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Method for calculating electrical evaluation standard of coal seam surrounding rock water yield property

A technology of evaluation standards and calculation methods, which is applied to earth-moving drilling, surveying, wellbore/well components, etc. It can solve the problems of long model establishment and analysis cycle, many factors to consider, and poor economic benefits, and achieve model establishment and analysis. Short cycle, strong universality, cost-saving effect

Pending Publication Date: 2021-07-23
SHAANXI ZHENGTONG COAL IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] A large amount of data needs to be obtained, many factors to consider, and poor representativeness;
[0010] The required equipment and instruments have high requirements, high cost, and poor economic benefits;
[0011] Long testing time, long model building and analysis cycle

Method used

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  • Method for calculating electrical evaluation standard of coal seam surrounding rock water yield property
  • Method for calculating electrical evaluation standard of coal seam surrounding rock water yield property

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Effect test

Embodiment 1

[0049] This embodiment provides a specific structure of the calculation method of the water-rich electrical property evaluation standard of the surrounding rock of the coal seam, such as figure 1 shown, including the following steps:

[0050] Establish the electrical and lithological interpretation template of the coal seam surrounding rock, and screen the aquifer based on the lithology discrimination conditions of the aquifer;

[0051] Create a template for the interpretation of physical properties of the aquifer;

[0052] Determine the lower limit of the physical properties of the aquifer, and screen out the aquifer;

[0053] Calculate the water-richness evaluation index of the aquifer, and establish the water-richness electrical property evaluation standard of the aquifer based on the water-richness classification standard of the aquifer.

[0054] Specifically, an interpretation template for the electrical properties and lithology of the surrounding rock of the coal seam ...

Embodiment 2

[0078] In this embodiment, the T1 borehole flow logging in the Gaojiabao mining area is taken as an example. The T1 borehole flow logging results and water-rich evaluation results in the Gaojiabao mining area are shown in the following table. Among them, for the 620-660m well section and 680-700m well section, the evaluation index Q is 1.26L / (s m) and 1.10L / (s m) respectively. The classification standard is determined as strong water-rich aquifer, and the lower limit standard for calculating the porosity of the strong water-rich aquifer in the Gaojiabao mining area is 20%. The calculation method is:

[0079] PORlow=(23.8*21.1+13.6*18.6) / (23.8+13.6)≈20%

[0080] Similarly, the lower limit standard of Vsh for strong water-rich aquifer in Gaojiabao mining area is calculated as 18%.

[0081] The flow logging and water-rich evaluation table of Well T1 in the Gaojiabao mining area are as follows:

[0082]

[0083] From this calculation conclusion, it is determined that the elec...

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Abstract

The invention discloses a method for calculating an electrical evaluation standard of coal seam surrounding rock water yield property. The method comprises the following steps of 1, establishing a coal seam surrounding rock electrical property and lithology interpretation template, and screening to obtain a water-bearing layer based on a water-bearing layer lithology discrimination condition; 2, establishing a physical property interpretation template of the water-bearing layer; 3, determining a physical property lower limit value of the water-bearing layer, and screening to obtain a water-rich layer; and 4, calculating a water-rich layer water yield property evaluation index, and establishing the water-bearing stratum water yield property electrical evaluation standard based on a water-bearing layer water yield property division standard. The invention relates to the technical field of coal mining. The method is high in universality of used data, few in data type and high in practicability; the requirements on equipment and instruments are low, the evaluation conclusion has extremely high coverage and representativeness, and the cost is saved; the water yield property of the water-bearing layer can be evaluated on each single sand layer and can be accurate on logging data of eight points per meter, and the obtained data is more accurate.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for calculating a water-rich electric property evaluation standard of coal seam surrounding rocks. Background technique [0002] Mine water damage is a major threat to the safety of coal mine production, and water inrush (gushing) in sandy (conglomerate) rock aquifers on the roof and floor of coal seams is one of the important disaster types. The water-richness of the aquifer is one of the important factors affecting the intensity of mine water hazards. Therefore, the evaluation of the water-richness of the coal seam surrounding rock aquifer is the basic work for the prevention and control of mine water hazards. [0003] In the "Detailed Rules for Prevention and Control of Water in Coal Mine", the water-richness classification standard of aquifers is defined as: [0004] 1. Weak water richness: q≤0.1L / (s m); [0005] 2. Medium water richness: 0.1L / (s m)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00
CPCE21B49/00E21B49/005E21B47/00
Inventor 张金魁任邓君侯涛王青振马骥陈庆李鹏王璞
Owner SHAANXI ZHENGTONG COAL IND CO LTD