Oil Reservoir Geological Modeling Of Fuyu In Daqing Aobaota Oilfield

Aobaota oilfield is located in the south of Daqing placanticline, north of Putaohua oilfield, East and west sides, respectively, and in Sanzhao sag, Gulong sag of adjacent, the overall presentation north-south strip nose like structure. The West Wing in Aobaota tectonic Gulong sag plunge on the slope structure tendency of North east. The upper part of Fuyu oil layer is in contact with the mudstone of the Castle Peak, and the bottom is contacted with the mudstone in the four section of the spring. Aobaota oilfield Fuyu reservoir is a shallow river delta deposition, belt, intermittent banded and reticular water distributary channel sand body is the main reservoir. The effective porosity of Fuyu oil layer is generally distributed between 8% and 15%, and the permeability is generally distributed in 0.1 ~ 10 ×10-3μm2, which is a low porosity and extra low permeability reservoir.Aobaota oilfield after rolling exploration and development for many years, expanding the scale of oil. But with the development of the deepening, the production conflict began to become prominent. In order to improve the current production status, tapping the potential of remaining oil potential, enhance oil recovery, need the geologic features of the block to have a whole and deep understanding. The establishment of a 3D visual geological model can provide the geological basis for the development of correct development programs and technical policies to achieve the purpose of economic development.Building reservoir geological model of Fuyu oil layer can clearly show the structural features of Aobaota oilfield Fuyu oil layer, and to deepen the understanding of the characteristics of sand body distribution and quantitatively reflect the distribution of borehole and within a certain range around the actual distribution of sand body and reservoir parameters, and the law of distribution of interwell sand body and reservoir parameters prediction. After the completion of the reservoir geological model of porosity, permeability and saturation data can be directly output to the eclipse software, to provide the basis for reservoir history matching. Help clarify the distribution of the remaining oil, to provide technical support for the remaining oil in the late.According to the lithology and electrical characteristics of Fuyu oil layer, the Fuyu oil layer is divided into six small layers, the six small layers are F11, F12, F13, F21, F22 and F3. The thickness of F11 is about 35 ~ 50 m, and the bottom of the roof is mainly composed of gray, purple and red brown mudstone, with a small amount of gray thin sandstone. The thickness of F12 is about 25 ~ 45 m, and the lithology is mainly green mudstone and brown sandstone. The thickness of F13 is about 30 ~ 45 m, and the lithology is mainly green mudstone and gray sandstone. The thickness of F21 layer is about 30 ~ 50 m. F21 small layer is mainly composed of gray sandstone and green mudstone. The F22 formation thickness is about 30 ~ 45 m, and the main lithology of the F22 layer is purple sand, silt and green mudstone. F3 small layer thickness of 50 ~ 80 m. F3 oil group with purple, purple red mudstone based, sandwiched between 2 to 3 purple red sandstone.In the division of sedimentary facies, the sedimentary facies of the area is divided into the basis of lithology and logging curve characteristics of the study area. The sedimentary environment in the area of the area is lacustrine delta environment. The sub facies of this area is divided into delta plain and delta front. The sedimentary microfacies of the delta plain are divided into flood plain, water natural levee and water diversion channel. The sedimentary microfacies of the delta front distributary channel, water for underwater natural levee and underwater distributary channel. At the completion of the vertical sedimentary micro facies, combined with the actual needs of the reservoir geological modeling, the plane will be deposited in the micro phase divided into distributary channel, Kawa Masa and interchannel sludge. Diversion channel corresponding water diversion channel and underwater distributary channel, interchannel sand water corresponding to the natural levee and flood levee, Hejian mud under the corresponding flood plain and water shunt Hejian. Fuyu river reservoir sand thickness is generally greater than 2.0m, the thickness of sandstone is about 1.2m River diversion. We determine the boundary between the qualitative and quantitative criteria, and make the advantage of sedimentary facies about the 6 small layers in the study area.We interpretFuyu oil layer well logging datausing natural gamma curve calculation of shale content, divided into sand shale formation. Then the volμme of rock physical model is established, with the sound wave curve, formation resistivity curve, each layer of reservoir pore porosity, permeability and saturation data. The porosity of Aobaota areas of Fuyu oil layer average is 10.71%. The average value of the permeability is 3.18 ×10-3μm2 and oil saturation of average value is 24.46%. Fuyu reservoir Aobaota areas belong to low porosity and low permeability reservoir. Fuyu oil saturation is low, the oil reservoir basically belongs to the oil-water layer. The lower part of the sand body oil saturation is lower, which belongs to the oil bearing layer.We establish the reservoir geological model of Fuyu oil layer. First of all, the small layer data and fault data Aobaota Fuyu oil layer structure model is established, then in sedimentary micro phase under the control of a sand body model, finally using logging data in sedimentary micro phase control to establish the model properties. From the model, the porosity, permeability and oil saturation of F11 small layers are the highest, and the porosity, permeability and oil saturation of F13 small layers are the lowest.