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Method used for determining shale formation brittleness index

A brittleness index and formation technology, applied in the field of shale oil and gas exploration and development, can solve the problem of inaccurate brittleness index and achieve the effect of accurately determining the brittleness index

Active Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0013] However, there is a contradiction between the brittleness index and the brittleness of the actual formation, and the Young's modulus and Poisson's ratio have different effects on the brittleness of shale formations, so the brittleness index determined by this method is not accurate enough

Method used

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  • Method used for determining shale formation brittleness index
  • Method used for determining shale formation brittleness index
  • Method used for determining shale formation brittleness index

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Embodiment 1

[0043] figure 1 is a flowchart of the steps of the method for determining the brittleness index of the shale formation according to this embodiment. The following combination figure 1 The method of this embodiment will be described in detail.

[0044] In step S101, the comprehensive fracture toughness is determined according to the mineral composition of the shale formation in the geological region. Because different minerals have different fracture toughness, different minerals in shale formations play different roles in the fracturing process.

[0045] Firstly, the mineral components and their mass contents in the shale formation in the geological area are determined, and then the fracture toughness of various mineral components is used as a weighting coefficient to weight and sum the mass contents of the mineral components to obtain the comprehensive fracture toughness. For example, the mineral composition and its mass content in the shale formation can be determined by ...

Embodiment 2

[0064] figure 2 It is a schematic diagram of the shale formation minerals and brittleness index of well X1 in a certain area according to this embodiment. The first channel is the formation depth, the second channel is the mineral mass content combination of shale formations, the third channel is the total organic carbon content in shale formations, the fourth channel is the total gas content in shale formations, the fifth channel and the The sixth track is the Poisson's ratio and Young's modulus in the horizontal and vertical directions in the shale formation, the seventh track is the horizontal and vertical brittleness index calculated according to the method of Bill Grieser and Jim Bray, and the eighth track is the method in Example 1 Calculated brittleness index.

[0065] figure 2 The second track in the middle is the combination of mineral mass content calculated based on element logging data, which respectively express the following mass content: pyrite WPYR, illite ...

Embodiment 3

[0071] image 3 It is a schematic diagram of the shale formation minerals and brittleness index of Well X2 in a certain area according to this embodiment. The significance of each curve in the figure and figure 2 same.

[0072] image 3 It is the brittleness index curve of 2215-2160 meters in Well X2, and the anisotropy of rock mechanical parameters in this well section is larger than that in Well X1. The brittleness index calculated by rock mechanics parameters is about 40 in the 2346-2354 m section, indicating that the brittleness of this section is low. Judging from the mineral content of the shale formation, the formation minerals in the 2340-2370 m well section are almost the same, so the change of the brittleness index should not appear like this image 3 The drastic change shown in the seventh track. This shows that the brittleness index calculated by rock mechanics parameters in the prior art is not accurate. However, the brittleness index calculated by fracture...

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Abstract

The invention discloses a method used for determining shale formation brittleness index. The method comprises following steps: comprehensive fracture toughness is determined based on forming situations of shale formation in geological zones; the maximum fracture toughness and the minimum fracture toughness of each single kind mineral shale formation are determined; and the shale formation brittleness index is obtained based on the comprehensive fracture toughness, and the maximum fracture toughness and the minimum fracture toughness of each single kind mineral shale formation. According to the method, influences of minerals are taken into consideration, and initiation toughness of each mineral is taken into consideration, so that the obtained shale formation brittleness index is more accurate.

Description

technical field [0001] The invention relates to the technical field of shale oil and gas exploration and development, in particular to a method for determining the brittleness index of shale formations. Background technique [0002] Shale formations usually have very low permeability and need to be fractured through large-scale fracturing to increase the seepage capacity of shale formations. The fracturing capability of a shale formation is determined by the brittleness index of the shale formation. The following methods are used in the prior art to determine the brittleness index of shale formations. [0003] Evans (1990) defined the degree of deformation less than 1% as brittle, greater than 5% as ductile, and others as brittle-ductile transition. Ingram and Urai (1999) expressed the brittleness index by the ratio of the uniaxial compressive strength of over-bonded and normal cemented, but it is difficult to determine the cemented degree of the rock in reality. Jarvie (...

Claims

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Application Information

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IPC IPC(8): G01N33/24
Inventor 廖东良路保平吴海燕王志战李新张新华
Owner CHINA PETROLEUM & CHEM CORP
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