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柴达木盆地西部第三系蒸发岩与生油岩共生沉积作用研究
引用本文:金强,查明.柴达木盆地西部第三系蒸发岩与生油岩共生沉积作用研究[J].地质科学,2000,35(4):465-473.
作者姓名:金强  查明
作者单位:石油大学(华东), 山东东营, 257062
基金项目:“石油创新基金”项目的资助
摘    要:许多人认为柴达木盆地第三纪盐湖环境不利于形成有机质丰度高的优质生油岩.作者通过柴达木盆地西部下干柴沟组、上干柴沟组(E3和N1)蒸发岩沉积成因和生油岩有机质富集状态的研究,发现优质生油岩(TOC>1%,干酪根类型为Ⅰ型或Ⅱ1型)恰好发育在石膏、芒硝和岩盐最发育的构造部位和层位,提出了一种"大咸盆套小盐湖"的蒸发岩与生油岩共生的沉积模式,认为第三纪盐湖的水体深浅既控制了蒸发岩沉积和分布,又控制了一般生油岩和优质生油岩的形成,就该盐湖有机质分布规律进行了理论解释.

关 键 词:蒸发岩  生油岩  沉积模式  第三系  柴达木盆地
收稿时间:1999-09-29
修稿时间:1999年9月29日

CO-SEDIMENTATION OF TERTIARY EVAPORITES AND OIL SOURCE ROCKS IN THE WESTERN QAIDAM BASIN
Jin Qiang,Zha Ming.CO-SEDIMENTATION OF TERTIARY EVAPORITES AND OIL SOURCE ROCKS IN THE WESTERN QAIDAM BASIN[J].Chinese Journal of Geology,2000,35(4):465-473.
Authors:Jin Qiang  Zha Ming
Institution:University of Petroleum, Dongying, Shandong 257062
Abstract:It was believed that there were not prospective oil source rocks (with high organic carbon contents and better hydrocarbon potentials) deposited in the evaporite lacustrine of the Qaidam basin in Tertiary. Based on the investigations of co-sedimentation of the evaporites and source rocks in age of Oligocene and Miocene in the western Qaidam basin, the authors represented that the prospective oil source rocks were just distributed stratigraphically and tectonically in the locations where halite and gypsum were deposited. A genetic model was postulated for evaporites and source rocks, which was described as “big shallow-water saline lake surrounding small deep-water brine lake”. The authors believed that water depth controlled both on deposition of the evaporites and the accumulation of organic matter in the salt-lake environment. And a theoretical model for forming of oil source rocks in the salt environment was presented in this paper, which was a useful tool for finding prospective source rocks in the Qaidam basin.
Keywords:Evaporite  Oil source rocks  Depositional model  Tertiary  The Qaidam baX  
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