Types and Patterns of Hydrocarbon Accumulation of Stratigraphic Reservoirs

Stratigraphic reservoir is divided into four types such as stratigraphic unconformity system reservoir,stratigraphic unconformity barrier reservoir,stratigraphic onlap reservoir and biohermal reservoir. The unconformity has developed layered textures,which provide favorable conditions for hydrocarbon accumulation. Hydrocarbon reservoirs are all found in the upper and the lower of unconformable surface. Such a new type of reservoir is defined as the stratigraphic unconformity system reservoir which is characterized by hydrocarbon accumulation within the unconformity structural system. The stratigraphic unconformity barrier reservoir is dominated by truncated unconformity and folded one. The overlap belt tends to shaping complex stratigraphic reservoir. Therefore,stratigraphic reservoirs are all closely related to unconformity,and possess distinct patterns for hydrocarbon accumulation. The distribution of unconformity is of play propery. Different from conventional recognition regarding the unconformity as barrier-like planner system,unconformity could provide premium storage spaces. The unconformity hydrocarbon accumulation or reservoir is affected by several factors,but unconformity is of instructed effect on the hydrocarbon accumulation.