摘要
运用地震沉积学基本原理,借助高分辨率三维地震数据体,综合使用三维可视化、相干体解释、地层切片技术、地震分频与RGB混频等技术手段对哈拉哈塘地区某三维地震区的古河道进行识别和刻画。精细刻画出志留系底界面与奥陶系吐木休克组底界面2个重要沉积间断期发育的河道体系并总结其特征。研究结果表明:志留系底界面发育高曲度的稳定曲流河,而吐木休克组底界面发育典型的曲流河。两期河道发育期哈拉哈塘地区均处于相对平缓的地貌背景。通过古河道的识别可知:在吐木休克组沉积前该区域曾发生短暂暴露性沉积间断而非传统认识的直接发育的淹没台地型水下沉积间断,从而为吐木休克组底界面下发育的古岩溶储层提供更合理的成因背景解释。
According to the basic principle of seismic sedimentology,using high-resolution 3D seismic,comprehensively applying 3D visualization,coherence cube interpreting,stratigraphical slicing method,seismic frequency-decomposition and RGB frequency mixing,paleo-channels in Halahatang area were recognized.Characteristics of paleo-channels on the bottom of Silurian and Tumuxiuke formation of Ordovician were depicted.The results show that paleo-channels on the bottom of Silurian belong to stable meandering and ones in Tumuxiuke formation belong to meandering.Furthermore,they are both developed on the background of relatively gentle geomorphology.It is very important to recognize rivers developed on the bottom of Tumuxiuke formation.However,this sequence surface is exposure deposional break hiatus instead of subfluvial depositional break hiatus.So reasonable apprehension for karst reservoir developed below Tumuxiuke formation can be given.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第12期3804-3810,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(2007CB209502)
国家重大专项基金资助项目(2011ZX05004)
关键词
哈拉哈塘
地震沉积学
地震分频
RGB地震混频
沉积间断
Halahatang area
seismic sedimentology
seismic frequency-decomposition
RGB frequency mixing
depositional break hiatus
