Characteristics of in situ stress and its influence on coal seam permeability in the Liupanshui Coalfield, Western Guizhou

Xiaojie Fang; Caifang Wu; Xiuming Jiang; Ningning Liu; Dan Zhou; Yiwen Ju

doi:10.1002/ese3.950

journal article Open Access Jul 22, 2021

Characteristics of in situ stress and its influence on coal seam permeability in the Liupanshui Coalfield, Western Guizhou

Xiaojie Fang

Energy Science & Engineering Vol. 9 No. 10 pp. 1773-1786 · Wiley

View at Publisher Save 10.1002/ese3.950

Abstract

AbstractThe current in situ stress regime is of great significance to the exploration and development of coalbed methane (CBM). In this study, the vertical stress (), maximum horizontal principal stress (), and minimum horizontal principal stress () in the Liupanshui Coalfield were studied. Variations of the maximum and minimum envelopes and trend lines of the lateral pressure coefficient () with depth were obtained, and the non‐monotonic decrease of permeability with burial depth was determined. On this basis, the effect of in situ stress on the coal reservoir permeability was evaluated. The results show that the average vertical stress gradient of the main coal seam in the Liupanshui Coalfield is 0.024 MPa/m. Generally, there are two stress regimes of > > (44.23%) and > > (46.15%); > > accounts for a smaller proportion (9.62%), and only occurs in relatively shallow coal seams (<622.85 m). In the range of the tested burial depths, for <600 m, > > is dominant; > > is dominant between 600 and 800 m; and between 800 and 980 m, the coal reservoir is affected by both > > and > > , representing a transition zone between the two stress states. With the increase of burial depth, the permeability of the coal reservoir shows a complex non‐monotonic decline, and the variation of the permeability of the coal reservoir differs under the influence of different stress regimes. Further analysis shows that under the background of stress regime transformation, permeability is mainly affected by the stress value, horizontal principal stress difference, stress regime, and coal cleat, indicating that in situ stress is the main controlling factor of coal reservoir permeability in the Liupanshui Coalfield.

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Published: Jul 22, 2021
Vol/Issue: 9(10)
Pages: 1773-1786
License: View

Authors

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Xiaojie Fang