海洋深水水道地震综合解释技术研究——以南海北部陆坡区更新统深水水道为例

深水沉积是深水油气勘探的重要领域.本文利用南海北部陆坡区三维地震资料,应用三维可视化、相干处理、沿层切片及波形分类等地震技术,识别和刻画南海北部陆坡区更新世深水沉积水道的展布、演化特征及有利砂体分布位置,初步总结出一套适合深水沉积水道的地震识别和描述方法.该水道呈南西-北东方向展布、具蛇曲形态,水道主体以泥岩充填为主,水道侧向加积及堤坝部位是有利的储集部位.

Integrated seismic interpretation of deep water channels in northern slope of the South China Sea

Deep water channels are very important reservoir types in almost all areas where deep water sediments are explored.This paper presents a set of methods that can be used to recognize and characterize deepwater channels based on 3D seismic data on the northern slope of the South China Sea.The depositional processes and lithological characteristics of the deep water channel are also discussed.Recognition and characterization of the deep water channel may provide some insight for future explorations in the South China Sea.The technique of 3D visualization is one of the tools which can help us to look through the whole 3D seismic data,find some interesting targets,such as the deep water channel which is a Pleistocene sinuous channel in the Qiongdongnan basin.Through coherence processing,the clear shape of the channel is presented.Seismic amplitude and wave classification are used to predict sandprone lithology of the deep water channel.The evolutionary processes of the channel are analyzed on four horizon slices.The channel is sinuous and extends in SW-NW direction.There maybe shales in inner parts of the channel,and sands on the lateral aggradations and point bars.