| The buried hill fracture-vuggy reservoir include three types of reservoir space, and the structure is complex.The plane and vertical of the reservoir exhibit the property of being anisotropic and heterogeneity.Fluid flow in the fractured vuggy medium flow law is difficult to describe.The fractured-vuggy carbonate reservoir is a special reservoir, and the sandstone reservoir medium characteristics is different from the fractured-vuggy reservoir. The sandstone reservoir simulation technology is not suitable to fractured-vuggy carbonate reservoir numerical simulation.A right understanding of the buried hill fractured-vuggy carbonate reservoir fluid-flow mechanism is very important.Selecting a suitable numerical simulation model is good at simulating and predicting oilfield development plan, adjusting oilfield development plan, reducing oilfield development risk, tapping potential of remaining oil.Using the study provides the reasonable numerical simulation model.In this paper, the H Oilfield X32Block as an example,describing the reservoir structure, fault distribution, physical characteristics, reservoir space characteristics, the relationship between the formation porosity and permeability. Matrix porosity is characterized by low porosity and permeability, but as a main reservoir space, it is distributing wide in the buried hill fracture-vuggy reservoir; The vuggy is characterized by high porosity and permeability, it can be used as the main flow path and storage space; The fracture with low porosity and permeability characteristics, as the main flow path in the formation.The study analyze the relationship between the Reservoirs-Seepage medium combinations and single well production dynamic characteristics and combined with the results of previous studies, analysis of three kinds of reservoir permeability medium oil-water flowing low. According to the buried hill fracture-vuggy reservoir fluid flowing characteristics, combined with the overseas and domestic research status of numerical simulation technology, this paper puts forward the reservoir numerical simulation equivalence principle. The paper will comparative analysis of four kinds of numerical simulation model(Double Medium model, Multiple Medium model, Equivalent Continuum Media model, Discrete Medium model) principle and applicable scope. Double Medium model cannot accurately describe the channeling flow of between cave-pore-fracture mediums. Discrete Medium model needs large amount of calculation and the complexity of geological model. Equivalent Continuum model use the classical continuum model theory, namely porous media seepage theory. This theory considers all the flow of fractured-vuggy reservoir is the bedrock of Darcy linear flow, does not consider the cave and fractures flow condition, so this model does not need much parameters, reduce the system error,and improve the computational efficiency of numercal simulation. Combining to the reservoir characteristic parameters (well logging and core test results), the study calculates the Equivalent characterization of volume scale, the equivalent porosity value and the equivalent permeability value, and provide the reference basis for reservoir case analysis in dynamic production history matching reasonable adjustment. In the study, this paper builds The X Oilfield X32block X321reservoirs and X33reservoir geological model, analyzes all of the single well water cut change characteristics and the cause of water, and divides water types into Absolute Oil type, Slowly Rising type, Terraced up type, Repaid Rising type. The paper accords to making the single well water type classification of X321and X33reservoir history matching. Using the simulated calculation results by history matching model analyzes the remaining oil target position in space of the reservoir. The research results can be the equivalent continuous medium model applied in the buried hill fracture-vuggy reservoir.Through this thesis, the Equivalent Continuum model is applied to The buried hill fracture-vuggy reservoir. |
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