【摘要】 酒泉盆地酒西坳陷原油地球化学性质很相似,而烃源岩的性质较复杂。选择干酪根碳同位素、Pr/Ph和生物标志化合物比值等参数计算下白垩统3套烃源岩之间的相关系数,通过聚类分析,将下白垩统烃源岩分为6类,下沟组下段和赤金堡组上段烃源岩的相关性很好,而中沟组、下沟组上段和赤金堡组下段的烃源岩差异较大。根据6类烃源岩的热成熟度、碳同位素类型和生物标志化合物参数进行油源对比,确定酒西坳陷主要烃源岩是下沟组下段和赤金堡组上段有机质类型相对较好的湖相泥岩和泥灰岩。图4表2参10更多还原

【Abstract】 The Lower Cretaceous lacustrine mudstone and marl （K₁c, K₁g, K₁z） in the Jiuxi Depression have long been recognized as the source rock for hundreds of millions tons oil in place. Biomarker and carbon isotopic composition indicate that the oils are quite similar geochemically but the geochemical characteristics of source rocks have differente evident though all source rock share some common characteristics of lacustrine depositional environment. Kerogen carbon isotopic composition, Pr/Ph and biomarker are the key indicators to genetically separate the source rock samples into six groups. The source rocks of the lower part of Xiagou Formation （K₁g） have good relationship with that of the upper part of Chijinpu Formation （K₁c）, while the rest of the source rocks have obvious differences revealing a strong heterogeneity. Based on the detailed oil-source correlation,including the thermal maturity, carbon isotopic compositions and biomarker, Group Ⅴand Ⅵ source rocks should be the main contributors of the crude oils.更多还原