Method for interpreting the deformation modulus and the brittleness index of rock by using acoustic logging information

A deformation modulus and logging data technology, which is applied in the seismology of logging records, etc., can solve the problem that the brittleness index is difficult to characterize more comprehensively, and achieve the effect of accurate results.

Active Publication Date: 2017-06-27
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the brittleness index of the content of mineral components is

Method used

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  • Method for interpreting the deformation modulus and the brittleness index of rock by using acoustic logging information
  • Method for interpreting the deformation modulus and the brittleness index of rock by using acoustic logging information
  • Method for interpreting the deformation modulus and the brittleness index of rock by using acoustic logging information

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Embodiment

[0033] Experimental object: the fifth member of Xujiahe Formation in Xinchang area, Sichuan Basin. Xu 5 Member belongs to delta plain-shallow lake sedimentary environment, the lithology is mainly black, gray-black mud shale and gray, gray-brown siltstone, fine sandstone interbedded with different thickness, and the sand-to-ground ratio is mainly distributed in 30%-70% between. Considering the difference in lithology of shale reservoirs in the evaluation area, 26 samples of shale, silty shale, siltstone, fine sandstone, and unequal-grained sandstone were selected in this embodiment.

[0034] Experimental test: Density measurement, triaxial compression test, and acoustic longitudinal wave velocity test were carried out on the above-mentioned 26 samples. The test results are shown in Table 1. Table 2 shows the mechanical parameters obtained from the indoor test under the indoor simulated formation conditions (that is, when the confining pressure is 32MPa) and the mechanical para...

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Abstract

The invention discloses a method for interpreting the deformation modulus and the brittleness index of rock by using acoustic logging information and relates to oil and gas reservoir logging evaluation. According to the method for interpreting the deformation modulus by using the acoustic logging information, the interpretation model of the deformation modulus is described as Dm = ae<b*f(AC)>, wherein Dm is the deformation modulus, f(AC) = Vp is the acoustic longitudinal wave velocity, and a and b are both constants. The computational formula of the f(AC) is: f(AC) = pAC<q>, wherein p and q are both constants and AC is the logging interval transit time. The method quantitatively interprets the deformation modulus of the rock by establishing a function relation between the logging interval transit time and the deformation modulus, and is more accurate in result. The method for interpreting the brittleness index by using acoustic logging information comprises calculating the brittleness index of the rock by using the static Young modulus of the rock and according to the method for interpreting the deformation modulus of the rock by using the acoustic logging information. The method for interpreting the deformation modulus and the brittleness index of rock by using acoustic logging information can well reflect the change rule of the brittleness characteristics of the reservoir rock in a logging profile, and provides reference data for reservoir rock mechanics evaluation and hydraulic fracturing construction.

Description

technical field [0001] The invention relates to the field of well logging evaluation of oil and gas reservoirs, and in particular to a method for interpreting rock deformation modulus and brittleness index by using acoustic logging data. Background technique [0002] In the evaluation of the brittleness characteristics of shale reservoirs, the plastic deformation characteristics of rocks need to be considered, and the elastic strain and plastic strain are important parameters for evaluating the brittleness of shale. These parameters can be obtained by rock mechanics experiments in the laboratory, but they cannot be used in field evaluation. To realize field application, it is necessary to establish the strain value of mud shale using well logging data. [0003] In the evaluation of well logging interpretation, the evaluation method of rock brittleness is established mainly through two aspects: [0004] (1) Evaluation method of brittle logging based on elastic characteristic...

Claims

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Application Information

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IPC IPC(8): G01V1/40
Inventor 周文徐浩周秋媚陈文玲曹茜
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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