Clastic, chemical and mixed sedimentary rocks coexist in saline lacustrine lake, but the mechanism that multiple type of sediments were distributed in order was not clear yet. Taking the upper part of 4th member of Shahejie formation（Be called Es4s for short）in Bonan sag as a case study, the sediments distribution characterization and its control factors in saline lacustrine lake were concerned. Results show that the low stand system tract of Es4s mainly develop clastic in Bonan sag. And chemical and mixed sedimentary rocks were developed in transgressive and highstand system tract. Fans, sandy beach-bar, mixosedimentite beach-bar, carbonate beach-bar, salt lacustrine, semi-deep and deep lacustrine were distributed orderly from nearshore to far-shore. Distribution of chemical rocks was controlled by water environment. And paleosalinity super than 10‰ was the basis of chemical rocks formation. The carbonate rocks, gypsum rocks, salt rocks were controlled by water salinity and depth. Moreover, water depth had effect on distribution of different types of carbonate rock and clastic rock. Distribution of classic rocks was mainly controlled by provenance and paleogeomorphology. The position and supply intensity of provenance determined sedimentation position and size of classic rocks, meanwhile development of paleocarbonate rocks influenced the development position of current carbonate rocks. Height and slope of paleogeomorphology determined sand body types and it also influenced formation of biogenetic-reef and chemical origin carbonate rocks. Ordered distribution of multiple type of sedimentary facies were benefited from the combined action of palaeowater depth, palaeosalinity, palaeoprovenance and palaeogeomorphology.
Li Shengyu Tian Jingchun Liu Peng Lin Xiaobing. Control factors and Ordered distribution of sediments in saline lacustrine lake: A case from the upper part of 4th member of Shahejie Formation in Bonan sag[J]. Chinese Journal of Geology, 2018, 53(1): 327-340.