Oil & Gas Geology ›› 2007, Vol. 28 ›› Issue (2): 299-308.doi: 10.11743/ogg20070224

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The impact of saline deposit upon the hydrocarbon accumulation in petroliferous basin

Zhao Zhenyu1,2, Zhou Yaoqi1,2, Ma Xiaoming2, Ji Guosheng2   

  1. 1. Institute of Petroleum Resources and Environment, China University of Petroleum, Dongying, Shandong, 257061;
    2. School of Earth Resources and information, China University of Petroleum, Dongying, Shandong, 257061
  • Received:2006-11-27 Online:2007-04-25 Published:2012-01-16

Abstract:

Saline-deposits in most basins are formed through evaporation and some are the products of deep thermal brine.Research shows that(1) the formation environments for saline deposits,dominated by evaporate environments in continental lake basins,are favorable for the preservation of organic matters and the generation of hydrocarbon;(2) the upward intrusion of deep thermal fluid enhances transformation ratio of hydrocarbon in source rocks and provides for the formation of inorganic oil and gas accumulations;(3) saline deposits are favorable for the maintenance of high porosity and the formation of secondary pores and fissures in the underlying strata,but sometimes they may cause the plugging of the primary pores,and apart from that,saline deposits themselves serve as excellent hydrocarbon migration pathways or reservoir space.Their presence is regarded as an important condition for the formation of the underlying abnormally-high pressure systems,thus is favorable for the preservation of oil and gas pools;(4) saline deposits have wonderful sealing capacity and make good cap rocks by themselves or in combination with faults;(5) saline deposits have an impact upon the regional structural styles of layers above and under it and controls over migration pathways and accumulation horizons.

Key words: petroliferous basin, saline deposit, hydrocarbon accumulation

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