西南石油大学学报(自然科学版)

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Review on the Characteristic of Kazhidumi Reservoir in SA Oilfield,Iran

Du Yang1,2*, Xin Jun2, Chen Jie1, Wang Weibing1, Tong Mingsheng1   

  1. 1. School of Geoscience and Geotechnology,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Geology and Exploration Research Institute of CCDC,CNPC,Chengdu,Sichuan 610051,China
  • Online:2015-12-01 Published:2015-12-01

Abstract:

Considering the issues of the complex oil-water relationship,ambiguous oil-water contact and unclear reservoir
characteristic of the Kazhidumi in SA Oilfield,southwest Iran. We study the Kazhidumi reservoir character and its formation
mechanism by uitilizing the coring,well-logging and 3D seismic data. Firstly,Kazhidumi formation was divided into 4 zones
by sequence stratigraphy,and recognize the sandbody features in different zones. Secondly,trap evolution history of Kazhidumi
is displayed by layer flattening technique on 3D seismic data and mainly show as:paleo-trap of Kazhidumi is the giant anticline
which situated in the north of current field area before the Zagoros orogeny. Impact by the Zagros orogeny,the paleo-trap
shrink and the high point shifts to east,in the mean time,southern area was uplifting then forming a new secondary trap. Trap
alteration breaks the paleo-reservoir equilibrium and cause the oil secondary migration. In the northern high point(paleo-trap),
the oil migrates from west to east then form the“sacled-down version”retention reservoir,while some part migrate to southern
secondary trap and form the new reservoir. The phenomenon of“upper water and bottom oil”in the current northern high
point is the lensing retention oil and water layer after secondary migration. Kazhidumi reservoir is the layer reservoir with edge
water and mainly controlled by the structure. According to the new recognition,we propose the corresponding development
suggestions.

Key words: Iran, Kazhidumi reservoir, reservoir characteristics, structural evolution, development suggestion

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