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坡折带是层序划分样式的重要依据。大量地震剖面的精细解剖表明,琼东南盆地新近系的坡折带可以分为构造坡折带和沉积坡折带,构造坡折带进一步分为断裂坡折带和挠曲坡折带。不同的坡折带类型控制的储层沉积特征是不同的:构造坡折带的下倾方向一般发育一系列高成熟度、较高孔隙度的斜坡扇和盆底扇,是研究区较好的储集体;缓坡的沉积坡折带控制了斜坡扇裙和盆底扇的发育,陡坡的沉积坡折带控制了滑塌体的发育,沿陆坡向海方向形成了滑块、滑塌-泥石流、碎屑流-浊流的重力流演化序列。坡折带不但控制了储层的发育,而且控制形成有利的输导系统发育,坡折带及其控制的低位域砂体发育带是有利的勘探区带。
Slope break zone is an important basis for the order of division patterns. The detailed anatomy of a large number of seismic sections shows that the slope break zone of the Neogene in the Qiongdongnan Basin can be divided into structural slope break and sedimentary slope break zone, and the structural break break zone is further divided into the fault slope break and flexure slope break zone. The reservoir sedimentation characteristics controlled by different slope break zone types are different: the dip slope direction of structural slope break zone generally develops a series of high-maturity and high-porosity slope fans and pelvic floor fans, which is a good study area The sedimentary slope break zone of gentle slope controls the development of slope fan skirt and basin fan. The slope break belt of steep slope controls the development of the slump body, and forms the slide, slump-debris flow along the slope toward the sea, Debris flow - turbidity flow gravity flow evolution sequence. The slope break zone not only controls the reservoir development, but also controls the formation of a favorable system for the development of the guiding system. The slope break zone and its controlled low-zone sand body development zone are favorable exploration zones.