Rich Yellow Acreage Locust Tree Zhuang Area Chang6 Reservoir Description

The Huaishuzhuang region of Fuhuang exploration area located in the south of Yan’an City, across four county as Ganquan, Fuxian, Huanglong, Huangling. The structure is located in the southern Yishan slope of Ordos Basin, performance for the west-dipping monocline, strata is relatively flat, exploration degree is relatively low.Combining with research area regional geological material、core material、logging data, using sequence stratigraphy、sedimentary petrology、petroleum geological、geophysical well logging、oil and gas field development geology、oil and gas field underground geology、 petrophysics and reservoir description for guidance, study stratigraphic features、sedimentary characteristics、the types of sedimentary facies、sedimentary facies、reservoir characteristics、 reservoir control factors、reservoir comprehensive evaluation、reservoir features and reservoir physical characteristics in the study area. Main understanding obtained as follows:1.The study area is located in Ansai Delta-depositional System, delta front and prodelta are primarily sedimentary facies, underwater distributary channel sandstone and turbidite are primarily reservoir sand body types.2. The reservoir rock is high maturity, Lithic arkose、Feldspathic lithic sandstone、 Feldspar lithic quartz sandstone of Flour-fine sand are primarily reservoir sand body, small pore-smaller throat type and fine holes micro-fine throat are main reservoir type.General property is bad, performance for low pore-low permeability—low pore-lower permeability and stronger heterogeneity.3. Reservoir saturation pressure difference is small, reservoir is medium acid sensitive、 weak-medium alkali sensitive、weak-medium salt sensitivity、weak water sensitivity、weak-the constant speed quick, reservoir rock is partial hydrophilic, but have a small amount of reservoir rocks with partial lipophilic.