Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 220-228.doi: 10.12108/yxyqc.20210120

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Reservoir prediction for weathering and leaching zone of bedrock buried hill based on seismic pre-stack depth migration

SUN Xiping1, ZHANG Xin1, LI Xuan1, HAN Yongke1, WANG Chunming1, WEI Jun2, HU Ying1, XU Guangcheng1, ZHANG Ming1, DAI Xiaofeng1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735000, Gansu, China
  • Received:2020-05-09 Revised:2020-08-04 Online:2021-02-01 Published:2021-01-25

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Abstract: The weathering crust of bedrock buried hill is an important field of oil and gas exploration. However, because of the deep buried depth,the complex surface and underground structure,it is difficult to obtain seismic imaging and the seismic amplitude is hard to be preserved. Moreover,it is difficult to predict the reservoir in weathering and leaching zone. In order to accurately depict the reservoir in weathering and leaching zone of bedrock buried hill,the velocity modeling technology from near-surface and amplitude-preserved pre-stack depth migration technology were used to improve the seismic imaging accuracy and amplitude preservation effect of complex structural area. Based on the layered characteristics of weathering and leaching zone of bedrock buried hill,combined seismic data with geological data,the internal layered structure of buried hill reservoir was established. The fracture distribution law was identified by using coherence cube and ant tracking technology,then combined with the classification characteristics of seismic amplitude,the effective thickness prediction of inner bedrock buried hill was carried out. The actual application in Ya'erxia buried hill proved that the high-yield reservoir area delineated according to reservoir development made a good match with the reservoir thickness prediction of the weathering and leaching zone by this method. This method can provide effective support for the characterization of inner reservoir targets in bedrock buried hill.

Key words: amplitude-preserved pre-stack depth migration, bedrock buried hill, weathering and leaching zone, depth domain interpretation, reservoir prediction, fracture prediction

CLC Number: 

  • P631.4
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