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宽扎盆地为一典型的早期裂谷与晚期被动大陆边缘叠合含盐盆地。盆地的形成经历了3期构造演化:裂谷阶段、过渡阶段和被动大陆边缘阶段,在过渡阶段发育厚层的盐岩。盐岩沉积后的演化主要受到了3种驱动因素(动力学机制)的控制,使得盐岩总体上呈现出“西厚东薄”的分布特点。盐岩沉积后的演化在一定程度上控制了盐上沉积地层的分布、盐相关圈闭的形成以及盐窗的分布等。根据盆地东西部盐岩演化的动力学机制和现今盐岩发育特点,把宽扎盆地划分为盐伸展区和盐挤压区。二者油气运移和聚集的规律是有所不同的,从而导致盐伸展区和盐挤压区的勘探潜力和勘探方向有所不同。
The Kwanza basin is a typical early rift superimposed with the late passive continental margin. The formation of the basin underwent three tectonic evolutions: the rift phase, the transitional phase and the passive continental margin phase, and the development of thick salt rock during the transitional phase. The evolution of salt rock after sedimentation is mainly controlled by three kinds of driving forces (dynamic mechanism), which makes the salt rock generally show the distribution characteristics of “west thick east ”. The evolution of salt rock after deposition controls to some extent the distribution of salt strata, the formation of salt-related traps and the distribution of salt windows. According to the dynamic mechanism of salt rock evolution in the eastern and western parts of the basin and the characteristics of current salt rock development, the Kwanza basin is divided into salt extension area and salt extrusion area. The laws of hydrocarbon migration and accumulation are different, resulting in different exploration potentials and exploration directions in the salt extension area and the salt extrusion area.