摘要
深水硅质碎屑岩沉积远离陆架区域,具有远源异地特征,水深大,钻井露头资料少.目前深水储层和油气的预测多以高分辨率三维地震处理和解释技术作为主要的研究手段.本文以孟加拉湾盆地北部深水区新近纪深水沉积体为例,通过高分辨三维地震资料的处理和解释,基于深水沉积体的几何外形特征和储层与围岩的阻抗差异,以地震相分析为基础,采用相干体、频谱分解数据、甜点属性体的地层切片等地震沉积学方法,对研究区内深水沉积体开展了精细的刻画,识别出了水下扇、水道复合体、天然堤-溢岸沉积、块状搬运沉积体等4种深水沉积单元,并对水下扇体和水道复合体中的砂岩储层分布进行了定量预测.
Deepwater siliciclastic depositional reservoirs are far away from the continental shelf, which cannot be easily observed and studied in the modern environment, with few wells and outcrops data. High resolution seismic processing and interpretation techniques is the main tools for identifying and predicting the deepwater reservoirs. Based on the 3d marine seismic data and seismic sedimentology methods, the Neogene deepwater deposits and reservoirs was studied in the north area of Bengal basin. Four types of deepwater depositional elements was identified by analyzing the seismic reflection characteristics, such as deepwater fan, channels, levee-overbanks deposits and Mass-transport complex. Several seismic sedimentary methods was proved effective in different deepwater elements research. The strata slices of seismic coherence cube was used to track the multi-scale deepwater channels, and the strata slices of spectral decomposition data was used to describe the reservoir characters of the deepwater fan systerm. The sweetness attributes and its strata slices was used to delineate the internal reservoir architecture and distribution of the deepwater channel complex. This study reveals that the main types of reservoir come from the deepwater fan and the large scale channel in the northeast area of Bengal basin.
出处
《地球物理学进展》
CSCD
北大核心
2013年第5期2626-2633,共8页
Progress in Geophysics
基金
国家重大科技专项(2008ZX05029-003)资助
关键词
深水沉积
水道
水下扇
储层
地震沉积学
甜点属性
deepwater deposition, channel, deepwater fan, reservoir prediction, seismic sedimentology, sweetness
