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《Geochimica》 2008-03
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Kinetics of primary and secondary generation of coal-derived gases and its application to genesis of natural gases found in Gubei area, Zhanhua Depression

JIN Qiang1*, WANG Xiu-hong1, HU Xiao-qing1, WANG Li1, WANG Juan1 and SONG Guo-qi2 1. College of Geo-Resources and Information, China University of Petroleum, D ongying 257061, China; 2. Shengli Oilfield Company, Sinopec, Dongying 257015, China  
Coal-derived gas is discovered from the Gubei area in the Zhanhua Depression. It is important for explorers to know that the gas is a primary generating gas from Mesozoic burial history or a secondary one from Tertiary reburial history. Having investigated the geological evolution of the C-P coal sequence in the Gubei area, the authors conducted a series of pyrolysis experiments on the primary and the secondary hydrocarbon generation from the coal samples and calculated the kinetic parameters for the total hydrocarbons and some individual hydrocarbons derived from the pyrolysis. It is found that the active energy of the total hydrocarbon generated from the secondary pyrolysis from the coal samples is 40-50 kJ/mol greater than that from the primary pyrolysis, which means that the coal sequence generated secondly hydrocarbons at re-burial depth greater than 4200 m (corresponding to Ro=0.9%). Compared with the hydrocarbon derived from the primary pyrolysis, the hydrocarbons generated from the secondary pyrolysis are characteristics of iC4/nC4 1, n(C6+C7)/i(C6+C7) 0.8 and methal-benzol/benzol 1.2. It is concluded that the coal-derived gas discovered from the Gubei area may be the secondary pyrolysis products from the C-P coal sequence in Late Tertiary.
【Fund】: 国家自然科学基金(40572084 40272061)
【CateGory Index】: P618.13
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