Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (6): 794-803.doi: 10.11743/ogg20060610

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Patterns of natural gas accumulation and enrichment in Dongpu depression

Jiao Daqing, Wang Deren, Wu Xiaoling   

  1. Zhongyuan Oilfield Company, Sinopec, Puyang, Henan 457001
  • Received:2006-10-16 Online:2006-12-25 Published:2012-01-16

Abstract:

Dongpu depression is one of the few basins in China that are abundant with both oil and gas.Two sets of Paleozoic and Cenozoic source rocks,with deep burial depth and high thermal maturity,have gone through complicate history of bury,thermal evolution,and hydrocarbon generation.Good cap rocks represented by halite are well developed.Various types of sandbodies provide the depression with favorable accumulation conditions.Traps in the depression are of various types and the timing of their formation and hydrocarbon generation is ideal.Furthermore,the structural framework(two sags,one uplift,and one slope)of the depression and the abnormal high pressure in some part of the depression make it a favorable place for the migration and accumulation of hydrocarbon.Three types of gas reservoirs,including coal-derived gas,condensate gas and mixed gas,are recognized in the depression.The coal-derived gas reservoirs mainly occur in the top of central uplifts,condensate gas reservoirs mainly occur around the sags,and the mixed gas reservoirs are distributed in between.

Key words: coal-derived gas,condensate gas,gas pool, gas accumulation mode, Dongpu depression