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地质学报  2007 

东营凹陷牛庄-六户洼陷沙河街组三段下亚段烃源岩排烃通道及证据

Keywords: 初次运移,裂缝,干酪根有机网络,QGF-E,X-CT

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Abstract:

通过岩心和薄片镜下观测、包裹体荧光分析、扫描电镜、QGF-E和X-CT等技术对东营凹陷牛庄―六户洼陷沙河街组下亚段(简称沙三下)烃源岩的排烃通道进行了判识,结果表明:①源岩内部的裂缝(包括沿层理面的顺层裂缝、与层理面斜交的裂缝和成岩收缩缝)多被固体沥青所充填,且充填裂缝的方解石脉体中存在大量发亮黄色荧光的油包裹体,说明裂缝充当了源岩排烃的有效通道;②牛24、牛83等4口井的73块与烃源岩互层的薄层砂岩样品的QGF-E荧光强度值绝大多数大于120pc(约占分析样品总数的78.6%),仅少数样品的荧光强度小于40pc,说明大多数薄层砂岩充当了源岩内部烃类侧向排出的通道;③扫描电镜和高分辨率X-CT扫描结果显示,Es3下烃源岩样品中干酪根网络分布连续,按照Hunt(1967)确定的有机质中烃类含量的下限标准(2.5%~10%),高有机质丰度和转化率的Es3下烃源岩存在通过干酪根网络的排烃机制。

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