Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 42-52.doi: 10.12108/yxyqc.20220405

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Seismic identification and gas-bearing prediction of large-scale submarine fans of Neogene Huangliu Formation in D13 area of Yinggehai Basin

WANG Lifeng, SONG Ruiyou, CHEN Dianyuan, XU Tao, PAN Guangchao, HAN Guangming   

  1. Hainan Branch, CNOOC China Limited, Haikou 570312, China
  • Received:2021-06-30 Revised:2021-09-09 Online:2022-07-01 Published:2022-07-07

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Abstract: Through the methods of sequence stratigraphy and seismic sedimentology,the large-scale submarine fans of Neogene Huangliu Formation in D13 area of Yinggehai Basin were dissected step by step,the channels in the fans were characterized and identified by multi-attribute fusion seismic slicing technology, and the gas-bearing sweet spots were predicted by the flat point reflection characteristics on seismic sections. The results show that:(1)The large-scale submarine fans in the study area were formed by the re-transportation of the paleo Lanjiang delta. Four stages of fan bodies retrograde successively were developed from southeast to northwest,and 11 stages of sand bodies can be identified. The top strata of the earlier fans were eroded by the later fans,and the sand bodies of the adjacent fans were connected vertically and locally.(2)The high-quality reservoirs in the submarine fans are mainly distributed in the submarine fan channel formed under strong sedimentary energy and high hydrodynamic force. The channel types such as bead-shaped channels,composite channels and meandering river shaped channels are developed in the fan,among which the large,thick and wide channels are the development areas of thick and high-quality sweet spot reservoirs.(3)The flat spot reflection characteristics on the seismic sections can be used to identify gas-bearing sweet spots in the channels. The flat spots in D13 area have the basic characteristics of near horizontal reflection in the channel,weakening reflection energy at the bottom of the channel, and slight inclination of the flat spot to the lower part.

Key words: submarine fan, gas-bearing sweet spot, multi-attribute fusion, flat spot reflection feature, Huangliu Formation, Neogene, D13 area, Yinggehai Basin

CLC Number: 

  • TE122
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