Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 60-68.doi: 10.3969/j.issn.1673-8926.2017.06.008

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Sandbody genesis and distribution regularity of Central Canyon in deepwater area of Qiongdongnan Basin

MAO Xuelian, ZHU Jitian, YAO Zhe, XU Shouli, TANG Lishan   

  1. Research Institute of Zhanjiang Branch, CNOOC, Zhanjiang 524057, Guangdong, China
  • Received:2017-09-17 Revised:2017-11-12 Online:2017-11-21 Published:2017-11-21

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Abstract: Lingshui A-2 gas field was discovered in deepwater area of Qiongdongnan Basin. Well drilling reveals that multi-period high quality thick layer of turbidity channel sandstone developed in Huangliu Formation in Central Canyon. The filled channel standstone was cut by the late muddy channel and reformed by MTDs. The stacked relationship of multi-period sandbodies is very complex. So,the genesis and distribution regularity of the Central Crayon filling sandbody in Qiongdongnan Basin were studied using 3 Dseismic and the latest drilling data. The results show that the Central Canyon at least developed four sets of thick and high-quality reservoirs which are sand of turbidite deposits and the lithologies are primarily grey fine sandstone and siltstone. The accumulation styles of sandbody are vertical isolation and lateral accretion,and it is segmented in the distribution of sandbody. Vertically,Ⅰ and Ⅱ sand groups developed throughout the entire canyon,but Ⅲ and Ⅳ sand groups only developed in the middle and lower of the canyon. Horizontally,sandbodies developed contiguously in the straight-low bending section of the canyon and were independent block developed in the medium-high bending section. In addition,it is of important significance for exploration to establish a pattern which is longitudinal overlap and horizontal continuous distribution of sandbody to predict similar sandbody distribution in the Central Canyon.

Key words: reservoir accumulation rules, migration system, Shawan Formation, Junggar Basin

CLC Number: 

  • TE122.2
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