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Comprehensive evaluation method for effectiveness of compact low-permeability reservoir fractures

A low-permeability reservoir, comprehensive evaluation technology, applied in the field of quantitative evaluation and prediction of the effectiveness of tight and low-permeability reservoirs, can solve the problems of oil and gas exploration and development in tight and low-permeability reservoirs.

Active Publication Date: 2016-11-16
CHINA UNIV OF PETROLEUM (BEIJING)
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AI Technical Summary

Problems solved by technology

At present, the evaluation of fracture effectiveness is qualitative, and the evaluation results are far from meeting the requirements of oil and gas exploration and development in tight and low-permeability reservoirs.

Method used

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  • Comprehensive evaluation method for effectiveness of compact low-permeability reservoir fractures
  • Comprehensive evaluation method for effectiveness of compact low-permeability reservoir fractures
  • Comprehensive evaluation method for effectiveness of compact low-permeability reservoir fractures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment quantitatively evaluates and predicts the effectiveness of fractures in tight natural gas reservoirs in a certain area of ​​my country; specifically, the following steps are included:

[0033] (1) Determine the well to be logged, and calculate the single factor index corresponding to each fracture effectiveness factor in a certain direction in the well to be logged;

[0034] The fracture effectiveness factors include fracture formation time, fracture trend, fracture dip angle, fracture development degree, in-situ stress direction, in-situ stress magnitude, formation pressure, bottom depth, late structural uplift and denudation, late fault activity and dissolution, A total of 11 items, namely n=11;

[0035] Among them, the single factor index F corresponding to the i-th effectiveness factor i The calculation method of is shown in formula I:

[0036] F i = Σ j ...

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Abstract

The invention relates to a comprehensive evaluation method for effectiveness of compact low-permeability reservoir fractures. The method comprises the steps that single-factor indexes corresponding to effectiveness factors of the fractures are calculated, and effective indexes of the factures are calculated on this basis. The quantitative evaluation method for the effectiveness of the compact low-permeability reservoir fractures on the basis of a fracture effectiveness index method is provided according to main influence factors of the effectiveness of the natural fractures; by means of the method, the effectiveness of the natural fractures in different directions in a compact low-permeability reservoir and the total fracture effectiveness are quantitatively evaluated, the relative yield of natural gas is further predicted, the method can be widely applied to quantitative evaluation and prediction of the fracture effectiveness of compact low-permeability oil and gas reservoirs and other unconventional oil and gas reservoirs in China, and a technical support and a geological basis are provided for exploration and development of the compact low-permeability oil and gas reservoirs and other unconventional oil and gas reservoirs in China.

Description

technical field [0001] The invention relates to the field of oil and gas geology, in particular to a method for quantitatively evaluating and predicting the effectiveness of fractures in tight and low-permeability reservoirs. Background technique [0002] Natural fractures are commonly developed in tight low-permeability reservoirs. After natural fractures are formed, some fractures are often filled with minerals such as quartz and calcite to become invalid fractures, and the effectiveness of cracks that are not filled with minerals also varies greatly. Therefore, the evaluation and prediction of the effectiveness of natural fractures is the key to the evaluation of tight and low-permeability reservoirs, and is crucial to the oil and gas exploration and development of tight and low-permeability reservoirs. Effective fractures are the effective storage spaces and main seepage channels of tight low-permeability reservoirs, which determine the quality, potential production cap...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 曾联波祖克威
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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