EVALUATION ON THE GEOLOGIC CONDITIONS OF THE LOWER PALEOZOIC HYDROCARBON IN LOWER YANGTZE AREA

The Lower Paleozoic in Lower Yangtze area which has developed hydrocarbon source rocks,organic matter with high thermal evolutionary degree and good reservoir-cap conditions possesses favorable geologic conditions to form large scale natural gas pools.The Indosinian movement greatly reformed the tectonics of the Lower Yangtze sea basin sedimentary body,and has some degree of katogene on oil and gas pools.But the Lower Paleozoic oil and gas pools have advantageous preservation conditions because of the sealing and covering of very thick mudstone in the Gaojiabian Formation of the Lower Silurian.Therefore,as for the evaluation of hydrocarbon exploration domain,the Lower Paleozoic is obviously superior to the Upper Paleozoic and the marine Paleozoic.