高密度海底电缆地震资料后SED评估分析——以渤海X油田为例

Post-SED evaluation analysis of high density submarine cable seismic data——Take Bohai oilfield X as an example

高密度海底电缆地震资料具有面元小,覆盖次数高,采集时间长,成本高等特点,为探究不同深度目的层选择合适的采集参数这一难题,以渤海X油田高密度海缆地震资料为例,从定性和定量两方面进行后SED(survey evaluate design)评估分析,首先分别从叠加剖面、自相关、道集、切片、相干体五方面开展定性评估,然后从分辨率(垂直分辨率、水平分辨率)和理论模型分析开展定量评估,分析认为,针对地震资料所用的采集设备而言,面向开发时0 s~2 s时间段可选择面元12.5 m×12.5 m,若0 s~1 s内面元可以更小,2 s以下可选择面元12.5 m×25 m。研究成果为其他海上区块的地震资料采集设计提供借鉴。

High-density submarine cable seismic data has the characteristics of small panel,high coverage times,long acquisition time,high cost,etc.In order to explore the problem of how to select appropriate acquisition parameters for different depth target layers,we take the high-density submarine cable seismic data of Bohai X Oilfield as an example in this paper,and carry out post-SED(survey evaluate design)evaluation analysis from both qualitative and quantitative aspects.Firstly,qualitative evaluation is carried out from the five aspects of superposition profile,autocorrelation,trace set,slice and coherence volume.And then quantitative evaluation is conducted from the resolution(vertical resolution and horizontal resolution)and theoretical model analysis.The analyzed results shows that for the acquisition equipment used for seismic data in this paper,the panel 12.5m×12.5m can be selected for the 0-2S period of development.If the panel in 0-1s could be smaller,the panel 12.5m×25m can be selected below 2S.The research results provide theoretical and technical basis for seismic data acquisition design of other offshore blocks.