Method for evaluating brittleness of shale reservoir

A technology for shale reservoirs and evaluation methods, which is applied in earthwork drilling, wellbore/well components, etc., can solve problems such as low evaluation accuracy and failure to meet the prediction of brittleness plane distribution, so as to improve the accuracy of brittleness evaluation and eliminate the impact , the effect of broad application prospects

Active Publication Date: 2015-04-29
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] In order to solve the problem that the existing shale reservoir brittleness evaluation technology cannot satisfy the prediction of the brittleness plane distribution in the whole resea

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  • Method for evaluating brittleness of shale reservoir
  • Method for evaluating brittleness of shale reservoir
  • Method for evaluating brittleness of shale reservoir

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Embodiment Construction

[0029] In the prior art in this field, since the extraction of density information in the inversion results requires large-angle information (that is, long offsets), the long-length offset arrangement cannot be afforded in actual production, and It is also difficult to guarantee the quality of large-angle seismic data. Therefore, the determination of density is the key to the evaluation method of shale reservoir brittleness, and it is also a long-standing technical problem in this field. The technology proposed in this specific implementation mode aims at the impact of the existing shale reservoir brittleness evaluation method on the evaluation results due to the low accuracy of the density term, and proposes an evaluation method for shale reservoir brittleness, through Young's model The product of quantity and density evaluates brittleness, because the product of Young’s modulus and density can be directly characterized by the combination of P- and S-wave impedance, and the r...

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Abstract

The invention provides a method for evaluating brittleness of a shale reservoir and belongs to the technical field of nonconventional oil and gas reservoir evaluation. The method comprises the following steps: acquiring an elastic parameter and a brittleness mineral parameter of the shale reservoir to be evaluated, wherein the elastic parameter comprises Young modulus*density; carrying out cross analysis on the Young modulus*density and other elastic parameters and/or the brittleness mineral parameter and according to a cross analysis result, determining a value domain of the Young modulus*density; according to p-wave and s-wave impedances obtained by prestack inversion, establishing a Young modulus*density attribute volume; evaluating the brittleness of the shale reservoir to be evaluated by the Young modulus*density attribute volume in the value domain. According to the invention, accuracy of evaluating the brittleness of the shale reservoir is improved, prediction on planar distribution of the brittleness in the integral research region is implemented and the method has wide application prospect in the field of exploration and development of shale gas.

Description

technical field [0001] The invention relates to a shale reservoir brittleness evaluation method, which belongs to the technical field of unconventional oil and gas reservoir evaluation. Background technique [0002] Shale gas is an unconventional natural gas resource. Because shale is an ultra-low porosity and low permeability reservoir, its accumulation mode, natural gas accumulation method and development method are very different from conventional oil and gas reservoirs. Therefore, shale gas Reservoir fracturing must be carried out in the mining. Reservoir fracturing is a key measure to improve the permeability of shale gas reservoirs and ensure the smooth exploitation of shale gas. Previous studies have shown that in areas with high reservoir brittleness, increasing the volume of reservoir stimulation can increase the recovery rate of shale gas because rocks are more likely to be pushed apart and fracture network communication is easier to form. Therefore, searching fo...

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 刘伟王熙明张宇生余刚万小平金其虎程飞刘本晶张固澜容娇君
Owner BC P INC CHINA NAT PETROLEUM CORP
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