Shale compressibility evaluation method

A technology for shale and natural fractures, applied in the field of calculating shale compressibility index, can solve problems such as not considering the influence of natural fractures, and achieve the effect of improving the effect

Active Publication Date: 2019-04-16
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology

Experts such as Jiang Tingxue believe that the brittleness index is the basis for evaluating the compressibility of shale, but this does not take into account the influence of natural fractures

Method used

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Embodiment Construction

[0022] Below the implementation method of the present invention is described in further detail, specifically as follows:

[0023] Taking a well in Fuling as an example, the buried depth of the reservoir is 3908-3945m, and the shale compressibility index is calculated by the method of the present invention.

[0024] 1. According to step 1, prepare the maximum horizontal principal stress, the minimum horizontal principal stress, the angle between the hydraulic fracture surface and the natural fracture surface of the fracturing interval, and the stimulation volume measured by microseismic.

[0025] 2. Use the maximum horizontal principal stress, the minimum horizontal principal stress and the angle between the hydraulic fracture surface and the natural fracture surface to calculate the influencing factors for the opening of each natural fracture, as shown in Table 1.

[0026] 3. Use steps 3 and 4 to get the number of cracks, and the number of cracks is shown in Attached Table 2. ...

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Abstract

The invention discloses a method for rapidly calculating the compressibility of the rock based on logging data, rock mechanics triaxial test, X-ray diffraction full-rock quantitative analysis and transformation volume measured by microseism, so that the rapid calculation of the compressibility of the shale reservoir under the stratum condition can be realized, and the high-efficiency development of the shale gas reservoir can be promoted. The method is mainly based on the influence of mineral brittleness and natural cracks, the better the brittleness of the minerals is, the larger the influence factor of the natural crack is, the better the compressibility of the rock is, the compressibility of the mineral is optimized by utilizing the number of cracks of the rock mechanics triaxial test,then the natural crack characteristics of the reservoir are combined, the compressibility characteristics of the rock can be well described, the volume is improved by combining the microseism, the weight coefficients of the mineral compressibility and the natural crack influence factors are analyzed and calculated through multivariate linear regression analysis, so that a novel method for calculating the compressibility evaluation of the rock is established. According to the method for rapidly calculating the compressibility of the rock, the reasonability of rock compressibility evaluation isimproved, and efficient development of shale gas reservoirs is promoted.

Description

technical field [0001] The invention relates to the field of unconventional oil and gas exploration and development, in particular to a method for calculating shale compressibility index. Background technique [0002] my country's shale gas reserves are abundant and have good development potential, but the development is difficult. Different from the development of conventional oil and gas reservoirs, fracture network fracturing is commonly used in the development of shale gas reservoirs. In fracture network fracturing, rock compressibility is an important parameter to judge the ability of reservoir fracturing to form fracture network. Experts such as Jiang Tingxue believe that the brittleness index is the basis for evaluating the compressibility of shale, but this does not take into account the influence of natural fractures. Therefore, shale gas fracturing urgently needs a shale fracability calculation method that considers the influence of natural fractures and is conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00G01N23/20
CPCG01N3/00G01N23/20G01N2203/0062G01N2203/0256G01N2203/0641G01N2223/056G01N2223/1016G01N2223/616
Inventor 廖如刚郭建春高东伟赵志红李婷唐鹏程张驰李鹏张晗苏慕博文崔静
Owner CHINA PETROLEUM & CHEM CORP
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