Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (6): 746-753.doi: 10.11743/ogg20050609

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Characteristics of diagenesis and pore evolution of gas reservoirs formed in different tectonic settings

Liu Chenglin1, Zhu Xiaomin1, Zhu Yuxin2, Zeng Qingmeng1   

  1. 1. China University of Petroleum, Beijing;
    2. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing
  • Received:2005-09-27 Online:2005-12-25 Published:2012-01-16

Abstract:

Gas reservoirs in craton basins have experienced multicyclic tectonic movement during the long geologic history,resulting in varied diagenetic environments,complex diagenesis and long-term superimposition.Their pores have experienced several cycles of evolution and the present porosities of reservoirs are low.According to the structural location,trap type and reservoir nature,the gas reservoirs can be further subdivided into three types,including palaeohigh structural gas reservoirs,anticlinal gas reservoirs,and lithologic gas reservoirs.Their diagenetic sequences and pore evolutions are somewhat different.Gas reservoirs in the thrust belt and slope zone of foreland basin are characterized by their relatively short geologic histories,relatively less tectonic cycles,relatively rapid burial and relatively simple diagenetic sequence and pore evolution,so the present porosities are relatively small.While gas reservoirs in rift basin are characterized by their short geologic histories,less tectonic(cycles),rapid burial and simple diagenetic sequence and pore evolution,so the reservoirs have relatively large(porosities.)

Key words: rift, foreland, craton, diagenetic sequence, gas reservoir

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