辽东湾蠕虫状地震反射的地质意义研究

Research on geological significance of vermicular reflection in Liaodong Bay

(1.中国石油大学(北京),北京102249;2.中海石油(中国)有限公司天津分公司,天津300452;3.长江大学,湖北荆州434023)

China University of Petroleum (Beijing),Beijing 102249,China

常规统计岩石物理学研究缺乏对地质成因的分析及对地震反射特征的物理机理分析,难以建立合理的岩石物理模板,指导地震属性的分析与解释。针对这些问题,基于地震岩石学研究与宏观沉积相相结合的原则,首先将辽东湾东营组蠕虫状反射按宏观沉积环境分为滑塌型、复合型和远岸型;然后结合沉积过程,将蠕虫状反射形态和沉积微相结合起来,分析蠕虫状反射形态与物源方向的关联性;最后总结出蠕虫状反射的地质意义及不同形态蠕虫状反射形成的物理机理。建立了富泥型和富砂型蠕虫状反射的识别模式,为蠕虫状反射的沉积研究、内幕刻画和储层预测打下了基础。

It is difficult to establish appropriate rock physics template to guide the analysis and interpretation of seismic attributes by conventional statistical petrophysics for the lack of analysis on geologic origin and physical mechanisms of seismic reflection.Aiming at the problems,we combine seismic petrology and macro sedimentary facies.Firstly,the vermicular reflection was divided into slumping type,compound type and far off-bank type according to the macro depositional environment.Then,based on the deposition process,the vermicular reflection shape was combined with its sedimentary micro-facies to analyze the association between the vermicular reflection shape and source direction.Finally,the geological significance of vermicular reflection and physical mechanism of different vermicular reflection were summarized,and the identification pattern of mud-enriched and sand-enriched vermicular reflection was established,which lays foundation for sedimentary research,inner depiction and reservoir prediction.