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地质学报  2004 

柴达木盆地尕斯库勒油田原油油源特征及成藏分析

, PP. 253-262

Keywords: 原油,运移,成藏,含氮化合物,生物标志物,尕斯库勒油田,柴达木盆地

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Abstract:

在系统剖析尕斯库勒油田浅层(N_1-N_2~1)和深层(E_3~1)油藏原油的地球化学特征,精细划分原油类型基础上,用中性氮化合物作为原油运移的示踪性指标,追溯油藏原油的运移方向和路径;并利用含油包裹体测温资料,结合地层沉降热演化史,确定原油成藏期。研究结果表明,尕斯库勒浅层与深层油藏原油地球化学特征有明显差别,分别来自不同的油源;在浅层和深层油藏内部原油也并非来自单一油源。运移参数显示,尕斯库勒浅层油藏原油来自茫崖凹陷,沿油砂山大逆断层从构造东侧注入油藏。深层油藏有两个原油注入点,一是来自茫崖凹陷的原油从东北方向沿油藏北端的Ⅺ号断层注入,由北往南运移;二是从构造西侧的Ⅲ号断层注入。尕斯库勒浅层油藏原油在约9Ma前开始注入成藏,延续至今;深层油藏原油成藏期较早,为前29.5~3Ma。

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