东营凹陷八面河地区坡折带特征及其对地层岩性圈闭的控制作用

通过对东营凹陷八面河地区广利东洼陷边缘坡折带的识别标志、成因机制以及演化规律的研究,总结了该区坡折带对于地层岩性圈闭的控制作用,以便为地层岩性油气藏的勘探提供依据.研究表明,该区广利东洼陷边缘发育挠曲坡折带和断裂坡折带,构造活动是形成坡折带的主要因素.坡折带的演化规律与构造活动的阶段性演化或幕式构造作用相对应,也表现出多期性、幕式活动和差异性活动的特点,而且坡折带规模与构造活动大小有关.坡折带对地层岩性圈闭的控制主要表现为:坡折带附近是地层岩性圈闭发育的有利区带;规模较大的坡折带控制了多数地层岩性圈闭,地层岩性圈闭在纵向上发育具有继承性特点;坡折带在横向上可以存在较大的变化,可形成不同的圈闭类型;坡折带控制下的地层岩性圈闭含油气性十分有利.

Patterns of the slope-breaks in Bamianhe area of Dongying Sag and the controls of the slope, breaks on subtle traps

On the basis of studying the identification, the genetic mechanism and the evolution of the slope-breaks developed in the border of Guanglidong shallow depression in Dongying Sag, the controls of the slope-breaks on the subtle traps are discussed in order to provide the basis for the exploration of lithologic oil reservoirs. The results indicate that the slope-breaks are fault slope-breaks and bend slope-breaks, and the tectonic movements are the main controlling factors of forming the slope breaks. Matching with the episodic tectonic movements, the evolution of the slope-breaks is also multi-stage and episodic, and their scale is related to the range and intensity of tectonic movements. The controls of the slope-breaks on the subtle straps are reflected in the following aspects: usually, the subtle traps develope near the slope-breaks; the bigger slope-breaks control the distribution of subtle traps; the formation of subtle traps is successive in the longitudinal direction; the types and scales of slope-breaks greatly vary in the landscape orientation, which may form different types of subtle traps; the subtle traps controlled by the slope-breaks are very favorable to oil and gas migration and accumulation.