Discrete fracture modeling method based on multiscale factor restraint

Abstract

The invention provides a discrete fracture modeling method based on multiscale factor restraint. The discrete fracture modeling method based on multiscale factor restraint comprises the following steps that the fracture parameter of a single well is recognized and described in details; a fault-wrinkle-fracture symbiosis evolution system is established based on the counted fracture parameters, and a key fracture making period is determined; the fracture parameter based on detailed tectonic stress field simulation is calculated in a quantitative mode; main controlling factors for fracture development are optimally selected; the weights of the main controlling factors of the fracture are optimally selected according to the entropy weight method; a multiscale fracture DFN model restrained by multiple factors is established; a double-hole and double-permeability geologic model is established. According to the discrete fracture modeling method based on multiscale factor restraint, the mutual control and influence between multiscale fractures are analyzed based on detailed description, obtained through CT scanning, of one single well, the multiple geological factors, such as the structure and deposition, controlling fracture development are analyzed, the main controlling factors for fracture development are optimally selected according to the entropy weight method, a large-scale discrete fracture model, a medium-scale discrete fracture model and a small-scale discrete fracture model are established, an idea and method for establishing a detailed fracture geologic model are formed, and an important basis is provided for efficient development of a fractured oil reservoir and scheme optimization.

Description

technical field

[0001] The invention relates to the field of fracture modeling, in particular to a discrete fracture modeling method based on multi-scale factor constraints. Background technique

[0002] Reservoir fractures are an important research content in the production and development of oil and gas fields, and a lot of research has been done on the identification and modeling of reservoir fractures. Traditional geological analysis and estimation methods describe outcrops, cores, and thin sections, but are limited to rock surface phenomena due to human factors. Although the geophysical research methods based on logging identification and seismic identification are rich in information, the accuracy of identification is greatly affected by the data. Fold curvature method and fractal method are only used for brittle fold formations. At present, the relatively widely used fracture mechanics simulation method is to simulate the stress field by establishing a mechanical mo...

Examples

Embodiment

[0068] The present invention intends to take the KX gas field in the Kuqa Depression as an example to develop the modeling and design of fine reservoir fractures. Firstly, the detailed fracture space parameters are obtained by means of field outcrop, drilling core, CT scanning and microscope observation; secondly, Using the improved Sobel operator-based directional boundary filtering technology to obtain low-order sequence faults and lateral accommodation faults, use the deterministic method to establish large and medium-scale fracture models, and analyze faults, folds, lithology, thickness, reservoir physical properties, Controlling effect of interlayer frequency on fracture development, establish fault and fold coupling control fracture development model, predict fracture distribution range based on rock mechanics method and fold curvature method, use entropy weight method to optimize main controlling factors and obtain corresponding weights, and establish fracture development...

technical field

[0001] The invention relates to the field of fracture modeling, in particular to a discrete fracture modeling method based on multi-scale factor constraints. Background technique

[0002] Reservoir fractures are an important research content in the production and development of oil and gas fields, and a lot of research has been done on the identification and modeling of reservoir fractures. Traditional geological analysis and estimation methods describe outcrops, cores, and thin sections, but are limited to rock surface phenomena due to human factors. Although the geophysical research methods based on logging identification and seismic identification are rich in information, the accuracy of identification is greatly affected by the data. Fold curvature method and fractal method are only used for brittle fold formations. At present, the relatively widely used fracture mechanics simulation method is to simulate the stress field by establishing a mechanical mo...

Examples

Embodiment

[0068] The present invention intends to take the KX gas field in the Kuqa Depression as an example to develop the modeling and design of fine reservoir fractures. Firstly, the detailed fracture space parameters are obtained by means of field outcrop, drilling core, CT scanning and microscope observation; secondly, Using the improved Sobel operator-based directional boundary filtering technology to obtain low-order sequence faults and lateral accommodation faults, use the deterministic method to establish large and medium-scale fracture models, and analyze faults, folds, lithology, thickness, reservoir physical properties, Controlling effect of interlayer frequency on fracture development, establish fault and fold coupling control fracture development model, predict fracture distribution range based on rock mechanics method and fold curvature method, use entropy weight method to optimize main controlling factors and obtain corresponding weights, and establish fracture development...

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