Mechanisms for the Accumulation of Organic Matter in Sediments of the Middle Permian around Bogda Mountain, Southern Junggar Basin, NW China

The organic-rich shales and mudstones of the Middle Permian are most important unconventional petroleum targets in southern Junggar Basin northwestern China. Although numerous studies have been vigorously conducted on paleoenvironment reconstructions, organic matter enrichment mechanism is still controversial due to utilization problematic geochemical proxies established early studies. In this study, major trace elemental compositions, molecular markers, stable carbon isotopic petrology were used study multiple factors affecting accumulation sediments. According results, a relatively hydrostatic, brackish, anoxic environment proposed northern periphery Bogda Mountain, where original structure could be preserved with non-correlations between productivity (P Ba) TOC. western area, sediments deposited under suboxic conditions, frequent fluctuation occurring top bottom water columns. was result blooms rapid sedimentation. This improved around Mountain can contribute evaluations potential distinguishing characteristics different models.