Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 55-66.doi: 10.12108/yxyqc.20180607

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A new reservoir sand body resulted from interaction between turbidity flows and bottom currents: a case from Beijiao Sag of Qiongdongnan Basin

LI Yufeng1,2,3, PU Renhai3, TANG Ming4, YUAN Chao4, WU Shijiu4   

  1. 1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China;
    2. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510075, China;
    3. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;
    4. Research Institute of Zhanjiang Branch, CNOOC Ltd, Zhanjiang 524057, Guangdong, China
  • Received:2018-05-26 Revised:2018-08-31 Online:2018-11-16 Published:2018-11-16

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Abstract: Nowadays, geologists have mainly focused on channels originated from turbidite flows and perpendicular to continental margin slope, of which the field is now mature. In the deep-water environment, there is pervasive phenomenon for interaction between bottom currents and turbidity flows, of which the study is less. The interaction, resulting in parallel-slope channels, needs to be further researched urgently. Parallel-slope channels, however, are in the initial stage of research. The paleogeomorphology of Beijiao Sag was studied by using 2 D seismic data. Then the time-domain structure and root-mean-square amplitude of 3 D seismic data were used to comprehensively study the high-amplitude parallel-slope channels combined with the seismic profiles of 3 D region, sedimentary environment, sea level change and paleoclimate. The results show that Beijiao Sag was narrow-pathway shaped paleotopography in the Mid-Miocene. A parallel-slope channel with high amplitude was mainly distributed on the right side of narrow pathway in the northeastern Beijiao Sag, exhibiting multi-finger shaped or coneshaped. There was a progradation seismic reflection along the channel, and there were similar progradation seismic reflections and parallel-filling seismic reflections at the head and middle-tail of the channel in the crossing profile of channels, respectively. There was no tectonic fault beneath the parallel-slope in underlying strata. The parallelslope channel is a sedimentary result of interaction between turbidity flows and bottom currents associated with intermediate water, in the process of which fined grained debris such as mud was carried away by bottom currents and coarse-grained debris such as sand was deposited and filled within the channels. The channel is a new type of lithologic reservoir sandbody characterized by high porosity and high permeability. Finally, the main controlling factors consisting of paleoclimate and special paleotopography were analyzed and their sedimentary model was proposed. The channel has important paleoceanic and paleoclimate significance, which not only enriches the type of deep-water sandbody in China, but also is a potential replacement area for deep-water oil and gas exploration in the South China Sea. The channels should be paid attention to by petroleum geologists.

Key words: parallel-slope channel, interaction between turbidity flows and bottom currents, narrow pathway, new reservoir sand body, Beijiao Sag

CLC Number: 

  • TE121.3
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