摘要
丽水、椒江凹陷基本的构造样式是伸展构造，伸展运动主要发生在晚白垩世－早第三纪古新世，伸展运动过程具“幕式”渐进伸展的特点。研究区不同构造部位其伸展特征不同，表现为伸展率南大北小、最大伸展期南早北晚的特征。晚白垩世以来的伸展构造样式的演变大致可归纳为两个序列：丽水凹陷的断裂构造系统演变是由多米诺正断层系统演变为铲式或坡坪式正断层系统；椒江凹陷的断裂系统的演变是由非旋转的平面式正断层控制的地堑－地垒系统演变为铲式或坡坪式正断层系统。伸展运动控制着沉积序列、沉积体系的分布，从而控制着生储盖组合的空间展布。裂陷盆地在结构上可以归纳为三层结构（即基底、裂陷期层序和裂陷后层序），油气呈三层楼式分布。丽水、椒江凹陷地区主要的油气分布在裂陷期层序本身，自生自储式油气藏应是寻找的主要目标。
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 extensionalstructures 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 bynonrotational 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 rockassemblage. The fault basin architecture can be divided into three-layers structure, and also, oil and gas are distributedin 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.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1999年第4期316-320,共5页
Oil & Gas Geology
关键词
伸展运动
油气藏
分布规律
构造演化
沉积
Lishui-Jiaojiang Sag
extensional episode
extensional movement
extensional rate
oil-gas pools
distribution regularity
