Method for predicting fracture strength of orthotropic medium
An orthotropic and medium technology, applied in the field of oil and gas geophysics, can solve the problems of reduced rationality of vertical fracture prediction and inability to identify the nature of horizontal fractures, etc.
Active Publication Date: 2018-03-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Although the ellipse fitting method for HTI media has been well applied in the industry, this method cannot identify the properties of horizontal fractures, and when this method is applied to orthotropic media, it has no effect on vertical fractures. The rationality of the prediction will also be reduced, so it is necessary to study the fracture prediction method for orthotropic media
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[0026] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0027] Based on the characteristics of fractured shale reservoirs, an orthotropic medium with a group of vertical fractures developed on a group of horizontal fractures can be abstracted. The current research on fracture prediction in anisotropic media is mainly aimed at a group of HTI media with directional fractures. Through the analysis of its AVAZ anisotropic gradient attributes, the development intensity of high-angle or vertical fractu...
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The invention provides a method for predicting the fracture strength of an orthotropic medium. On the basis of a reflection coefficient approximation formula of an orthotropic medium, an influence trend of a reflection coefficient by an azimuth angle is analyzed on the condition of the same incident angle and the fracture strength of the orthotropic medium is predicted. A reflection coefficient expression of the orthotropic medium is concluded into a binomial expression of a quadratic variation of the sinusoidal function with orientation, wherein a constant term is used for representing the growth strength of the fracture, that is, the comprehensive response of a vertical fracture and a horizontal fracture. The one-item coefficient can be used for distinguishing a main control factor of avertical facture or a horizontal fracture in a high-fracture-strength region. The numerical analysis and practical application have proven the feasibility and rationality of the method.
Description
technical field [0001] The invention belongs to the technical field of oil and gas geophysics, and more specifically relates to a method for predicting fracture strength in an orthotropic medium. Background technique [0002] In low-porosity and low-permeability organic-rich shale, when there are enough natural fractures or micro-cracks and nano-scale pores and fractures in the rock, and a large number of fracture systems can be produced after fracturing, the shale is completely It can become an effective oil and gas reservoir or reservoir. The degree of natural fracture system development directly affects the exploitation benefits of shale oil and gas reservoirs, determines the quality and production of shale gas reservoirs, and contributes to the increase in the volume of free natural gas and the desorption of adsorbed natural gas in shale layers. Therefore, in the exploration and development of shale oil and gas reservoirs, the study of shale fractures is very important....
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Login to View More IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 刘宇巍刘喜武霍志周刘志远张金强
Owner CHINA PETROLEUM & CHEM CORP