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Multi-stage and multi-scale fracture permeability parameter quantitative forecasting method

A prediction method and multi-scale technology, applied in the field of oil and gas exploration and development, can solve the problems of difficult quantitative prediction of multi-scale fracture porosity and permeability parameters, and achieve the effects of strong operability, high practical value and low prediction cost.

Inactive Publication Date: 2018-05-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] The present invention aims to solve the above problems, and provides a quantitative prediction method for multi-stage and multi-scale fracture porosity and permeability parameters, which solves the problem that the multi-stage and multi-scale fracture porosity and permeability parameters are difficult to quantitatively predict

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  • Multi-stage and multi-scale fracture permeability parameter quantitative forecasting method

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specific Embodiment approach

[0051] The specific technical scheme of the present invention is illustrated by taking the quantitative prediction of multi-phase and multi-scale fracture porosity and permeability parameters of the second member of the Funing Formation (abbreviated as the second member of the Funing Formation) in Jinhu Sag, Subei Basin as an example:

[0052] Since the deposition of the Fu 2 Member, the Jinhu Sag has mainly experienced two stages of tectonic movements, Wubao and Sanduo. The main fracturing period of the Fu 2 Member in the study area was the Wubao period. During this period, the faults were strongly active, mainly showing near-north-south extension, forming a complex fault system inside the sag. Combined with regional geological data, the steps of quantitative prediction of multi-period and multi-scale fracture porosity and permeability parameters in the second member of Jinhu sag are as follows:

[0053] The first prediction of surface density of fractures at different scales...

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Abstract

The invention relates to the field of oil-gas field exploration and development, in particular to a multi-stage and multi-scale fracture permeability parameter quantitative forecasting method. According to the multi-stage and multi-scale fracture permeability parameter quantitative forecasting method, a fault-fracture self-similarity theory is used for forecasting a surface density calculation method for different scales of fractures; initial opening degrees of the different scales of fractures are determined by adopting a random polarization state restriction method according to fracture parameters of observed cores and laminas and an extending rule of faults; the opening capacity of the fractures in the current stress field is analyzed through current geostress field value simulation; acalculation model applicable to multi-scale and multi-stage fracture parameters is provided in combination with the opening degrees, the surface densities and the development scale of the fractures, so as to quantitatively forecast the fracture porosity, the size of the maximum permeability and the directions of the fractures. The multi-stage and multi-scale fracture permeability parameter quantitative forecasting method is deduced from a strict mathematical algorithm; after corresponding geological information is digitalized, a computer programming language can be used for developing a corresponding calculation program, so as to realize quantitative forecasting of multi-stage and multi-scale fracture permeability parameters.

Description

technical field [0001] The invention relates to the field of exploration and development of oil and gas fields, in particular to a method for quantitatively predicting multi-period and multi-scale fracture porosity and permeability parameters. Background technique [0002] In oil and gas producing areas in eastern my country, structural fractures in reservoirs are closely related to the development degree of faults, and faults and structural fractures are consistent in origin; combined with the spatial combination of high-order faults and low-order faults, it provides a basis for the prediction of fault-related fractures. A way of thinking. In the exploration and development of fractured oil and gas reservoirs, the difficulty lies in the evaluation of the distribution range and development degree of fractures in the reservoir rock mass and the quantitative prediction of porosity and permeability parameters. Fractures play a dual role in oil and gas development. On the one ha...

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08G01N15/088
Inventor 刘敬寿
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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