CONTROL OF PALEOUPLIFTS TO THE MESO-PALEOZOIC PRIMARY OIL AND GAS POOLS IN THE SOUTH OF CHINA

The Leshan Longnusi,Qianzhong and Jiangnan Uplifts mainly controlled the development of the Upper Sinian and the Lower Paleozoic primary oil and gas pools,while the Luzhou and Kaijiang Uplifts and the Late Paleozoic Triassic (isolated) anteclises in Nanpanjiang Shiwandashan area controlled the distribution of the Upper Paleozoic and the Triassic primary oil and gas pools.As the paleouplifts in the south of China have been reconstructed in different degrees,the intact uplifting faces do not exist already.There are few the Meso Paleozoic primary oil and gas pools existing presently in the south of China.The most early primary oil and gas pools in the Sichuan Basin were reconstructed to secondary gas pools,and the primary oil and gas pools in Yangtze and South China areas were mainly destoryed to fossil oil pools.It was suggested that the Meso Paleozoic hydrocarbon exploration in the south of China should mainly consider secondary oil and gas pools and regenerated hydrocarbon pools,that is,the secondary gas pools in the Upper Yangtze area and the regenerated hydrocarbon pools in the Middle Lower Yangtze area.Also,the specific favorable hydrocarbon exploration districts were pointed out,which were confirmed by the discovery of Zhujiadun gasfield in the Yancheng Depression of the North Jiangsu Basin and the West Kaixiantai oil bearing Structure in the South Chenhu area of the Jianghan Basin.