On the basis of core observation,logging data,heavy mineral analysis and seismic data,the provenance direction,sedimentary facies and models of the Xishanyao Formation in Malang Depression of the Santanghu Basin have been reseached. The research suggests that there are braided river delta facies and lacustrine facies. In the early sedimentary time of the Xishanyao Formation,the braided river delta widely distributed in the north of the lake. The underwater distributary channel sandbodies and the mouth bar sandbodies,distributing in the braided river delta front,are the main reservoir. In the late sedimentary time of Xishanyao Formation,the lacustrine facies was the main facies type in Malang Depression.The small-scale braided river delta and the beach bar also distributed in this period. There is a transgression process in the Xishanyao Formation period. According to the test analysis data,the lithic sandstone and the feldspathic lithic sandstone are the main sandstone types in the Xishanyao Formation. The cementation of sandstone is not strong. The compaction is the main factor of decreasing porosity. The intergranular dissolution pore and the residual intergranular pore are the main effective reservoir space. The reservior quality is greatly influenced by sedimentary microfacies. The sandstone of the Xishanyao Formation belongs to low porosity and low permeability reservoir,and it is the effective oil and gas reservoir.
Si Xueqiang,Guo Mozhen,Yang zhili et al. Sedimentary characteristics and models of the Jurassic Xishanyao Formation in Malang Depression,Santanghu Basin, Xinjiang[J]. JOPC, 2015, 17(4): 553-564.
