distributary
1.The research area is mainly located in a delta plain environment including distributary braided channels, natural levees, flood basins, flatland morasses and distributary beaches.
2.A case study is made for low sinuosity of distributary channel sandbody.
3.Experimental process shows that variance of underwater distributary channel and declining rate of lake plane are closely related to moving intension of motive soleplate.
4.A typical terrigenous lacustrine deltaic distributary channel sandbody is investigated in the outcrop of Pliocene series at Youshashan, west Chaidamu basin, Qinghai province.
5.Comparison between different sedimentary facies of identical depth presents that distributary channel has best physical quality, cch and mouth bar is next to it, and cvs and sch is poorest.
6.Hence,tracing this boundary and searching for the delta distributary channel sands in LST and TST will be the key for petroleum exploration in this area.
7.Mainly consisting of sandstones and pebbled sandstones with minor siltstone and mudstone partings, the lower Lower Jurassic Abe Formation in Kuche depression is subaqueous distributary channel deposit of braided delta.
8.In a way, the evolution to upward of distributary channel microlithofacies in shelf delta plain of Later Carboniferous Epoch in this area is repeatedly and rapidly, and every time is a normal grading change from coarse to thin, at last it evolve into marshy deposit.
9.By analyzing cores, logging data and drawingsandstone/strata contour, it was deduced that sediment of Bashijiqikeian mainly developedbraided delta front underwater distributary channel and river mouth bar microfacies, andKumugliemuian developed marine invasion facies, including lagoon, littoral deposit andbraided delta facies.
10.The treatment of ANN lithofacies shows that typical delta facies include distal bar,mouth bar,subaqueous distributary channel,interdistributary estuary in delta front,delta plain branch channel and inter branch channel in ascending order.
