Classification of Internal-wave and Internal-tide Deposits in Deep Water and Significance to Petroleum Prospecting

Marine Origin Petroleum Geology ›› 2007, Vol. 12 ›› Issue (2) : 39-45.

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ISSN 1672-9854
CN 33-1328/P
PDF(376 KB)
Marine Origin Petroleum Geology ›› 2007, Vol. 12 ›› Issue (2) : 39-45.
Sedimentation and Reservoir

Classification of Internal-wave and Internal-tide Deposits in Deep Water and Significance to Petroleum Prospecting

  • Tong Yanming,He Youbin,Zhu Guanghui
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Abstract

According to current researching status, internal-wave and internal-tide deposits in deep water have been divided into two basic types of sedimentation, namely channel type and non-channel type. The former generally composes of bidirectional or unidirectional grading sequences with relatively thick single sand layer, so they are good petroleum reservoirs. Besides, together with deep-water gravity flow deposits and background mudstone, they may be the elements of favorable subtle traps, therefore they should be important oil exploration target in deep-water sedimentary area. The latter develops bidirectional or unidirectional grading sequences displayed by lots of very thin sand-mud rhythmites. Because of very thin single sand layer, they are little significant to oil exploration. Internal wave and internal tide deposits may also build up special positive bed forms on deep-water seafloor, i.e. large-scale sediment waves (including coarse-grained and fine-grained ones) spread widely and internal-tide sand bars that are located in channel-mouth environment. An integrated sedimentation model for internal-wave and internal-tide deposits was established based on researched examples and theoretic distributing environments of sedimentary currents.

Key words

Contourite deposit; Internal-wave deposit; Internal-tide deposit; Classification of sedimentation; Sedimentation model; Petroleum exploration

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Classification of Internal-wave and Internal-tide Deposits in Deep Water and Significance to Petroleum Prospecting[J]. Marine Origin Petroleum Geology. 2007, 12(2): 39-45
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