Calculation method for rock brittleness index of compact reservoir

A technology for rock brittle and tight reservoirs, which can be used in instrumentation, geophysical measurement, soil material testing, etc., can solve problems such as difficult on-site application, and achieve the effect of improving the effect

Active Publication Date: 2017-03-29
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The rock brittleness in the field of rock mechanics is mainly calculated based on the stress-strain curve and mechanical characteristics of

Method used

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  • Calculation method for rock brittleness index of compact reservoir
  • Calculation method for rock brittleness index of compact reservoir
  • Calculation method for rock brittleness index of compact reservoir

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Embodiment Construction

[0038] Below the implementation method of the present invention is described in further detail, specifically as follows:

[0039] Taking a tight oil reservoir in the Kong 2 Member of Dagang Oilfield as an example, the buried depth of the reservoir is 4050-4065m, and the average formation pressure of this well section is 45MPa. Taking the buried depth of 4050m as an example, the method of the present invention is used to calculate the brittleness index.

[0040] 1. According to step 1, prepare the shear time difference, longitudinal wave time difference, density, porosity and natural gamma ray logging curve of the fracturing section, and the logging data are as attached figure 2 shown;

[0041] 2. Calculate the Young’s modulus, Poisson’s ratio, internal friction angle, and shale content of the rock by using the relevant logging data, and calculate the Young’s modulus, Poisson’s ratio, internal friction angle, and shale content at the buried depth of 4050m through the formulas...

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Abstract

The invention provides a method for calculating the rock brittleness rapidly based on logging data, and aims at realizing rapid calculation for the rock brittleness of a compact reservoir under a stratum condition and facilitating high-efficiency exploitation of compact hydrocarbon reservoir. From the aspects of rock rupture form and rupture breaking energy, the method mainly uses the principle that the more complex the rock rupture form is, the lower the rupture breaking energy is and the greater the rock brittleness index is. A young modulus and a dilatancy angle are used to reflect the deformation resistance and the deformation speed of the rocks respectively, the rock brittleness feature can be described effectively, and the young modulus and the dilatancy angle can also reflect characteristics of a rock stress-strain curve in different stages. A grey relation theory is used to calculate weight coefficients of the young modulus and the dilatancy angle, and a new method to calculate the rock brittleness index is established. The method predicts the brittleness index rapidly on the basis of the logging data, evaluation of the rock brittleness is more reasonable, and high-efficiency exploitation of the compact hydrocarbon reservoir is facilitated.

Description

[0001] Technical field: [0002] The invention relates to the field of unconventional oil and gas exploration and development, in particular to a method for calculating the brittleness index of tight reservoir rocks based on logging data. [0003] Background technique: [0004] my country's tight oil and gas reserves are abundant and have good development potential, but the development is difficult. Inspired by the effective development of shale gas reservoirs, fracture network fracturing has been practiced in tight oil and gas reservoirs. In fracture network fracturing, rock brittleness is an important parameter to judge the ability of reservoir fracturing to form fracture network. At present, the mineral brittleness index and dynamic rock mechanics parameters most widely used in oil and gas development in the petroleum industry to calculate rock brittleness are summaries of the shale gas fracturing experience in the United States. The rock brittleness in the field of rock m...

Claims

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Application Information

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IPC IPC(8): G01V11/00G01N33/24
CPCG01N33/24G01V11/00
Inventor 赵志红郭建春张胜传卢聪王娟黄超张晗
Owner SOUTHWEST PETROLEUM UNIV
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