The Pore Texture And Evaluation Of N₁ Reservoir In Wudong Slope, Hailaer Basin

Pore texture of Reservoir rock is the main factor on the reservoir capacity of reservoir fluids (oil, gas and water) and the exploitation of oil and gas resources,the definition of rock pore texture is the key to add oil and gas productivity and enhancing hydrocarbon recovery. The N₁ reservoir in Wudong Slope of Hailaer basin in general belongs to low porosity and low permeability reservoir, because of low permeability reservoir with the difficulty in an effective use in economic, study on physical properties and pore texture is great significance to evaluate and select the geological movable reserves, oil and gas development direction and investment decisions.N₁ reservoir is fine divided into four sand sets, 14 mbr through the application of theogram, ES curves characteristic, and the cycle of sedimentation delineated.Through coring observation and identification, N₁ reservoir is mainly medium sand and arentilla, rock type of quality is defined lithic arkose, the main filler is mire and carbonatite. The clay mineral is goeschwitzite, and then is andreattite.The main pore type in N₁ reservoir is the origin intergranular pore, intergranular dissolved pores, intragranular dissolved pore (feldspar dissolved pore and cuttings dissolved pore), split dissolved pore and casting pore; cementation is mainly pore and pore- thin film.Rock physical property analyse indicates that the porosity of N₁ reservoir in Wudong slope is mainly distributed in the 10²0%, averaging at 13%; permeability is mainly distributed in the interval 0.1²0.0×10^-3μm², average to 12.9×10^-3μm².Through the data of CP curve which is obtained by using the mercury intrusion method, we can see that the throst in N₁ reservoir, on the overall, is relatively concentrated, better sorting and mainly coarse. The optimization of pore texture parameters are used to evaluate the N₁ reservoir on plane and vertically, and the reservoir texture was divided into four different borefild on plane, and 4 reservoirs separate into 3 type vertically.The relation with oil, gas, water pattern and study of sedimentary microfacies indicated that the pore structural characteristics of the reservoir have closely relationship with oil, gas, water pattern and sedimentary microfacies.