Marine Oil Shale Depositional Environment of Qiangtang Basin in Northern Tibet

Abstract

Abstract: Two marine oil shale sections including Shenglihe and Biluocuo in Qiangtang basin, northern Tibet, are investigated in details. On the basis of isotope Sr variation, integrated with lithologic association, authigenic mineral assemblage, sedimentary structure and paleontologic evidence, the Shenglihe oil shale is classified into two major sedimentary environments such as tidal flat one and lagoon one. The intermittent occurrences of these two environmental deposits resulted in main forming condition of the Shenglihe oil shale, and so did the Biluocuo oil shale. The deposition of oil shale is not only associated with sea-level rise or fall and lagoon's intermittent opening, but also influenced by paleoclimate. The paleoclimate is the essential reason for formation and disappearance of the oil shale. Damp and hot climate is favorable for the formation of it, and droughty and scorching climate may restrict propagation of organisms, thus making a disappearance of it.

Key words: Qiangtang basin, marine deposit, oil shale, depositional environment

CLC Number:

TE112.116

FU Xiu-gen, WANG Jian, WANG Zheng-jiang, CHEN Wen-xi. Marine Oil Shale Depositional Environment of Qiangtang Basin in Northern Tibet[J]. Xinjiang Petroleum Geology, 2007, 28(5): 529-533.

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