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State-owned China National Offshore Oil Corporation has announced the discovery of its first deep coalbed methane field. Located at around 4,921 feet in northwest China's Shaanxi Province, the coalbed has reported reserves of over 3,885 billion cubic feet . Thewill provide essential energy security for China and enable the country to boost production of unconventional oil and gas resources, explains CNOOC. CBM called coal seam gas , is natural gas found within coal seams.
Coalbed methane is a unique type of gas found in coal deposits. Unlike conventional gas reservoirs, the methane in coalbeds is stored through adsorption. The methane is almost in a liquid form, coating the inside pores in the coal, called the matrix. The cleats, the open fractures in the coal, may contain free gas or be filled with water.
The thickness of a single layer of the coal seam within the Shenfu deep CBM field varies between 20 feet to 76 feet , and the average gas content per tonne of coal is approximately 530 cubic feet . Over 100 exploratory wells have been dug in the area, with the maximum daily gas output of 918,181 cubic feet per well.
Shenfu is the second significant coalbed methane discovery by CNOOC, following the Linxing field, which has similar volumes of proven gas in place. Xu Changgui, deputy chief exploration engineer of CNOOC, stated that the deep CBM field discovery showcases the vast potential for exploration and development on the eastern edge of the Ordos Basin.
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