辽河断陷西部凹陷中段古潜山地质时代新认识及其地质意义

通过多门类微体古生物手段结合岩石地层学、同位素地层学以及地球物理测井等资科,重新确定研究区内古潜山顶层地质时代主要为中晚寒武世至早奥陶世,中、新元古代地层在古潜山顶面仅局部出露。这一成果改变了30多年以来对该地区古潜山地质时代全部归属中新元古代的传统认识,为重新建立本研究区地层序列、认识本研究区古潜山内幕构造特征、储层分布特征和岩相古地理特征提供了宝贵的依据。

New recognition of geologic age of the middle section of the buried hill in the western depression of Liaohe fault depression and its geologic implication

This study uses multi-type micropaleontology, petrostratigraphy, isotope stratigraphy and geophysical logging data to re-recognize the geologic age on the top of the buried hill in the study area to be mid-late Cambrian to early Ordovician, while Mesoprotozoic and Neoprotozoic only locally appear in the top of the buried hill. This has changed the traditional understanding in the past 30 years that the buried hill in this area totally belonged to Mesoprotozoic and Neoprotozoic, and has provided valuable proof for re-establishing stratigraphic sequence, understanding inner buried hill structure, reservoir distribution and lithofacies palaeogeography.