Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 112-120.doi: 10.3969/j.issn.1673-8926.2018.01.011

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Lithofacies characteristics and identification methods of Mesozoic volcanic rocks in Bohai Sea

CAI Dongmei1, YE Tao2, LU Fengting2, GAO Kunshun2, REN Yunpeng2   

  1. 1. EnerTech-Drilling & Production Company, CNOOC Energy Technology & Service Limited, Tianjin 300459, China;
    2. Tianjin Branch, CNOOC China Ltd., Tianjin 300459, China
  • Received:2017-08-09 Revised:2017-11-02 Online:2018-01-21 Published:2018-01-21

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Abstract: With great control effects on volcanic reservoir forming, volcanic facies identification is an effective way to reduce the exploratory risk. Based on the geologic and drilling data,the types of volcanic facies were defined, and the lithofacies characteristics of Mesozoic volcanic rocks in Bohai Sea were analyzed through electrofacies analysis,seismic facies identification and seismic attribute analysis,and the identification methods for different types of lithofacies were studied. The results show that the Bohai Sea area is dominated by intermediate basic volcanic eruption,and the volcanic facies include eruptive facies,effusive facies,volcanic vent facies and volcanic sedimentary facies,dominated by effusive facies. The effusive facies has the characteristics of high resistance,low acoustic time difference,and the basic effusive facies has lower gamma ray value compared with neutral effusive facies. The eruptive facies is characterized by high acoustic time difference and low resistance,and the density of volcanic breccia is greater than that of tuff. From 3D seismic data,the eruptive facies and volcanic vent facies are mainly clutter reflection,with low frequency and medium amplitude,while Effusive facies are characterized by continuous and strong amplitude and low frequency,and volcanic sedimentary facies has the characteristics of continuous medium frequency and weak amplitude reflection. The eruptive facies and neutral effusive facies are favorable reservoir rocks in the study area.

Key words: sedimentary facies, reservoir characteristics, hydrocarbon accumulation, Chang 2 oil reservoir, Ordos Basin

CLC Number: 

  • TE122.2
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