饶阳凹陷马西地区近岸水下扇沉积特征及含油性

Sedimentary characteristics and oil-bearing feature of nearshore subaqueous fan at Maxi area,Raoyang depression

根据饶阳凹陷马西地区构造活动的演化阶段以及地震、测井、岩相、粒度等资料分析,认为该区发育近岸水下扇沉积,可划分为扇根、扇中和扇端等亚相及若干微相。影响其形成和分布的主要因素有:同生断裂的活动形成了陡坡地形,幕式活动构成触发机制,发育阵发性水下扇;气候因素和物源因素也影响其发育;基准面升降影响其相序特征,在本区,主要发育向上变细的正旋回相序。针对马西地区近岸水下扇发育的特点,建立了该区的发育模式。分析了其含油性,扇中水道微相储层物性最好,是下步勘探的有利目标。

Study on nearshore subaqueous fan at Maxi area of Raoyang depression is based on a comprehensive study of seismic data,well logging data,lithologic data and the evolvement process of tectonic movement in Raoyang sag.It can be classified into three subfacies:proximal fan,middle fan and distal fan,and several microfacies.Several factors control the formation and distribution.The primary factor is the movement of contemporary fault which brings about steep landform and its episode movements make up of the burst mechanics. Meanwhile,the climate and the provenance factor can also affect its emergence.The base level affects the features of facies orders.At the area,the mainly facies orders is the fining-upward cycle.According to the characteristics, the development model is established at Maxi area. Through the analysis of oil-bearing,the physical property of middle fan channel is more favorable.The future exploration direction of maxi area is proposed.