A method for calculating sandstone permeability based on microscopic image processing
A technology of microscopic images and calculation methods, which is applied in the fields of permeability/surface area analysis, suspension and porous material analysis, and measurement devices, which can solve problems such as difficult rock permeability evaluation, and achieve good exploration and development, and good consistency Effect
Active Publication Date: 2022-07-01
SOUTHWEST PETROLEUM UNIV
View PDF22 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, there are two main types of commonly used methods for evaluating rock permeability: the first is direct laboratory measurement, that is, using a permeability meter to measure the permeability of a plunger core. This method has the advantage of high accuracy, but requires a large number of columns. plug core for measurement
The second type is the calculation and acquisition of well logging. According to the different logging methods used, it can be divided into the permeability calculated by conventional logging and the permeability calculated by nuclear magnetic resonance logging. The advantage of this method is that it can continuously calculate the reservoir Permeability, but also need a large number of core gas porosity and permeability data for porosity-permeability relationship fitting, and also need to obtain logging data
[0003] When it is difficult to obtain the plunger core (the core is fragile, etc.), and the gas permeability data of the core is lacking, the rock permeability evaluation will be more difficult
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0094]The specific embodiment of the present invention is described by taking the 6 sandstone sample cast thin slices of the P gas field as an example.
[0095] (1) Shooting and screening of sandstone microscopic images;
[0096] Microscopic images with a magnification of 50 times and a viewing area size of 3 mm × 3 mm were taken for the 6 sandstone samples of the P gas field. Figure 7 (a), (b), (c), (d), (e), (f)).
[0097] (2) Binarized segmentation of sandstone microscopic images;
[0098] After converting the microscopic images of colored cast thin sections of six sandstone samples into grayscale images, appropriate thresholds were selected to segment the microscopic images of sandstone into frameworks and pores. Figure 7 (g), (h), (i), (j), (k), (l) are the binarized pore network images, which are used for the determination of the surface surface in step (3); Figure 7 (m), (n), (o), (p), (q), (r) are the pore throat-enhanced binarized pore network images for step (4...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for calculating the permeability of sandstone based on microscopic image processing. After the pore network image; the surface porosity of the sandstone microscopic image is determined according to the binarized pore network image; the particle diameter is determined according to the pore network image after pore throat enhancement; the pore curvature is determined according to the pore network image after pore throat enhancement; The permeability of sandstone is obtained by calculating the surface porosity, particle diameter and pore tortuosity. Aiming at the situation that it is difficult to obtain a large number of plunger cores, the invention only extracts the microscopic parameters of sandstone and calculates the permeability of sandstone through image processing through easily obtained rock microphotographs taken by small fragmented cores, so as to make up for the lack of permeability data. , to better guide the exploration and development of sandstone oil and gas reservoirs.
Description
technical field [0001] The invention relates to a sandstone permeability calculation method based on microscopic image processing, and belongs to the technical field of oil and natural gas exploration and development. Background technique [0002] Permeability refers to the ability of a rock to allow fluid to pass through under a certain pressure difference. It is a parameter that characterizes the ability of the rock itself to conduct liquids. This parameter is very important for the evaluation of oil and gas reservoirs. At present, there are two main types of commonly used methods for rock permeability evaluation: the first type is direct laboratory measurement, that is, the permeability of plunger cores is measured by a permeability meter. The advantage of this method is high accuracy, but requires a large number of columns. The plug core is measured. The second type is logging calculation and acquisition. According to the different logging methods used, it can be divide...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 吴丰代槿史彪梁芸习研平石祥超何江
Owner SOUTHWEST PETROLEUM UNIV