关键词: 丽水, 椒江凹陷, 伸展幕, 伸展运动, 伸展率, 油气藏, 分布规律

Abstract: The basic structural style of lishui-Jiaojiang Say is extensional structure. The extensional movement happened in Late Cretaceous-Paleocene was charaterized by episodic progrssive extension. Different parts of extensional structures in the study area have different characters:the extensional rates change for small in the North to big in the south, and the period largest extension of in the south part was earler than that in the North part. Since Late Cretaceous, the evolution of extensional structural style could be classified into two orders:the evolution of domino-style normal faults to the listric or ramp-flat normal fault system in Lishui Sag; the evolution of groben-horst system controlled by nonrotational planar normal faults to listric or ramp flat normal fault in Jiaojiang Sag. The extensional movement controlled the distribution of sedimentary sequences and systems, and the spatial distribution of source-reservoir-cap rock assemblage. The fault basin architecture can be divided into three-layers structure, and also, oil and gas are distributed in three lagers. The oil-gas pools of Lishui-Jiaojiang Sag are distributed mainly in the rift-depressed sequence. The oilgas pools of self-generation and self-reservoiring should be the main target of exploration in Lishui-Jiaojiang Sag.

Key words: Lishui-Jiaojiang Sag, extensional episode, extensional movement, extensional rate, oil-gas pools, distribution regularity