利用地层切片研究陆相湖盆深水滑塌浊积扇沉积特征
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摘要
以泌阳凹陷核三段上部层序为例,首先建立高分辨层序格架,然后以地震沉积学思想为指导,利用地层切片技术,制作了展现沉积微相分布和沉积演化过程的切片数据体。通过岩心、录井、测井等资料的标定,对典型地层切片进行了精细解释。研究认为,泌阳凹陷深凹区主要接受东北部、东南部和西南部三大剥蚀区的陆源碎屑供给,对应发育东北部侯庄辫状河三角洲、东南部梨树凹近岸水下扇和西南部杨桥近岸水下扇沉积体系,而深凹区内多发育滑塌浊积扇沉积。地震剖面显示透镜状地震反射与前积地震反射共生,通过对连续地层切片的比较研究,刻画出辫状河三角洲与滑塌浊积扇的成因关系。最终预测了各类沉积相在时空上的展布和演变,为该凹陷寻找滑塌浊积扇等隐蔽油气藏提供了较为可靠的依据,研究成果在2010年8月完钻的安深1井得到了证实。
The upper He-3sequence of the Biyang Sag is used in this paper as an example to illustrate the workflow of Seismic Sedimentology.On the basis of subtle sequence framework,a stratal slice cube was made which displayed the distribution of sedimentary microfacies,and the analysis of the cube enabled the interpretation of the evolutionary history.Through the comprehensive analysis of core,lithology and welllogging,the sandbodies of the typical slices were interpreted elaborately,and some conclusions were drawn as follows.There exist three denuded areas in the north-east,south-east and south-west,respectively,which provided the terrigenous clasts to the deep depression of the Biyang Sag,and where developed correspondingly the three sedimentary formations,i.e.,the Houzhuang braided delta in the north-east,the Lishuwa nearshore subaqueous fan in the south-east and the Yangqiao nearshore subaqueous fan in the south-west.In the deep depression,slump turbidite fans were developed.The progradational configuration of braided delta front always associated with the lenticular reflection in strike direction,which showed the process of the sand bodies sliding from delta front into semideep to deep lacus and being wrapped by mudstone.Finally,the paper predicts the distribution of sedimentary facies and provides the reliable evidence of exploration of subtle traps such as slump turbidite fans.The result was verified by Well Anshen 1.
引文
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