临南油田沉积微相模式及剩余油分布

MICRO-FACIES MODELS AND DISTRIBUTION OF REMAINING OIL IN LINNAN OILFIELD

临南油田位于渤海盆地惠民凹陷临南洼陷的夏口断裂带上 ,沙三中至沙二段构成一个完整的三角洲沉积 ,其中沙三中段为三角洲前缘沉积 ,沙三上段为三角洲前缘和三角洲平原沉积 ,沙二段为三角洲平原沉积。本区油藏为构造层状油藏 ,油气富集除受构造控制外 ,还受沉积微相的控制。同时 ,沉积微相还控制了剩余油的分布。在平面上 ,剩余油主要富集在陆上分支河道的突出部位、水下分支河道的井网稀疏区。

Linnan oilfield is located in Xiakou fracture belt in Linnan sag of Huiming depression in Bohai Bay basin. The deposition from Es_3 to Es_2 is a complete delta deposition system. The middle of Es-3 is the delta front, the upper Es-3 is delta front and delta plain, and the Es\-2 is delta plain. The oil reservoir is of structure-stratigraphic property, so the petroleum accumulation is controlled by structure and the distriblution of depositional micro\|facies which controlles the distribution of remaining oil. The beneficial areas to the remaining oil distribution are as follows: the protruding parts of above-water branch river, the rare areas of wells in bellow-water branch river, thin sandstone in debouch bar.