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Array electric imaging logging based reservoir oil-water identification method and system

An oil-water identification and electro-imaging technology, applied in the field of identification systems, can solve the problems of non-linear resistivity and non-monotonic distribution simulation of fresh cement slurry invading oil layers.

Active Publication Date: 2012-09-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0006]4. Based on the "four-parameter inversion" method of array electrical logging, although the formation model is a three-segment formation model, the part of the invasion zone is a linear monotonous change model , does not meet the requirements of nonlinear and non-monotonic distribution simulation of resistivity of fresh water slurry invading reservoir;

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specific Embodiment approach

[0045] attached figure 1It is a flow chart of reservoir oil-water identification system and identification method based on array electrical imaging logging. It mainly consists of 1 fine division of well logging intervals; 2 reading of characteristic values ​​of well logging curves; 3 determination of initial values ​​of formation parameters; 4 simulation of formation electric logging response; Sectional reconstruction composition. The fine division of well logging intervals mainly realizes automatic stratification based on array electrical logging data, and determines the layer interface and layer thickness; reading the eigenvalues ​​of well logging curves realizes the reading of eigenvalues ​​of layered array electrical logging data; The value determination is mainly based on the layer thickness and formation resistivity eigenvalues ​​to preliminarily estimate the formation parameters; simulate the formation array electrical logging response using geometric factor method and...

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Abstract

The invention relates to an array electric imaging logging based reservoir oil-water identification method and system. Aiming at the resistivity distribution characteristics of mud-invaded formations, a 'five-parameter formation model' is established, which is adapted to the requirement for simulating the resistivity distribution characteristics of different mud types and different invaded formations, and is pioneering in the aspects of forward-inversion models and processing methods of array electric imaging logging; and based on a 'five-parameter inversion' method for array electric imaging logging, an operation of carrying out resistivity distribution profile reconstruction on mud-invaded formations is performed, which reflects the actual differences between different resistivity distribution characteristics or change rules of mud-invaded oil formations or water formations. The method has stronger practicability, and is pioneering in the actual application aspects of qualitative identification and quantitative calculation on reservoir fluid properties.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration of oil and gas resources, and is mainly used for the reconstruction of resistivity distribution of mud-invaded strata, and then for the identification method and identification system of pore fluid identification. Background technique [0002] Well logging is an important field of earth science and one of the important engineering technologies for oil and gas field exploration and development. In the exploration and development of oil and gas fields, it is of great significance to use logging data for reservoir fluid identification, reservoir parameter calculation and productivity evaluation, among which electrical logging is the most important core technology for oil and gas evaluation at present. However, the apparent resistivity information provided by the actual electrical logging is quite different from the real situation of the formation. In particular, the resistivity distri...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/002E21B47/00E21B49/00
Inventor 邓少贵范宜仁陈华李虎李智强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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