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Coal and cokeite fast recognizing method based on logging curves

A technology of logging curves and identification methods, which is applied in the direction of testing machinery, earthwork drilling, wellbore/well components, etc., which can solve problems such as indistinguishability, confusion between coal and natural coke, and difficulty in distinguishing natural coke from coal, etc., to eliminate Contradictory, precisely determined effects

Inactive Publication Date: 2016-07-13
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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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  • Coal and cokeite fast recognizing method based on logging curves
  • Coal and cokeite fast recognizing method based on logging curves
  • Coal and cokeite fast recognizing method based on logging curves

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Embodiment 1

[0031] In this embodiment, the specific steps for realizing the rapid identification of coal and natural coke are as follows:

[0032] 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;

[0033] 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:

[0034] (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

[0058] 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:

[0059] 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;

[0060] The second step is to determine coal and natural coke through macroscopic or microscopic and experimental tests on the basis of the sampled samples:

[0061] (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 geology, and relates to a coal and cokeite fast recognizing method based on logging curves.The method comprises the steps that a drilled well is selected according to the logging curves, and the position and thickness of coal and cokeite are determined in a cored drilled hole according to gross features and a coal sample analysis result; the drilled hole logging curves are found out on a determined cokeite and coal foundation, and data of the different logging curves of the coal and the cokeite is read and recorded at the same time; the distribution range of the logging curves of the coal and the cokeite is determined according to the maximum value and the minimum value of the different logging curves, and a coal and cokeite logging response value change table is established; then the coal or cokeite only with the logging data is predicted, and fast recognition of the coal and the cokeite is achieved.The process is simple, operation is convenient, the theory is scientific, the recognition speed is high, and the accuracy rate is high.

Description

Technical field: [0001] 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. Background technique: [0002] 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 the nature of r...

Claims

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Application Information

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Patent Type & Authority Applications(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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