东营凹陷辛镇构造复杂低级序断裂体系形成的构造物理模拟实验

东营凹陷中央隆起带的辛镇构造是被2条平行的二级断层切割而形成的长条状地堑，地堑内的低级序断裂体系控制复杂断块油藏的油水分布。为客观认识低序级断层与高级序断层的几何关系以及复杂低级序断裂体系的形成和演化，以指导低级序断层组合，进而指导复杂断块油藏开发中后期挖潜，按辛镇构造的地质条件进行构造物理模拟实验。模拟结果证实，在拉张应力作用下，2条平行的高级别断层之间可以形成低级别的弧形断裂，弧形断裂包括单个弧形、波状弧形和套叠式弧形等不同的构造样式。弧形断裂的几何特征与岩石颗粒非均匀的质点位移密切相关。图6参6

Structural modeling experiments of complex low-grade fracture system in the Xinzhen structure, Dongying Sag

The Xinzhen structure is an oblong graben in the central uplift zone of Dongying Sag, consisting of two parallel sub-faults. The low-grade fracture in the graben controls the oil and water distributions in the complex fault block oil pool. For understanding objectively the geometric relation between low-grade fault and high-grade fault, and the formation and evolution of complex low-grade fault, the new structural modeling experiments are conducted, which are significant for promoting further hydrocarbon exploration and development in the complex fault block of Shengli Oilfield. The experiments are conducted under similar geological conditions of Xinzhen structure. The experiments prove that low-grade arc-like fractures, including single arc, wave arc, multi-arc, etc, may form between two parallel high-grade fractures under extension stresses. Geometric characters of arc-like fractures are in close relationship with inhomogeneous particle displacement of rock grains.