The Research Of Fuyu Reservoir Modeling In V Block Xinli Oilfield

Five Block, in the central of Xinli oilfield, was invested into development in1984. In the early time,300meters from the inverted nine-spot square pattern was used and wells array direction was North East67.5degrees. In1988, the amounts of parts of the well array were increased in150meters. At the same time, in the water injection patterns, the higher water wells were reverse injected. In three years of1995,1997, and2005, the well array further adjustments were conducted. Now, Main injection patterns are in the row of134meters linear spacing. Northern of twenty blocks are mix of the two rows of water wells and three oil wells and water injection wells network with95meters linear spacing.Until June of2011, the total numbers of wells are311, in which228oil wells,166open wells and have an oil production of36,000tons a year, cumulative oil production of36,363,000tons, oil recovery rate of0.69%, recovery of34.38%, recovery of88%in the extent of recoverable reserves, remaining recoverable reserves of oil production rate of1.77%, and average water cut of84.7%. The total numbers of water injection wells are83and open wells67. It have day water injection of2883cubic meters, the average single well injection of43m3,499,000m3water injection in a year, cumulative injection of13,258,000m3, monthly injection production ratio of1.68, cumulative injection production ratio of1.55, deposit water rate of72.6%underground.Since scale production of oilfields in1984, along with in-depth development of oil fields, has entered the "high-yield water, high extraction" stage and the situation are enormous. With the increase of the static and dynamic data, the level of awareness is deepening and a variety of development issues is gradually increasing. So we to constantly adjust and improve existing research results. Since the distributions of the remaining oil fields are extremely complex currently, three-dimensional reservoir modeling of working area is necessary at this time. Through the study of the working area’s porosity, permeability and oil saturation, we can clarify the distribution of the remaining oil in order to guide the adjustment in the late development work and for further improve the recovery of residual oil.Under the guidance of geostatistics, high-resolution sequence stratigraphy and sedimentology, on the observation of core, we can figure out the distribution of sand stone and the type of sedimentary facies. Using the Fine monolayer partition and comparison method, we build a fine strata framework of the work area. According to the observation result of the core and log responses, we can confirm a criterion of lifhology-electricity corresponding relationship, mode of lithology-electricity transformation relation and mode of log facies. Then Interpretate manually for sedimentary facies of every well and every layer to make sure sedimentary facies distritution features.On the base of prior study, we can confirm the reservoir sand distribution in the space and build a3D geological model by Petrel. Combining the sedimentary faces we can set up a sedimentary model. Using geostatistics and stochastic simulation, the porosity, permeability and oil saturation modes are built. They are under control of sedimentary faces. Vacuate test on models are carried on. On combination of the late oil saturation, we can know the distribution of residual oil and profitable layer.After study the work area synthetically, we get such conclusions:1. Using the theory of high-resolution sequence stratigraphy and the principle of large to small sedimentary cycle and control by different levels, the large scale flooding layer is considered as a marker bed. That controls the sand group boundary. By making the coring well as standardized well, each layer’s boundary is set up. The Fuyu reservoir is divided into5sand groups and16layers. On the base of layer study, we divide Fuyu reservoir into32single layers.2. According to the sedimentary study, there are delta front and delta plain in the area. Delta front is made up of river under water, levee under water, estuary dam, thin sand between river and branch bay. delta plain is made up of river, subaerial levee, crevasse splay and flood plain.3. On the base of sedimentary micro faces study and layer contrasted framework, the3D geological model which is reasonable is built. After digitalize the2D sedimentary micro faces’boundaries, the definitive sedimentary model is built.4. Under the control of sedimentary faces, the porosity, permeability and oil saturation3D models are built.5. When it comes to test the model, we adopt the Comparison test method. Through comparing the profile with the old one which including all wells, we make a conclusion that the two profiles are nearly same and the model is reasonable and right. It is predictive well.6. After calculate the geological reserves, we know some layers’reserves are higher than other layers. They are1、8(1)、8(2)、14(1)、14(2). The whole reserves is about621.771×104t.Through this study, we set up a geological model which is match with the geologic situation and predict the distribution of residual oil. This offers an important evidence to the later development plan.