山东汶西凹陷边界断裂演化特征及其对沉积砂体的控制

在野外地质调查和室内资料处理的基础上,详细研究了鲁西地区汶西凹陷边界主干断裂的几何学、运动学特征,探讨了盆地边界主干断裂与旁侧低级构造的形变关系和形变规律,划分了构造形变期次,恢复了盆地自中生代以来的古构造应力场。分析了弧形边界主干断裂的控盆作用,认为不同地史时期边界断裂活动的不均衡性导致了盆内沉积砂体的发育在时间和空间上随沉降中心的迁移而发生变化,指出了边界弧形断裂与其横张断裂交汇部位为盆内古、今物源入口处,是砂体发育部位。 

EVOLUTIONARY CHARACTERISTICS OF THE BOUNDARY FAULT OF THE WENXI DEPRESSION,SHANDONG,AND ITS CONTROL ON SEDIMENTARY SAND BODIES

Based on field geological surveys and indoor data processing,the authors have intensively studied the geometric and kinematic characteristics of the major boundary fault (named the Nanliu fault) in the Wenxi depression and the deformation relationship and patterns of the major boundary fault and the secondary structures on the two sides of the major fault,defined the phases of the tectonic deformation and reconstructed the paleotectonic stress field.After their analysis of the basin-controlling effect of the major arcuate boundary,they think that the uneven movements of the boundary fault in different geological periods resulted in changes of the development of sand bodies in the basin with the migration of the subsidence center with time and space.The authors point out that the intersection positions of the arcuate boundary fault and its transverse tensional faults are inlets of ancient and present source materials and sites where sand bodies are developed.