地球学报2025，Vol.46Issue(3)：623-636,14.DOI:10.3975/cagsb.2024.111301
侏罗纪全球古海洋演变历程及其对西藏羌塘盆地油气勘探的启示
Historical Evolution of Jurassic Paleo-ocean as a Reference for Petroleum Exploration of the Qiangtang Basin in Tibetan Plateau
摘要
Abstract
The Qiangtang Basin,located in the Tibetan Tethys domain of China,represents a significant target for petroleum exploration.Recent discoveries have revealed the presence of high-quality source rocks,characterized by oil shales and dolomite reservoirs within carbonate platform facies,in the Jurassic strata of this area.This paper aims to analyze the mechanism of organic matter enrichment and sedimentary models of carbonate platforms during the Jurassic period by drawing upon the latest advancements in global Jurassic paleo-oceanography and paleo-climatology research.The analysis is conducted from the perspective of global sea level fluctuations,changes in paleo-ocean temperatures,and positive and negative carbon isotope excursions.The objective is to provide valuable insights for predicting hydrocarbon-generating basins and delineating favorable exploration blocks within the Qiangtang Basin in the Tibetan plateau.The results demonstrate that the negative and positive carbon isotope excursions recorded in the organic matter of the Bilongco and Xichangliang oil shales in the Qiangtang Basin can be compared on a global scale.It is hypothesized that the Early and Late Jurassic periods were characterized by massive enrichment of organic matter in the Paleocean.These periods are considered target stratigraphies for the exploration of regionally distributed,high-quality hydrocarbon source rocks.The Middle Jurassic Buchu Formation and the Upper Jurassic Sowa Formation developed two sets of carbonate sedimentary strata,which were deposited during the global sea-level lowstand and highstand,respectively.These strata correspond to the"coolhouse"and"hothouse"climate system states,as indicated by the sea surface temperatures.It is suggested that cold-water carbonates and warm-water carbonate models should be utilized to predict reservoir distribution zones,respectively.关键词
侏罗纪/古海洋/海平面/海洋温度/碳同位素/油气勘探/羌塘盆地Key words
Jurassic/ancient ocean/sea level/ocean temperature/carbon isotope/oil and gas exploration/Qiangtang Basin分类
天文与地球科学引用本文复制引用
伊海生..侏罗纪全球古海洋演变历程及其对西藏羌塘盆地油气勘探的启示[J].地球学报,2025,46(3):623-636,14.基金项目
本文由国家自然科学基金项目(编号:42172121)资助. This study was supported by National Natural Science Foundation of China(No.42172121). （编号:42172121）
