辽河西部凹陷欢喜岭地区沙河街组三段构造坡折带特征

Characteristics of structural slope-break zone in the 3^(th) submember of Shahejie Formation in Huanxiling area in the depression of western Liaohe

三维地震资料的精细解释结果表明,辽河西部凹陷欢喜岭地区沙河街组三段构造坡折带的主要类型是断裂坡折带,平面组合样式以树枝状和网状组合为主。其形成是构造活动、基底形态差异、沉积不均衡和差异压实共同控制的结果,其中构造作用是主控因素。依据构造坡折带对隐蔽油气藏的控制作用,将研究区划分为5个区带(Ⅰ-Ⅴ)。区内油气藏类型多以复合型岩性-构造油气藏为主,且紧邻构造坡折带,呈串珠状北东向分布。

Elaborate interpretion results of 3D seismic data show the main structural slope-break zone in the 3^th submember of Shahejie Formation in Huanxiling area in the depression of western Liaohe is fault slope-break zone, and the main plane combination styles are ＂dendritic＂ and ＂reticular＂. The formation is controlled by tectonic activity, morphological variation of basement, disproportion of deposition and differential compaction, and tectonic activity is the main controlling factor. According to the controlled action of structural slope-break zone to subtle reservoirs, it has been divided into five zone （ Ⅰ -Ⅴ ）. The reservoir type in the studied area is mainly compound lithologic-structural reservoir which next to structural slope-break zone, and spread in the north-east trending with moniliform shape.