Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (5): 56-59.doi: 10.3969/j.issn.1673-8926.2011.05.011

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Oil and Gas accumulation characteristics of nearshore subaqueous fan in Hongze Sag

ZHANG Tao, ZHANG Shiying   

  1. Shanghai Branch of CNOOC Ltd., Shanghai 200030, China
  • Online:2011-10-20 Published:2011-10-20

Abstract:

The sedimentary system types and contribution are controlled by tectonic features in Hongze Sag. The steep slope zone in the southeast develops nearshore subaqueous fan sedimentary system. The exploration practice reveals that the difference among different parts of nearshore subaqueous fan is obvious. The accumulation conditions and characteristics of different subfacies are studied in order to clarify the main exploration direction of nearshore subaqueous fan. The result shows that fan foot is composed of compacted glutenite rocks and reservoir can not be easily accumulated. The midfan and fanhead are interbedded by sandstone and mudstone. The sandstone has good reservoir capacity and it is updip pinchouting in mature lacustrine source rocks, so it can form a variety of tectonic-lithologic and lithologic reservoirs. Therefore, the midfan and lower-fan are the main exploration target zones of nearshore subaqueous fan.

Key words: oil and gas accumulation, trap, lithologic reservoirs, hill reservoir, exploration targets, Lengjia-Leijia area

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