胶莱盆地莱阳凹陷莱西断层断裂性质及成因机制

发布时间：2018-11-16 06:58

【摘要】：为了明确胶莱盆地莱阳凹陷莱西断层的断裂性质及成因机制,利用莱阳凹陷重力资料及新采集处理二维地震资料,对莱西断层进行识别与描述,并对其几何学特征和形成机理进行分析。莱西断层发育带状展布、花状构造、海豚效应等构造样式,并且断层两侧地质体沿断层走向左行错开约4.4 km,是一条典型的左行走滑断层。晚白垩世末期—古新世时期,研究区构造应力场为NEE-SWW向挤压,牟平—即墨断裂带由晚白垩世早期的伸展作用转换成右行走滑,而莱西断层剪切方向与其相反,是牟平—即墨断裂带的共轭左行走滑断层。莱西断层并不控制白垩纪地层的沉积,因此不是莱阳凹陷的西部控凹断层,而是凹陷内部的一条分带断层,在其切割作用下莱阳凹陷被分成东西2部分。
[Abstract]:In order to clarify the fault nature and genetic mechanism of the Laixi fault in the Laiyang sag of Jiaolai Basin, the Laiyang fault is identified and described by using the gravity data of the Laiyang sag and the new acquisition and processing of two-dimensional seismic data. The geometric characteristics and formation mechanism are analyzed. The Laixi fault is a typical strike-slip fault with banded distribution, flower-like structure, dolphin effect and so on, and the geological bodies on both sides of the fault stagger about 4.4 km, along the left direction of the fault. During the late Cretaceous to Paleocene, the tectonic stress field in the study area was NEE-SWW compressional, and the Muping-Jimo fault zone was converted from the early late Cretaceous extension to right-lateral slip, while the Laixi fault shearing direction was opposite to that of the fault zone. It is the conjugate left strike-slip fault of Muping-Jimo fault zone. The Laixi fault does not control the deposition of Cretaceous strata, so it is not the western concave fault in Laiyang sag, but a zonation fault inside the sag, which is divided into two parts.
【作者单位】：中国石油大学地球科学与技术学院;中国石化胜利油田分公司勘探开发研究院;中国石油大学(北京)地球科学学院;
【基金】：中国石油化工股份有限公司油气勘探专项(P13134)资助
【分类号】：P618.13

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