Mechanism analysis on sedimentary facies and fluid potential controlling pool forming in Dongying Depression and its application speculation

According to theory of sedimentary facies zone and fluid potential controlling pool forming established in stratigraphic reservoir exploration in low-lying belt of Dongying Depression, and combined with literature at home and abroad, mechanism of sedimentary facies and fluid potential controlling pool forming were aralyzed. Taking the glutenite body in abrupt slope belt of Dongying Depression as an example, the paper studied coupling effect of "facies-potential" upon reservoir forming. Result showed that reservoir forming process in glutenite body in north belt of Dongying Depression were controlled by coupling of "facies-potential". Characteristics of sedimentary facies and fluid potential were summarized, and the theory was developed and perfected accordingly. Study approved that reservoir forming is a dynamic process, coupling effect of favorable sedimentary facies and potential is the key factor, and evolution of reservoir property and formation pressure also have important influences upon fullness degree of an oil bearing trap. As a result, study should be carried out on distribution and dynamic evolution of reservoir property and formation pressure at and after critical period, so as to realize unification of tectonic evolution history, burial history, thermal history, hydrocarbon generation history, oil-gas incharge history and history of sedimentary facies and fluid potential controlling pool forming. This will further complement and develop the theory, and arose new break through in theory of petroleum exploration in continental faulted basin.