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泌阳凹陷是一个第三系陆相沉积的断陷湖盆,面积仅1000平方公里,含油比较丰富。双河水下冲积扇形成的岩性上倾尖灭油藏,发育于凹陷南部的下第三系核三段。双河水下冲积扇,具有一些特点:1、岩性以分选差的粗碎屑为主,层理以块状层理和递变层理较为常见;2、沉积韵律以多次洪水浊流形成的复合及复合反韵律为主;3、粒度以洪水浊流型为主;4、水下冲积扇的几何形态,平面呈扇状,剖面呈楔状;5、水下冲积扇可分为扇根、扇中、扇端三个亚相带;6、扇体的顶部发育了另一种砂体类型——水下河道浊积岩。油田主要形成于扇中和扇端部位,圈闭类型为多层砂岩上倾尖灭的岩性圈闭。
Biyang depression is a Tertiary continental facies sedimentary lake basin, an area of only 1,000 square kilometers, rich in oil. The Shuanghe subaqueous alluvial fan formed a lithologic up-dip reservoir that developed in the third member of the Lower Third Series in the southern part of the depression. Shuanghe subaqueous alluvial fan, has some characteristics: 1, the lithology is poorly sorted coarse crust, bedding to blocky bedding and graded bedding is more common; 2, depositional rhythm to multiple flood turbidity The formation of complex and complex rhythm; 3, the particle size of flood turbidity-based; 4, the geometry of underwater alluvial fan, the plane was fan-shaped, section was wedge; 5, underwater alluvial fan can be divided into fan , Fan, fan-end three sub-facies; 6, the top of the fan body developed another sand body type - underwater channel turbidite. The oil field is mainly formed in the fan and fan-end parts, and the trap type is a lithologic trap with multi-layered sandstone dip-off.