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Method for analyzing development degree of inner seam of quartz grain

A technology of development degree and quartz, which is applied in the field of analyzing the development degree of inner fractures of quartz grains, and can solve the problems that it is difficult to know the development degree of inner fractures of quartz grains

Inactive Publication Date: 2020-05-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The inner seam of quartz grain is a kind of micro-crack, because it exists in the grain, it needs to go through a series of treatment first and then observe it with a microscope. When working on site, due to limited conditions, it is difficult for field workers to know Through the degree of development of the inner slit of the quartz grain

Method used

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  • Method for analyzing development degree of inner seam of quartz grain
  • Method for analyzing development degree of inner seam of quartz grain
  • Method for analyzing development degree of inner seam of quartz grain

Examples

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Embodiment 1

[0030] Please refer to Figure 1a , the embodiment of the present invention provides a kind of method based on man-made rock core technology to evaluate the development degree of the inner fracture of quartz grain, comprising the following steps:

[0031] (1) Take (less than 10 mesh) sand and 20% volume white cement according to the volume percentage and mix and stir evenly to obtain a mineral powder mixture, add distilled water equal to the volume of white cement, and mix and stir to obtain artificial rock core raw materials. The volume percentage of sand and white cement is 5:1.

[0032] (2) A circle of polytetrafluoroethylene film is placed close to the inner wall of the core tube, and then the uniformly stirred raw materials are placed in it and pre-compacted.

[0033] (3) Heat and pressurize (100° C., 20 MPa) to prepare artificial sandstone cores.

[0034] (4) The artificial rock core made into ordinary thin slices, observed under a microscope, and counted 4mm 2 The num...

Embodiment 2

[0036] Please refer to Figure 2a , the embodiment of the present invention provides a kind of method based on man-made rock core technology to evaluate the development degree of the inner fracture of quartz grain, comprising the following steps:

[0037] (1) Take (10-16 mesh) sand and 20% volume white cement according to the volume percentage, mix and stir evenly to obtain a mineral powder mixture, add distilled water equal to the volume of white cement, and mix and stir to obtain artificial rock core raw materials. The volume percentage of sand and white cement is 5:1.

[0038] (2) A circle of polytetrafluoroethylene film is placed close to the inner wall of the core tube, and then the uniformly stirred raw materials are placed in it and pre-compacted.

[0039] (3) Heat and pressurize (100° C., 20 MPa) to prepare artificial sandstone cores.

[0040] (4) The artificial rock core made into ordinary thin slices, observed under a microscope, and counted 4mm 2 The number of cr...

Embodiment 3

[0042] Please refer to Figure 3a , the embodiment of the present invention provides a kind of method based on man-made rock core technology to evaluate the development degree of the inner fracture of quartz grain, comprising the following steps:

[0043] (1) Take sand (greater than 32 mesh) and 20% volume of white cement according to the volume percentage, mix and stir evenly to obtain a mineral powder mixture, add distilled water equal to the volume of white cement, and mix and stir to obtain artificial rock core raw materials. The volume percentage of sand and white cement is 5:1.

[0044] (2) A circle of polytetrafluoroethylene film is placed close to the inner wall of the core tube, and then the uniformly stirred raw materials are placed in it and pre-compacted.

[0045] (3) Heat and pressurize (100° C., 20 MPa) to prepare artificial sandstone cores.

[0046] (4) The artificial rock core made into ordinary thin slices, observed under a microscope, and counted 4mm 2 The...

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Abstract

The invention discloses a method for analyzing the development degree of inner seams of quartz grains. The method for analyzing the development degree of the inner seams of the quartz grains comprisesthe following specific steps: changing the grain size of sand, the volume ratio of the sand to white cement, and the axial pressure in the artificial rock process to prepare corresponding sheets;; and counting the crack densities in all the sheets to obtain the grain size of sand, the volume ratio of sand to white cement and the influence of the axial pressure of the artificial rock on the crackdensity of an artificial rock core, and analyzing the natural quartz grain crack development degree on the basis. According to the analysis method of the invention, a quartz grain inner seam generation process can be simulated, diagenetic conditions can be quantitatively controlled, thus the influence of the diagenetic conditions on the development degree of the inner seams of the quartz grains can be known, the development degree of the inner seams in the quartz grains can be accurately analyzed through the known diagenetic conditions, and the oil and gas field exploitation work is facilitated.

Description

technical field [0001] The invention relates to the technical field of petroleum geology, in particular to a method for analyzing the development degree of inner fractures in quartz grains. Background technique [0002] Quartz is the main rock-forming mineral and an important component of clastic rocks. The chemical properties of quartz are stable, and it is difficult for quartz to undergo dissolution reaction during the diagenesis process. Quartz has a relatively high Mohs hardness (up to 7) and is a rigid particle. Unlike plastic particles that undergo plastic deformation and pseudohybridization to fill pores when undergoing compaction, rigid particles will support intergranular pores when undergoing compaction, reducing compaction and resulting in reduced intergranular pores. However, when the compaction reaches a certain level, intragranular cracks will be generated inside the rigid particles to offset the overlying stress. Intragranular fractures will have positive e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84
CPCG01N21/84
Inventor 覃硕石万忠王任冯芊
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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