序言被动陆缘含有某些世界性大油气区。为了解释被动陆源地质演化,已提出了多种模型。其中如 MaKenzie(1978)的模型就能满意地把理论和被动裂谷边缘的总体构造史协调一致起来。大陆板块内的引张,最初形成一个裂谷。当引张继续而达到全面破裂时,洋底即开始扩张而形成被动裂谷边缘,其时,引张停止,边缘或夭折裂谷由于热力收缩与冷却,相应开始按指数律沉降。陆缘发展的这种后裂谷期或被动沉降期通常以碎屑楔状体向洋或向盆进积 Preamble Passive margins contain some of the world’s largest oil and gas areas. In order to explain the geological evolution of passive terrestrial sources, a variety of models have been proposed. Among them, the model of MaKenzie (1978) can satisfactorily reconcile the theory with the overall tectonic history of the passive rift margin. The extension within the continental plate initially formed a rift. When the continuation of the extension leads to a complete rupture, the ocean floor begins to expand to form a passive rift edge. At that time, the extension of the extension ceases and the edge or abrupt rift valley begins to settle exponentially due to thermal contraction and cooling. This post-rift or passive subsidence of marginal lands usually occurs in the form of detrital wedges toward the ocean or into the basin