The oil and gas migration in the Baise Basin, Guangxi

The Baise Basin is a Tertiary residual basin grounded upon the folded basement of the Nanpanjiang Early Mesozoic depression in Guangxi. Two groups of faults developed mostly during the deposition of the Lower Tertiary strata have provided the major channels for the vertical and lateral migration and accumulation of oil and gas from the central and deeper parts of the basin. The oil pools are distributed mainly in the Tiandong depression in the eastern part of the basin. There is a general trend of oil and gas migration from the higher pore fluid pressure and higher residual pore fluid pressure areas to the lower ones. The favourable zones for oil and gas migration include the central faulted swales of the Tiandong depression, Zisang-Liuchou-Nayanggou fan systems and Nabi swells in the northern steep slope zone, central faulted swales of the western depression, southern slope zone of the Tiandong depression, and central faulted swales of the Toutang depression.