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Discussion of Hydrocarbons Expulsion from Less Mature Source Rocks in the Niuzhuang South Slope of Dongyi Depression, Bohai Bay Basin
Author(s): LI Sumei, PANG Xiongqi, JIN Zhijun, MA Xiaochang, JU Lirong
Pages: 161-
168
Year: 2004
Issue:
1
Journal: ACTA SEDIMENTOLOGICA SINICA
Keyword: 牛庄洼陷; 未熟-低熟烃源岩; 间歇排烃; 混合相; 初次运移;
Abstract: 牛庄洼陷及其南斜坡烃源岩孔隙度、声波时差与伊蒙矿物含量测定结果表明,2 600 m为成岩作用早期与晚期阶段的界限,在早期演化阶段南斜坡没有出现明显的异常压力,牛庄洼陷成岩作用晚期阶段有明显的压力异常.生物标志物演化与Ro值测定反映,该区有机质大量成烃起始阶段为2 700 m,牛庄洼陷南斜坡带<2 700 m烃源岩不具备大量排烃的生烃量条件与地质证据.牛庄洼陷南斜坡八面河油田原油的混合成熟度特征与混合的均一性,反映原油的混合作用在初次运移阶段可能即已发生,推测牛庄洼陷深部烃源岩在异常压力作用下通过微裂隙等间歇式排烃的同时,浅层未熟-低熟烃源岩生成的少量原油经由断层、应力产生的微裂隙与层理面,在地层压力及深部流体过剩压力参与下与成熟油混合幕式排出.烃源岩未熟-低熟阶段的排烃效率低于成熟烃源岩.
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