凹陷缓坡带沟谷分析及其对油气成藏的影响

 位于生油凹陷邻近的凹陷缓坡带通常是地层及岩性油藏发育的有利区带。在缓坡带上所发育的多种油藏大都与缓坡带的沟谷存在着密切的关系。精确的古沟谷分析可以减少根据地震相预测沉积体系的多解性，降低储集层预测的风险。进一步结合层序地层学的认识对缓坡带沟谷中沉积特征进行分析，总结出洼陷缓坡带沟谷中不同沉积体系域下有利储层发育特点以及沟谷中不同沉积环境下所产生的不同油气疏导效能，可对凹陷缓坡带受沟谷发育影响的地层、岩性油藏勘探有一定指导意义。

Analysis of valley on gently-dipping slope of sag and affect on hydrocarbon reservoir

The gentle slope of sag near the source sag is generally the prospective zone of development of lithologic reservoir. The various reservoirs developed on the gentle slope are mostly closely relative to valley on the gently-dipping slope. The superior analysis of palaeovalley can diminish the multiple solutions from predicting sedimentary system by seismic facies and reduce reservoir-predicting risk. Combination with the knowledge of sequence stratigraphy, we further analyzed the sedimentary feature of valley on the gentle slope, summed up development feature of prospective reservoir in different sedimentary system on the valley of gentle slope of sag and different hydrocarbon migration effect produced in different sedimentary environment of valley, which has guide meaning for the exploration of stratigraphic and lithologic reservoirs affected by valley development on gentle slope of sag.