南美奥连特盆地东部斜坡带构造变形物理模拟

发布时间：2018-04-23 07:45

本文选题：物理模拟 + 正断层　；参考：《高校地质学报》2017年04期

【摘要】：南美奥连特盆地东部斜坡带发育大量与正断层反转活动有关的断背斜构造,也是非常有利的油气聚集区。文章主要应用比例化物理模拟实验方法,以奥连特盆地东部斜坡带为模拟对象,来分析早期正断层的陡缓程度、倾向组合以及断层间距等因素对正断层复活反转过程中断背斜构造形成的影响。模拟结果表明,当早期正断层均向挤压端倾斜时,如果陡倾角正断层更靠近挤压端,则陡、缓正断层都易发生反转,并形成断背斜构造。但当缓倾角正断层更靠近挤压端时,则该断层会吸收绝大部分的挤压量,而相对远离挤压端的陡倾角正断层不易发生反转。当早期正断层倾向相对时,距离挤压端更近的陡倾角正断层会吸收一定的挤压量,从而发生反转并形成背斜构造。而相对远离挤压端的缓倾角正断层是否发生复活反转则主要受断层间距的影响,距离越小越有利于断层反转。上述认识对在奥连特盆地东部斜坡带寻找与早期正断层反转有关的断背斜圈闭具有一定指导意义。
[Abstract]:A large number of faulted oblique structures related to normal fault inversion are developed in the eastern slope zone of Orlande Basin, South America, which is also a very favorable oil and gas accumulation area. In this paper, the scale physical simulation method is used to analyze the steepness of the early normal faults, taking the eastern slope of Olinte Basin as the simulation object. The influence of the tendency combination and fault spacing on the formation of the faulted oblique structure during the normal fault resurrection inversion. The simulation results show that when the early normal faults are inclined to the compression end, if the steep dip normal fault is closer to the extrusion end, then the steep and slow normal faults are prone to reverse, and the fault diagonal structure is formed. However, when the low-dip normal fault is closer to the extrusion end, the fault will absorb most of the extrusion amount, while the steep-dip normal fault which is relatively far from the extrusion end is not easy to reverse. When the early normal faults tend to be relative, the steep-dip normal fault closer to the compression end will absorb a certain amount of compression, which will reverse and form the anticline structure. However, whether or not the resurrection reversal occurs in the slow dip normal fault is mainly affected by the distance between the faults, and the smaller the distance is, the more favorable the fault inversion is. The above understanding has certain guiding significance for finding fault back oblique traps related to the early normal fault inversion in the eastern slope zone of Olinte Basin.
【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;中国石化勘探开发研究院;中国石油勘探开发研究院;
【基金】：国家自然科学基金(41472117) 国家科技重大专项(2016ZX05033-001;2016ZX05033-002;2016ZX05026-007) 中国石油大学(北京)科研基金(2462015YQ0105)联合资助
【分类号】：P618.13

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