摘要
部分地球物理工作者对利用地震切片解释古沉积环境技术持有怀疑态度,提出了地震记录是地层波阻抗界面反射叠加的响应结果,直接用于地层沉积环境的解释有违其物理意义,认为只有对地震记录进行反演处理,生成波阻抗数据后,才可用于岩性或沉积环境解释。针对该观点存在的问题依据地震学理论,从三方面进行了辨析:①根据波动理论说明地震切片可用于岩性或沉积环境解释;②澄清薄互层地震响应切片地质意义不明确的疑惑;③切片技术应用的基本条件是要具有区域性的、普遍存在的能量均衡反射同相轴,以此轴为基准,研究其下伏地层的沉积情况。以具体实例展示了利用地震切片技术进行岩性体和古沉积环境解释效果,说明切片技术可以进行岩性体和古沉积环境解释的可行性,并给出了利用地震切片解释沉积环境的思路图。
Since a part of geophysicists take a skeptical attitude to paleo-sedimentary environment interpretation through seismic slicing, the paper considered that the seismic recording is responding results of strata elastic impedance boundary reflective stacking, if directly used in strata sedimentary interpretation will go against its physical sense, only if the seismic records after inversion processing and formed elastic impedance data, then can be used in sedimentary environment interpretation. In allusion to problems existed, discriminating from 3 sides based on seismographic theory： ①seismic slicing can be used in lithologic and/or sedimentary environmental interpretation according to wave theory; ②clarified doubts existed on geological significance of the thin interbeds seismic responding slicing; ③the postulate of slicing application is to have regional, ubiquitous energy-balanced reflected event, take the axis as the reference to study the underlying strata sedimentation. Case studies have revealed effects of lithosome and paleo-sedimentary environment interpretation through seismic slicing, illustrated feasibility and reason of the method.
出处
《中国煤炭地质》
2008年第5期57-60,71,共5页
Coal Geology of China
关键词
波阻抗
水平切片技术
地震记录
古沉积环境
岩性解释
wave impedance
time slice
seismic record
paleo-sedimentary environment
lithologlc interpretation
