CAJ | 학술논문

盆地周边地质调查是研究盆地构造演化的一种重要补充手段，露头区断层活动规律可以直观分析盆地内观察不到的断层性质。本文主要研究了磁村断层的野外地质特征及其对沉积的控制，并类比了沉积盆地内的断层对沉积的控制。研究发现磁村断裂带内地质现象丰富，发现有擦痕、阶步、碎裂灰岩、牵引褶皱、石香肠构造、菱形构造等，其中石香肠构造和菱形构造受控于岩性及断裂带内局部应力场变化，与其他证据共同指示磁村断层为一条右旋伸展-走滑断层。在此基础上分析了磁村断层走滑活动模式及对沉积扇体的控制，并针对断层走滑活动的沉积响应，在沉积盆地内找到了多处伸展-走滑型断层和走滑-伸展型断层控沉积的沉积迁移现象，且发现了走滑伸展作用产生的斜歪扇背斜现象。这种控制作用使沉积砂体沿断层走向展布，进而控制油气成藏和分布。综合分析认为，磁村断层形成于晚中生代以来鲁西地块的张扭性应力场，是鲁西隆起不同块体差异伸展所致，起调节不同块体应变的作用。
분지주변지질조사시연구분지구조연화적일충중요보충수단，로두구단층활동규률가이직관분석분지내관찰불도적단층성질。본문주요연구료자촌단층적야외지질특정급기대침적적공제，병류비료침적분지내적단층대침적적공제。연구발현자촌단렬대내지질현상봉부，발현유찰흔、계보、쇄렬회암、견인습추、석향장구조、릉형구조등，기중석향장구조화릉형구조수공우암성급단렬대내국부응력장변화，여기타증거공동지시자촌단층위일조우선신전-주활단층。재차기출상분석료자촌단층주활활동모식급대침적선체적공제，병침대단층주활활동적침적향응，재침적분지내조도료다처신전-주활형단층화주활-신전형단층공침적적침적천이현상，차발현료주활신전작용산생적사왜선배사현상。저충공제작용사침적사체연단층주향전포，진이공제유기성장화분포。종합분석인위，자촌단층형성우만중생대이래로서지괴적장뉴성응력장，시로서륭기불동괴체차이신전소치，기조절불동괴체응변적작용。
Field observation around a basin is an important way to understand tectonic evolution of the basin. Moreover, the geological characteristics of the outcrops could be applied to the faults which are not directly observed in the basin. This paper focuses on the geological characteristics of the Cicun Fault in the western Shandong Uplift and its effect on the deposition. Furthermore, an analogy between the outcrop and the basin in regarding of the sedimentary responses to the fault activity is conducted. There are a variety of strike-slipping-related geological characteristics in the fault zone, such as scratches, steps, limestone cataclasites, drag folds, two types of boudins, “rhombic structure”. What’s more, the boudinage and “rhombic structure” are controlled by the lithological changes and local change of tectonic stress field. The linear structure, together with other evidence indicates that the Cicun Faults is a right-lateral normal strike-slip fault. The activity model of the Cicun Fault and its sedimentary responses are summarized. The Cicun Fault is also characterized by several imbricate sedimentary facies along the obliquely-slipping faults in Jiyang Depression, as well as the inclined fan-folds. Consequently, the sand bodies distributing along the strike controlled the formation of oil reservoir. Based on the comprehensively study, the results indicate that the Cicun Fault developed under the trans-extension at the Late Mesozoic, and it was resulted from the adjustment of the differential extension between the sub-blocks in the western Shandong Uplift.