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A multi-scale and multi-component digital core construction method for unconventional reservoirs

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: 2021-08-03
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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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  • A multi-scale and multi-component digital core construction method for unconventional reservoirs
  • A multi-scale and multi-component digital core construction method for unconventional reservoirs
  • A multi-scale and multi-component digital core construction method for unconventional reservoirs

Examples

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Embodiment 1

[0058] Taking the construction of multi-scale and multi-component shale digital cores with the fusion of different pore scale information at a depth of 4307m-4308m in Z mud shale reservoir of an example well in an oilfield in China as an example, figure 1 It is a flow chart of a method for constructing a 3D digital core of a multi-scale and multi-component shale reservoir, a method for constructing a 3-D digital core of a multi-scale and multi-component shale reservoir, which specifically includes the following steps:

[0059] Step 1: Construct a multi-scale 3D digital core that integrates information of different pore scales, including the following steps:

[0060] Step 1.1: Drill plunger cores of different sizes in the same part of the same core in the shale reservoir well Z of an oilfield, and scan the corresponding drilled cores with resolutions of 4 μm, 1 μm and 500 nm before drilling. Plunger cores to acquire core images at different resolutions.

[0061] Step 1.2: Aviz...

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Abstract

A multi-scale and multi-component digital core construction method for unconventional reservoirs, comprising the following steps: Step 1: Construct a multi-scale three-dimensional digital core with different scale pore information fusion; Step 2: Based on the two-dimensional image of the core, construct multiple Fractional digital core; Step 3: Nest multi-scale cores and multi-component cores that integrate different pore-scale information, and construct multi-scale and multi-component unconventional reservoir 3D digital cores that contain different scale pore information. The invention realizes the fusion of pore information of different scales and the characterization of rock mineral components at the same time. The constructed results are helpful to study the elastic properties of tight sandstone and shale reservoirs, and to explore the impact of different mineral components, fractures and bedding on rock elasticity. Therefore, the exploratory research on the cause of rock brittleness provides basic theoretical support for the evaluation of tight sandstone and shale brittleness logging and even the study of fracturing stimulation.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a multi-scale and multi-component digital core construction method for unconventional reservoirs. Background technique [0002] Unconventional reservoirs represented by tight sandstone and shale have become the focus and focus of oil and gas exploration at home and abroad. The characteristics of this type of reservoir are as follows: First, the pore structure is complex, the pore size distribution range is wide, and the pore size ranges from nanometer to , microns, dozens of microns to several millimeters, the scale spans 3-6 orders of magnitude; secondly, in unconventional reservoirs, especially in the framework of shale, there are many mineral components, 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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