The controls on the lithologic oil pools and models for hydrocarbon accumulation in the Dongying depression,Shandong

The controls on the lithologic oil pools and model for hydrocarbon accumulation in the Dongying depression are explored on the basis of statistical analysis of the oil contents in 145 lithologic oil pools in integration of the case study of representative lithologic oil pools and failured traps.The hydrocarbon accumulation in lithologic oil pools is primarily controlled by tectonic settings,hydrocarbon production and hydrocarbon drainage intensity in the source rocks wall rocks,and physical properties of reservoir rocks.The models for hydrocarbon accumulation tend to vary in different tectonic settings.The self production-self reservoir-self seal sandstone lenses oil pools occur in the depression zone;structural-lithologic sandstone lenses oil pools with enclosed physical properties and upward declined pinches of sandstone in the steep-slope zone,and fault-lithologic sandstone lenses oil pools with upward declined pinches of sandstone in the gentle-slope zones or on the flanks of the central anticlines.