中扬子区下三叠统嘉陵江组溶塌角砾岩的形成时期

ON THE STAGE OF KARST - COLLAPSE BRECCIA IN THE JIALINGJIANG FORMATION OF THE LOWER TRIASSIC IN THE MIDDLE YANGTZE AREA

本文根据溶塌角砾岩的物理、化学和生物等特征分析,认为中扬子区嘉陵江组溶塌角砾岩,一般是在印支期和印支—燕山早期形成的,即在中、古生界油气远移、聚集前已形成。因此嘉陵江组溶塌角砾岩是不可忽视的有利储集岩。

Based on the analysis of tee physical, chemical and biological characteristics of breccia, the author suggests that the karst-collapse breccia from the Jialingjiang Formation of the Lower Triassic in the Middle Yangtze Area was developed during the time of Indo - Sinian and Indo - early Yensh-anian, i.e before the time of migration and accumulation of oil and gas. Consequently, the karst - collapse breccia of the Jialingjiang Formation is a favourable reservoir which should not be overlooked.