西南石油大学学报(自然科学版)

Previous Articles     Next Articles

Physical Simulation of Oil and Gas Backflow and Its
Geological Significance

Wang Yongshi1, Shan Yixian2, Lao Haigang3   

  1. 1. Geoscience Research Institute of Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257015,China
    2. School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China
    3. College of Mining Engineering,Hebei United University,Tangshan,Hebai 063009,China
  • Online:2014-04-01 Published:2014-04-01

Abstract:

The exploration practice proves that the phenomenon of the oil and gas backflow exists in Chezheng Depression,
the physical simulation experiments of the oil and gas accumulation confirmed that there are two types of oil and gas intrusion
in hydrocarbon migration process,i.e. fracture as migration channel and the sand body framework as migration channel,the
former is the important channel of the oil and gas backflow,however molecular replacement is the formation mechanism,and
the oil and gas pool is of small size. the latter in sand body framework for migration of oil and gas intrusion,is that pressure
difference controlling petroleum downward migration is an important driving force. The desired maximum pressure depends on
the related physical property of sandbody,and it can form large-scale oil and gas reservoirs. The research provides theoretical
support for the expansion of deep oil and gas exploration in petroliferous basin.

Key words: oil and gas backflow, fracture, sand body, molecular replacement, pressure difference