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

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.