A method and apparatus for identify reservoir types in low permeability oilfield

Abstract

A method and apparatus for identify reservoir types in a low permeability oilfield include determining a correspondence relationship between each evaluation index and a preset reservoir property basedon a clustering result between a plurality of evaluation indexes of a target reservoir in that low permeability oilfield; Determining a target reservoir property and at least one auxiliary reservoirproperty currently corresponding to the low permeability oilfield based on the oilfield development stage to which the low permeability oilfield currently belongs; And selecting at least one target evaluation index corresponding to the target reservoir property according to the corresponding relationship between each evaluation index and each reservoir property, and applying the pre-acquired reservoir division standard and the target evaluation index to determine the reservoir type to which the target reservoir belongs. The present application can effectively improve the classification accuracy, pertinence and universality of the low permeability oilfield reservoir from the actual situation of the low permeability oilfield, and further can improve the prediction accuracy of the low permeability oilfield reservoir productivity.

Description

technical field [0001] The present application relates to the technical field of petroleum detection, in particular to a method and device for identifying reservoir types in low-permeability oilfields. Background technique [0002] With the increase of proven low-permeability oil reserves and crude oil production year by year, low-permeability oil and gas fields have become important in oil and gas development. The permeability of low-permeability oilfield reservoirs is usually (0.1-50)*10^-3μm2. The unproduced reserves of low-permeability reservoirs account for a relatively high proportion of the total unproduced reserves. For low-permeability reservoirs, how to screen out relatively high-quality reserves, formulate development plans, and determine the direction of technical research is particularly important. Due to the characteristics of low-permeability oilfield reservoirs such as poor accumulation, low permeability, complex pore structure, and severe heterogeneity, in t...

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Problems solved by technology

[0004] However, the existing low-permeability oilfield reservoir classification method is mainly based on independent static and microscopic parameters, lacks auxiliary parameters, and does not take into account the current development stage of low-permeability oilfield reservoirs. Differences in geological characteristics also limit the versatility of reservoir classification methods, and the applicability of the same classification method varies greatly in different blocks

In addition, the existing classification methods of low-permeability oilfield reservoirs are not well integrated with macroscopic dynamic data such as oil testing, and the acquisition of existing classification parameters needs to be based on a large number of core analysis tests, making it difficult to popularize the classification method. Therefore, the existing Due to the difficulty in evaluating low-permeability reservoirs, the low degree of integration with development dynamics, and the one-sided representation of reservoirs by independent parameters, the classification method of low-permeability oilfield reservoirs will result in low accuracy of reservoir classification results and cannot meet the requirements of low-permeability reservoirs. Practical Evaluation Requirements in Permeable Oilfield Reservoir Development

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