Distribution Characteristics And Controlling Factors In Yan’an Formation Of Reservoir Of Yan9at Wang Quze Eare In Jingbian

The Indosinian movement affects Ordos basin in the Late Triassic, making the basinuplifted and suffered weathering and fluvial erosion effectsatthe extended set of top, formingtheancient landscape gully aspect and hilly topography. The Jurassic strata deposited on it andbecomes the main production layer of the basin.Located in the basin, Jingbian Wang Quze area is still in the exploration stage. Analyzedfrom the proven reservoirs, the reservoirs are mainly distributed in Yan’an formation of Yan9oil-bearing strata, owning small area and reservoir connectivity is poor, which causes greatdifficulties to the oilfield exploration, but the reservoir physical property is good and the wellyield was generally higher, with the characteristics of "small and fat". Therefore, based onprevious research results and existing data，the distribution characteristics of basic geology,reservoir in this area of Yan9reservoir tectonic, sedimentary, reservoir and fundamentalgeneralgeology and distribution of oil reservoir are systematically analyzed.Aspects of thecontrol of reservoir distribution are discussed mainly from the top of structure, paleogeographybefore sedimentary and sedimentary faciesin order to determine themain control factors of thereservoir distributionand provide a theoretical basis for exploration and development. Researchresults show that: the study strata superface structures is generally westward dippingmonoclinal structureand develops scale of nose shaped upliftand incised valley, slope and oldhigh of3ancient landform unit. The study area develops meandering river facies almost fromNorth to West and the reservoir rock type is mainly the lithic arkose, low to medium hole, highpermeability reservoir. Reservoir types are mainly structural-lithologic reservoir andlithologicupdip block reservoir, mainly controlled by the deposition of palaeogeomorphology,nose shaped uplift and sedimentary facies, from which sedimentary facies have the mostobvious affection. Found reservoirs are based on the side stand reservoir sand dam facies, lowamplitude structure,nose shaped uplift, is also another important factorof control of oil and gasdistribution and differentiationaffected by the dual role of palaeogeomorphology anddifferential compaction.