INTERRELATION BETWEEN MESOZOIC RESIDUAL BASINS IN THE SOUTHEASTERN PERIPHERY OF SONGLIAO BASIN AND OIL-GAS EXPLORATION PROSPECT

In recent years, good oil-gas indications have been found in the Mesozoic residual basins in the southeastern periphery of Songliao Basin, making a breakthrough in industrial oil-gas flow wells. However, the weak research on interrelation between basins and hydrocarbon accumulation characteristics restricts the deployment of oil-gas exploration engineering and prediction of resources prospect. Therefore, based on the oil-gas exploration engineering survey, through systematic field geological survey and test analysis, it is concluded that the Mesozoic residual basins are all independent fault basins, with medium-good source rocks developed in the Lower Cretaceous Xiahuapidianzi Formation and Hengtongshan Formation, forming good source-reservoir-cap assemblages of self generation-self storage, lower generation-upper storage, and upper generation-ower storage, with a certain oil-gas exploration prospect. The subtle lithologic oil-gas reservoir and diapiric-structure reservoir are favorable exploration direction.