| 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 explo-ration. 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 inter-nal-tide sand bars that are located in channel-mouth environment. An integrated sedimentation model for internalwave and internal-tide deposits was established based on researched examples and theoretic distributing environ-ments of sedimentary currents. |
