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A method based on a well -measured curve and a natural scorching fast recognition method

A technology of well logging curves and identification methods, which is applied in the directions of testing machinery, earthwork drilling, wellbore/well components, etc. It can solve the problems of confusion between coal and natural coke, difficulty in distinguishing natural coke and coal, and difficulty in distinguishing, so as to achieve identification The effect of fast speed, high accuracy and convenient operation

Inactive Publication Date: 2017-04-05
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In the process of coal field exploration, from the point of view of coring, it is often found that natural coke and coal seams are interbedded with each other. In actual work, coal and natural coke are often confused, especially anthracite and natural coke are the most difficult to distinguish. In well drilling, it is difficult to distinguish natural coke and coal only by using a single index of the well logging curve. Therefore, it is necessary to obtain a method for quickly identifying coal or natural coke according to the characteristics of natural coke and coal in the well logging curve

Method used

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  • A method based on a well -measured curve and a natural scorching fast recognition method
  • A method based on a well -measured curve and a natural scorching fast recognition method
  • A method based on a well -measured curve and a natural scorching fast recognition method

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Embodiment 1

[0036] In this embodiment, the specific steps for realizing the rapid identification of coal and natural coke are as follows:

[0037] Step 1: Select a well where both coal and natural coke have been cored. The selected well has logging curves, including apparent resistivity, natural gamma, artificial gamma, spontaneous potential, sound velocity, apparent density, and Poisson ratio curve;

[0038] Step 2: Determine the layer and thickness of coal and natural coke according to the macroscopic characteristics and coal sample analysis results in the cored drill hole, first sample the coal or natural coke, and take 5 coal or natural coke samples and the above comprehensively determine coal and natural coke from the following three aspects:

[0039] (1) Analyze the macroscopic characteristics of coal or natural coke, and observe the coal or natural coke, in which the color is gray-black-black-steel gray, the streak color is gray-brown, brittle, brittle and powdery, fine- Medium-s...

Embodiment 2

[0063] In this embodiment, coal geological exploration is carried out in a certain mining area, mainly for geological work such as drilling and logging. Among them, drilling requires most of the coring, especially for coal samples. After actual exploration, it is found that there are natural coke and coal in the mining area. layer phenomenon. Distinguishing coal from natural coke proceeds as follows:

[0064] The first step is to find a coal and natural coke core with both samples and well logging curves, and conduct intensive sampling, usually at intervals of 20cm, and the number of samples reaches 12;

[0065] The second step is to determine coal and natural coke through macroscopic or microscopic and experimental tests on the basis of the sampled samples:

[0066] (1) After macroscopic observation and sampling test of existing rock cores, it is found that the coal is mainly high-metamorphic bituminous coal and anthracite, and at the same time, coal and natural coke are par...

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Abstract

The invention belongs to the field of coal field geology, and relates to a method for quickly identifying coal and natural coke based on well logging curves. Firstly, the well logging curves are selected for drilling, and the coal and natural coke are determined based on macroscopic characteristics and coal sample analysis results in cored boreholes. The stratum and thickness of natural coke, and then on the basis of the determined natural coke and coal, find out the borehole logging curve, read out the data of different logging curves of coal and natural coke, and record them at the same time, and then according to different The maximum and minimum values ​​of the logging curve, determine the distribution range of the coal and natural coke logging curves, and establish the coal and natural coke logging response value change table, and then predict the coal or natural coke that only has logging data, and realize coal and natural coke. Rapid identification with natural coke; the process is simple, the operation is convenient, the principle is scientific, the identification speed is fast, and the accuracy is high.

Description

[0001] Technical field: [0002] The invention belongs to the field of coal field geology, and relates to a method for quickly identifying coal and natural coke based on well logging curves, in particular to a method for distinguishing anthracite and natural coke in coal field geological exploration, which is used for coal and natural coke in coal field geological exploration Identification and Reserve Estimation. [0003] Background technique: [0004] Drilling, well logging and seismic in coal field geological exploration are important methods for coal seam exploration. Among them, the combination of drilling and well logging has become an important means of exploration in recent years. However, during the drilling process, coring is an important work, but the actual Some formations (such as coal seams) above have not been sampled due to actual operation or drilling requirements. Therefore, when making predictions, it is necessary to rely on logging work. Logging is to judge ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B49/02E21C39/00
CPCE21B49/00E21B49/02E21C39/00
Inventor 吕大炜刘海燕李增学王东东王绪冰勇鹏林杨庆
Owner SHANDONG UNIV OF SCI & TECH
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