LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (2): 38-45.doi: 10.3969/j.issn.1673-8926.2015.02.007

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Study on occurrence features of coalbed methane in Heyang area ， Ordos Basin

Y I Wei1， X IONG Xianyue1， WANG Wei1， L IU Ling2   

  1.  1. Hancheng Branch ， PetroChina Coalbed Methane Company Ltd. ， Hancheng 715400 ， Shannxi ， China ；2.Yanchang Oilfield Company Ltd. ， Yan ’ an 716000 ， Shannxi ， China
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

Heyang area in Ordos Basin is an important block of coalbed methane exploration in our country, so to study the occurrence features of coalbed methane and predict coalbed methane resources is necessary for field development. This paper analyzed the occurrence of coalbed methane in this area in respect of coalbed methane reservoir characteristics including burial depth and thickness of coal layer, features of coal, adsorption and pressure of coal reservoirs, permeability of coal reservoirs, as well as gas content. The results show that the preservation conditions of coalbed methane are advantage. The main coal-bearing strata are Shanxi Formation and Taiyuan Formation of the Permian, containing 11 layers coal, of which 4 layers are recoverable or partially recoverable, the cumulative thickness of coal seam is about 11 m, and the main coal seam is NO.5, of which the thickness is more than 3 m. The coals are dominated by lean coal with high ash and low volatile. Less affected by the destruction of tectonic activity, the original structure of coal is more complete, and the gas content of coal reservoir is high and the adsorption is strong. The prediction result of coalbed methane resources in this area shows that coalbed methane mainly occurs in coal layers shallower than 1 600 m with a cumulative coalbed methane resource volume of 442.72× 108 m3. Among them the coalbed methane resource volume with buried depth shallower than 1 300 m is 335.01×108 m3.

Key words:  shallow water delta, sedimentary characteristics, the fourth member of Quantou Formation, Xingcheng area, northern Songliao Basin


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