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Unconventional reservoir multi-scale and multi-component digital rock core construction method

A technology of digital core and construction method, applied in the field of oil and gas exploration, which can solve problems such as zero template state

Active Publication Date: 2021-02-09
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) Using MCMC to build multi-component 3D digital cores based on 2D images of cores, to solve the problem that some templates are in zero state during the construction of 3D cores

Method used

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  • Unconventional reservoir multi-scale and multi-component digital rock core construction method
  • Unconventional reservoir multi-scale and multi-component digital rock core construction method
  • Unconventional reservoir multi-scale and multi-component digital rock core construction method

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Embodiment 1

[0060]Take the example of the construction of multi-scale and multi-component shale digital cores with deep fusion of information of different pore scales in the 4307m-4308m shale reservoirs of example well Z in an oil field in China.figure 1 A flow chart of the method for 3D digital core construction of multi-scale and multi-component shale reservoirs. A method for 3D digital core construction of multi-scale and multi-component shale reservoirs specifically includes the following steps:

[0061]Step 1: Construct a multi-scale 3D digital core that integrates information of different pore scales, including the following steps:

[0062]Step 1.1: Drill plunger cores of different sizes in the same part of the same core in a shale reservoir well Z in an oil field, and scan the corresponding drilled cores with 4μm, 1μm and 500nm resolution before drilling. Plunger core to obtain core images of different resolutions.

[0063]Step 1.2: Avizo software image registration sequentially determines the po...

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Abstract

The invention discloses an unconventional reservoir multi-scale and multi-component digital rock core construction method. The method comprises the following steps: step 1, constructing a multi-scalethree-dimensional digital rock core fused with pore information of different scales; 2, constructing a multi-component digital rock core based on a rock core two-dimensional picture; and 3, nesting the multi-scale rock core fused with different pore scale information with the multi-component rock core, and constructing a multi-scale and multi-component unconventional reservoir three-dimensional digital rock core containing different scale pore information. According to the method, fusion of pore information of different scales is achieved, characterization of rock mineral components is achieved at the same time, the constructed result is beneficial for researching the elastic properties of tight sandstone and shale reservoirs and exploring the influence rules of different mineral components, cracks, stratification and the like on the elastic properties of the rock, and therefore exploratory research is conducted on the rock brittleness cause, and a basic theoretical support is providedfor tight sandstone and shale brittleness logging evaluation and even fracturing transformation research.

Description

Technical field[0001]The invention relates to the field of oil and gas exploration, in particular to a method for constructing multi-scale and multi-component digital cores of unconventional reservoirs.Background technique[0002]Unconventional reservoirs, represented by tight sandstone and shale, are currently the hotspot and focus of oil and gas exploration at home and abroad. The characteristics of this type of reservoir are: First, the pore structure is complex, the pore size distribution range is wide, and the pore size ranges from nanometers. , Micrometers, tens of micrometers to a few millimeters, the scale spans 3-6 orders of magnitude; secondly, there are many mineral components in unconventional reservoirs, especially shale framework, such as quartz, calcite, clay, organic matter, etc., framework minerals The resistivity characteristics challenge the role of resistivity logging in the evaluation of shale reservoirs. The elastic properties of framework minerals affect the bri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/70G06T7/33G06T7/136G06T17/00G06T5/40
CPCG06T5/40G06T17/00G06T7/136G06T7/337G06T7/70
Inventor 王海涛赖富强黄兆辉朱章雄谭先锋刘粤姣张国统钟路路
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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