoming increasingly prominent, perplexes the oilfieldproduction and overall development. Therefore need to study fine geological feature andreservoir evaluation for understanding, make clear the exploration potential of the area, asdevelopment wells in the study area and technical studies for reference.This thesis studies were found on Fan Xue Chang6reservoir in Jiyuan oilfield. Based onthe study of geological, coring, well logging and production performance data, targets finestratigraphic division and correlation of the studied area and sand body distribution of research,sedimentary microfacies and reservoir heterogeneity characteristics,"four", reservoirclassification and evaluation.Research showed that, research Chang6storage layer can divided for chang61, andchang62, and chang63and chang64four small layers; overall constructed simple, renderingNortheast High, Southwest low, and development has must inherited of small nasal-like uplift;sand body is since southwest to northeast of article banded exhibition cloth, ductilitycompared good, plane Shang connected good, away from real source district near ofSouthwest Department sand body thickness big, to Northeast direction sand body variable thin,which chang61sand body thickness big, containing oily good, for the district main reservoir;research district for shallow Delta within front deposition, Deposition micro phase main hasunderwater distributary channel, and subsea natural barrier and subaquatic interdistributaryembayments.River is southwest to Northeast direction, to Northeast River disappeared; its intorock role main has pressure real pressure dissolved role, and cemented role, and account roleand dissolution role; chang6storage layer single sand body internal penetration rate ofchanges compared complex, has anti-rhythm type, and are rhythm type and by are, andanti-rhythm superimposed composition of composite rhythm type3species type, to composite rhythm type most general. Research district can using electrical property features to analysisand reveals lithology, and physical properties and containing oily, reservoir physical propertyand sand body thickness, and deposition micro phase and reservoir heterogeneity hascompared good of correlation; research district storage layer can divided for four class,respectively for I class, and II class, and III class and IV class, chang61storage layerintegrated evaluation figure see, I class storage layer main development in research districtCentral and West southern is North East-South West to of river sand body Center parts, storagelayer real good, pore type to dissolution hole and residual pore type pore mainly, poredistribution uniform, Connectivity is good, under the background of relatively highpermeability in low permeability reservoir of high quality reservoirs. Chang62study on thecomprehensive evaluation of reservoir reservoir evaluation of reservoir greatly reduced thescope of class I, spotty distribution in the area, mainly in the central region, Northwest of classII reservoirs range, except for small areas in Eastern, Central and southwestern reservoiroutside of class III, IV, the rest are for class II reservoirs.