浙皖下扬子区小构造分区的宏观、显微构造特征与油气演化

THE RELATIONSHIP BETWEEN THE CHARACTERISTICS OF THE STRUCTURE AND MICROSTRUCTURE OF THE STRUCTURAL ZONES AND THE OIL/GAS EVOLUTION IN ANHUI AND ZHEJIANG PROVINCES, THE LOWER YANGTZE AREA

李家彪

Li Jiabiao

国家海洋局第二海洋研究所, 杭州 310000

Second Institute of Oceanography, State Oceanic Administration

本文在进行大量宏、微观构造观察的基础上,通过小构造的分区研究和变形温度的测定,结合区域有机地化和油气分布特征,将浙皖下扬子区从浅至深分为挠曲区、破-流劈理区和叶理-流动区三个构造区(变形温度主值分别为350℃、420℃、>500℃),它们形成于印支-早燕山期的强烈的陆内造山运动.各小构造区处在不同的油气演化阶段,即叶理-流动区为干气后阶段,破-流劈理区为过成熟阶段,挠曲区为成熟或高成熟阶段.

In this paper,it is proposed that the structures in the Lower Yangtze Area of Anhui and Zhejiang provinces can be divided into three structural zones from shallow to deep as the flexural,breakage-flow cleavage and fliated flow zones with the deformation temperatures of 350℃,420℃ and 500℃ respectively,based on the structural observations and microscopic analysis,as well as the measurements on deformation temperatures.All the structural zones developed during the period of intracontinental orogenesis from the In-dosinian to Early Yanshanian and they have obvious controls over the maturities of the Paleozoic organic materials in the area depending on regional geochemical studies and the oil/ gas distribution.It is,however,suggested that the established relationship between the structural zones and the evolution stages of the Paleozoic organic materials show the fliated flow zone corresponding to the post dry gas stage,the breakage flow cleavage to over-matue stage and the flexure to mature or high level of mature stage respectively for the oil/gas evolution in the area.

https://doi.org/10.11781/sysydz199302160