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Quantitative identification of fractures and caverns based on core analysis and electrical imaging logging

A quantitative characterization and core analysis technology, applied in the fields of electrical/magnetic detection, radio wave measurement system, measurement device, etc. for logging records, which can solve the problem of affecting reservoir evaluation and prediction, and the inability to quantitatively characterize reservoir pores. Development and distribution characteristics, etc., to achieve the effect of improving prediction accuracy, reducing cost input, and improving enterprise efficiency

Inactive Publication Date: 2017-02-01
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0005] Limited by the number and thickness of coring wells, it is obviously impossible to quantify the development and distribution of pores, caves, and fractures in the reservoir quantitatively, and thus affect the evaluation and prediction of the reservoir.

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  • Quantitative identification of fractures and caverns based on core analysis and electrical imaging logging
  • Quantitative identification of fractures and caverns based on core analysis and electrical imaging logging
  • Quantitative identification of fractures and caverns based on core analysis and electrical imaging logging

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Embodiment Construction

[0032] The method of the present invention and the technical effects brought by it will be described in further detail below through specific embodiments in conjunction with the accompanying drawings, but it should not be construed as limiting the scope of the present invention.

[0033] The following combination figure 1 How to use the grid method to quantitatively count the parameters of core pores, caves, and fractures is described in detail.

[0034] The so-called grid method is to use transparent grid paper (generally 30cm × 30cm) to cover the surface of the core, and divide the length of the line segments passing through the fracture holes in the horizontal and vertical directions by the total strip length (generally in the vertical and horizontal directions). Read the value at intervals of 1cm) to represent the percentage of cracks and holes. Such as figure 1As shown, the solid line segment represents the line segment that passes through the fracture hole, and the dot...

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Abstract

The invention provides a quantitative identification method of fractures and caverns based on core analysis and electrical imaging logging. The quantitative identification method comprises the following steps: calculating parameters of the original hole, caverns and fractures in the coring section according to the core and electric imaging logging data; acquiring marks to identify fractures and caverns by imaging logging through core calibration to obtain fracture and cavern parameters and empirical correction value DeltaX; correcting the parameters of fractures and caverns of the non-coring section of the single well with the empirical correction value, using the average value of the empirical correction value of the neighboring well as the empirical correction value for correcting for the non-coring single well; acquiring the parameters of fractures and caverns every meter of the target layer of each single well, and the fracture and cavern rate that is the sum of the lattice-method fracture and cavern rate and the rock plug rate and the full-diameter fracture and cavern rate, to establish a data base of the fracture and cavern parameters; comprehensively analyzing the acquired parameters of holes, fractures and caverns. Combined with three-dimensional geological modeling technology and connecting-well profile comparison method, the development and distribution law of the holes, caverns and fractures are accurately quantitatively identified and assessed.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, more specifically, the invention relates to a quantitative characterization method of fractures and caves based on core analysis and electrical imaging logging. Background technique [0002] As an important type of reservoir rock, carbonate rock has complex and changeable diagenesis and evolution processes with strong heterogeneity, and the influencing factors and grades of reservoir space development vary greatly. It is difficult to study the formation, distribution and enrichment laws of reservoirs. Currently, technologies for characterization of carbonate reservoir space mainly include core, thin-section observation, conventional logging physical property interpretation, imaging logging, seismic attribute extraction, AVO, fractal analysis, small rock plunger and other technologies. Fracture-vuggy is an important storage space of carbonate reservoirs, and its development de...

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Application Information

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IPC IPC(8): G01N33/24G01V3/26G01V3/38
CPCG01N33/24G01V3/26G01V3/38
Inventor 王振宇张云峰屈海洲杨海军张丽娟
Owner SOUTHWEST PETROLEUM UNIV
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