现代地质2012，Vol.26Issue(1)：10-21,12.
北羌塘盆地索瓦组上段的时代、古气候及石油地质特征
Geological Age, Paleoclimate and Petroleum Geological Characteristics of the Upper Part of the Suowa Formation in the North Qiangtang Basin
摘要
Abstract
The upper part of the Suowa Formation in the central district of the North Qiangtang depression is the sediment during the late-stage evolution of the Qiangtang basin, which deposits in tidal flat-lagoonal environment. By strata correlation of the upper part of the Suowa Formation, it is found that its lithology is different in the eastern, western and southern areas, and the places where the oil shale exposed only aligned around the epi-continental restricted gulf-lagoon areas (e. G. Shengli River area, Changshe Mountain area and Tuolamu area) in the southern margins of the North Qiangtang basin. The deposition of the oil shale is obviously controlled by differential palaeotopography. Based on the fossil assemblages in the upper part of the Suowa Formation and its underlying strata, and combined with the Re-Os dating of the Shengli River oil shale, the geological age of the upper part of the Suowa Formation is suggested to be Early Cretaceous. The Cretaceous spores and pollen assemblages and silicified wood reveal that the climate during the early period of the upper part of the Suowa Formation was warm and humid, while the climate during the later period was hot and arid. Furthermore, the vertical changed climate may be not restricted to the Shengli River region, but the whole North Qiangtang basin. The discovery of the oil shale-gypsum sedimentary associations is of important implications for our knowledge of the hydrocarbon accumulation and preservation of the Qiangtang basin during the late stage evolution.关键词
地质时代/古气候/孢粉组合/索瓦组上段/早白垩世/羌塘盆地Key words
geological age/ palaeoclimate/ palynological assemblage/ the upper part of the Suowa Formation/ Early Cretaceous/ Qiangtang basin分类
天文与地球科学引用本文复制引用
曾胜强,王剑,陈明,付修根,吴滔,熊兴国..北羌塘盆地索瓦组上段的时代、古气候及石油地质特征[J].现代地质,2012,26(1):10-21,12.基金项目
国家油气专项"青藏高原重点盆地油气资源战略选区调查与选区"项目(XQ-2009-01) （XQ-2009-01）
国家自然科学基金项目(40972087,41172098) （40972087,41172098）
四川省青年科技基金项目(09ZQ026-006). （09ZQ026-006）
