Method for comprehensively recognizing sedimentation hiatal surfaces in ultra-thick seam

A technology of internal deposition and discontinuity, applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of harsh sampling conditions, high testing costs, no research results published, etc., to achieve high accuracy, strong reliability, Easy and flexible identification method

Inactive Publication Date: 2015-12-30
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0007] The reliability of the results identified by a single method is questionable, and it needs to rely on intensive sampling in the field and a large number of experimental tests. The sampling conditions are harsh, the test cost is high, and there are many restrictions.
[0008] In addition, no further research results have been published worldwide

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  • Method for comprehensively recognizing sedimentation hiatal surfaces in ultra-thick seam
  • Method for comprehensively recognizing sedimentation hiatal surfaces in ultra-thick seam
  • Method for comprehensively recognizing sedimentation hiatal surfaces in ultra-thick seam

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[0073] Example analysis: Taking the extremely thick coal seam in the BC area as an example, four water-progressive discontinuities can be identified, numbered T1, T2, T3, T4 and three water-regressive discontinuities, numbered R1, R2, R3, from bottom to top, shows 3 hydraulic advance-regression cycles and a half hydraulic cycle (see figure 2 ). figure 2It is a schematic diagram of the coal quality composition discrimination method and sedimentary discontinuity in extremely thick coal seams. The higher percentage of vitrinite in the figure reflects the reduction environment of deep water body, and the higher percentage of inertinite reflects the shallower water body. Oxidizing environment, the higher the vitrinite ratio, the more vitrinite and the less inertinite, reflecting the deep water and oxidative environment. That is to say, the water-adgressive discontinuity shows high vitrinite volume percentage, high vitrinite ratio, and low inertinite volume percentage; the water-...

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Abstract

The invention discloses a method for comprehensively recognizing sedimentation hiatal surfaces in an ultra-thick seam. The sedimentation hiatal surfaces in the ultra-thick seam are comprehensively recognized according to five parameters acquired through coal petrography and coal quality analysis, microelement analysis, organic matter stable carbon isotope analysis, one-dimensional continuous wavelet transformation of log data and Milankovitch cycle analysis of the log data; growth control factors of the sedimentation hiatal surfaces are explained from the origin essentially through recognition of Milankovitch cycles in the ultra-thick seam, the root cause of growth of the sedimentation hiatal surfaces is found out, and the accuracy and the credibility of the sedimentation hiatal surfaces are greatly improved. Besides, weight scoring is performed according to sensitivity of different recognition methods, the recognized sedimentation hiatal surfaces are correspondingly assigned, the scores obtained with all the methods are added up, and the reliability of the sedimentation hiatal surfaces is described quantitatively. The recognition method is convenient and flexible and has better practicability.

Description

technical field [0001] The invention relates to a method for comprehensively identifying internal sedimentary discontinuities of extremely thick coal seams from the aspects of coal quality characteristics, trace element analysis, logging data processing, etc., and is especially suitable for identifying internal sedimentary discontinuities of extremely thick coal seams accumulated in situ. Background technique [0002] In the classification of coal seam thickness, coal seams with a single layer thickness greater than 8m are called "extremely thick coal seams" (Yang Qi, Han Dexin, 1979). Many coal seams with huge thickness have been discovered all over the world, such as the single coal seam thickness of 244.7m in the Shengli Coalfield of Erlian Basin in China, and the single coal seam thickness of 200m in the Kerr gold mining area of ​​Qiliangbin Coalfield in the Soviet Union. It is well known that the evolution process from peat to coal seam is a process of continuous compac...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 王东东李增学吕大炜刘炳强刘海燕王平丽邵凯付文钊于得明
Owner SHANDONG UNIV OF SCI & TECH
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