薄储层叠后反演影响因素分析与地震属性解释研究

Analysis on affecting factors of post-stack inversion and seismic attribute interpretation of thin reservoir

薄储层是岩性地震勘探的主要研究对象和难点之一,而地震反演被普遍认为是解决此类地震勘探问题的主要解释技术与方法。尽管现今的反演技术已经从叠后发展到叠前,从AVO反演发展为弹性反演,但反演技术仍面临着地震采集、处理和解释等方面诸多因素的影响以及认识上和观念上存在的一些问题的影响,这些影响很多时候会导致反演的地质解释结果与钻井结果相差甚远。为此,在不考虑叠前地震影响因素,和在理想的成像条件下,基于薄储层褶积模型对叠后反演面临的主要影响因素进行了讨论与分析。在此基础上,对叠后反演与地震属性的理论关系和地质解释关系进行了讨论,同时给出了叠后反演应考虑的主要步骤。

Thin reservoir is the main research object and one of the diffi- culties in lithologic seismic exploration while the seismic inversion is commonly regarded as an important interpretation technology and method for solving this problem.Having been developed from post-stack inversion to pre-stack inversion,from AVO inversion to elastic inversion,the current inversion technology is still impacted by many factors in seismic acquisition,processing,and interpreta- tion.Moreover,some differences in understanding and ideas also af- fect the inversion technology,resulting in a big difference between geologic interpretation results of inversion and that of drilling. Therefore,without considering the pre-stack seismic affecting fac- tors,the main factors affecting post-stack inversion was discussed and analyzed base on the convolution model of thin reservoir under the ideal imaging conditions.After the analysis,the theoretical rela- tion and geologic interpretation relation of post stack inversion and seismic attribute was probed,and main steps of post-stack inversion were proposed.