High rank coal structure and log interpretation method of fracture pressure in Shouyang block

Authors

LI Songlin, CNOOC Energy Technology-Drilling & Production Co., Tianjin 300452, China
LI Zhongcheng, China United Coalbed Methane Corporation, Beijing 100022, China
WANG Lina, China United Coalbed Methane Corporation, Beijing 100022, China
DUAN Jing, China United Coalbed Methane Corporation, Beijing 100022, China
XIANG Nian, CNOOC Energy Technology-Drilling & Production Co., Tianjin 300452, China

Abstract

In order to accurately describe the distribution of surface subsidence basin, and based on the power exponential function model and the subsidence features, the surface subsidence basin model of long-wall working face along strike with gently inclined coal seam was established concerned the combination of theoretical analysis and numerical simulation method. The influencing factors of model parameters and the changing patterns of parameters were analyzed, and the applicability and the predicting accuracy of the model were verified. The results showed that parameter n reflected the range of the bottom size of the sinking basin, which was mainly related to the degree of mining. The values of n ranged from 1 to 3, and its value accuracy depended on the number of observation points. The parameter k reflected the convergence speed and subsidence influencing range of the edge of the sinking basin, which was mainly related to coal mining method, roof management method and the thickness of loose layer. The value of k was determined by the maximum of surface subsidence value or thickness of coal. In the prediction of surface subsidence in Changcun coal mine, the sum of squared differences between the predicted value and the measured value was 3.08×10⁶, and the median error was 267.59 mm, which was 6.47% of the maximum of subsidence value. The research is aimed at providing theoretical basis for the prediction and prevention of surface subsidence in Changcun coal mine.

Keywords

mining subsidence, subsidence basin model, gentle-inclined coal seam, model parameters, Changcun coal mine

DOI

10.3969/j.issn.1001-1986.2020.06.020

Recommended Citation

LI Songlin, LI Zhongcheng, WANG Lina, et al. (2020) "High rank coal structure and log interpretation method of fracture pressure in Shouyang block," Coal Geology & Exploration: Vol. 48: Iss. 6, Article 21.
DOI: 10.3969/j.issn.1001-1986.2020.06.020
Available at: https://cge.researchcommons.org/journal/vol48/iss6/21

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