Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 85-96.doi: 10.12108/yxyqc.20200608

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Discussion on seismic identification characteristics and controlling factors of sediment bypass

SHANG Wenliang1,2, XU Shaohua1,2, CAI Molun3, GAO Hongcan1,2, LI Xiaogang1,2, CHEN Cen1,2, CAI Change1,2, QIN Lei1,2   

  1. 1. Chongqing Key Laboratory of Complex Oil & Gas Exploration and Development, Chongqing 401331, China;
    2. School of Petroleum Engineering, Chongqing University of Science & Technology, Chongqing 401331, China;
    3. Geological Exploration & Development Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610051, China
  • Received:2020-04-08 Revised:2020-05-07 Online:2020-12-01 Published:2020-10-30

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Abstract: At present,most of researches on sediment bypass are focused on explaining the non-deposition that occur in continental shelves or slopes,but the main controlling factors of sediment bypass are still not clear. By collecting domestic and foreign cases of sediment bypass and making comparative analysis on different cases, the identification signs of sediment bypass on seismic profiles and the main controlling factors of sediment bypass have been ascertained. The result shows:(1)Sediment bypass represents depositional break,and appears as the merging of seismic events of the top and bottom formation in seismic profile. (2)Sediment bypass mostly occurs on above-graded slope,and the filling stages of different accommodation spaces(ponded-basin accommodation space,healed-slope accommodation space and slope accommodation space)in above-graded slope provide potential areas for sediment bypass.(3)Sediment grain size,concentration,fluid flow,and slope determine whether the sediment can pass by. Among them,sediment grain size and fluid flow are the main factors that affect the turbidity currents bypass. Sediment concentration is the main factor that affects the debris flow. (4)The controlling effect of slope on sediment bypass is reflected in two aspects:absolute gradient difference and relative slope ratio of adjacent formation. Relative slope ratio is an important condition for the start of sediment bypass. The absolute slope difference determines the distance of sediment bypass. The smaller the absolute gradient difference is,the shorter the bypass distance is;the larger the absolute gradient difference is,the longer the bypass distance is. This research is helpful to deepen the understanding and knowledge about the sediment transport process,and also has reference for future research of sediment bypass.

Key words: sediment bypass, above-graded slope, accommodation space, relative slope ratio

CLC Number: 

  • P512.2
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