Hydrocarbon accumulation pattern and characteristics of source rocks from other places in Jiangling depression

Exploration practice indicates Jiangling depression is of multi-layers tridimensional oil-bearing characteristic and from oil-source correlation,the source rocks are all from Xingouzui formation in Paleogene system.Through reservoir analysis of source rocks from other places in deep Cretaceous system and shallow Jinsha formation and Qianjiang formation,two hydrocarbon accumulation patterns have been discovered,namely lateral pathway of sand body-sand body and vertical pathway of sand body-fault-sand body.The results indicate the main controlling factors of hydrocarbon accumulation are oil source,faults and reservoirs.Based on hydrocarbon accumulation characteristics of two different types,the favorable exploration area have been pointed out.