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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 Pois

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

Examples

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Example Embodiment

[0042] Example one

[0043] figure 1 It is a flowchart of the method for determining the brittleness index of a shale formation according to this embodiment. Combine the following 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 area. Because different minerals have different fracture toughness, different minerals in shale formation have different effects on the fracturing process.

[0045] Firstly, determine the mineral components and their mass content in the shale formation in the geological area, and then use the fracture toughness of various mineral components as a weighting coefficient to sum the mass content of the mineral components to obtain the comprehensive fracture toughness. For example, the whole rock experiment method or the ECS element logging method can be used to determine the mineral composit...

Example Embodiment

[0063] Example two

[0064] figure 2 It is a schematic diagram of mineral and brittleness index of shale formation in Well X1 in a certain area according to this embodiment. The first track is the formation depth, the second track is the mineral quality content combination of the shale formation, the third track is the total organic carbon content in the shale formation, the fourth track is the total gas content in the shale formation, the fifth track and the first track The sixth track is the horizontal and vertical Poisson's ratio and Young's modulus in the shale formation. The seventh track is the horizontal and vertical brittleness index calculated according to the BillGrieser and JimBray method. The eighth track uses 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 elemental logging data, which respectively indicate the following mass content: pyrite WPYR, ...

Example Embodiment

[0070] Example three

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

[0072] image 3 It is the 2215-2160m brittleness index curve of Well X2. The anisotropy of rock mechanics parameters in this section is larger than that of Well X1. The brittleness index calculated by rock mechanics parameters is about 40 in the 2346-2354-meter well section, indicating that this section is relatively low brittle. From the perspective of the mineral content of shale formations, the formation minerals of the 2340-2370 m well section are almost the same, so the brittleness index change should not appear as image 3 The dramatic change shown in the seventh track. This shows that the brittleness index calculated by rock mechanics parameters in the prior art is not accurate. The brittleness index calculated by fracture t...

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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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