Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 124-132.doi: 10.12108/yxyqc.20180314

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Application of Wheeler transform combined with time-frequency analysis technology to lithologic reservoir characterization of Bohai Oilfield

LIU Teng, WANG Jun, ZHANG Jingsi, ZHANG Li, CAI Shaowu   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2017-11-02 Revised:2018-01-13 Online:2018-05-21 Published:2018-05-21

Abstract: In order to study the reservoir accumulation model of lithologic reservoirs and find favorable exploration zones in block A in the gentle slope zone of Shijiutuo uplift,we need to characterize the distribution of sedimentary systems and analyze the preservation conditions and updip sealing conditions of oil and gas in the reservoir top and bottom plate. This paper firstly used time-frequency analysis technology to divide the 2D sedimentary systems of wells,and then used the Wheeler transform based on seismic data to promote the results of wells to the 3D space,to promote the rapid establishment of fine sedimentary systems framework, and carried out reservoir prediction and preservation condition analysis. The results show that: (1)adjacent to Qinnan hydrocarbonrich generation depression,the gentle slope zone in Shijiutuo uplift has good conditions for hydrocarbon collection; (2)the long-term active fault in the study area together with sand bodies in delta formed a double-type transport network,which is beneficial for the formation of lithologic reservoirs; (3)the nose-shaped structure in the gentle slope zone is an important direction and track of hydrocarbon migration,once the area in the updip direction has good sealing conditions,it can form oil and gas reservoirs. Overall, block A has favorable preservation and sealing conditions, so it is a favorable exploration zone of lithologic reservoirs.

Key words: rock, core, mercury injection, mercury injection curve, capillary pressure, constant-speed mercury injection, pore, pore-throat ratio

CLC Number: 

  • TE19
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