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

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.