Abstract:

A series of tiny amplitude structure attracted by the en echelon fault blocks ranged NW—SE is developed in Kumugeliemu group in western Tahe Oilfield．This paper evaluated the hydrocarbon—bearing quality of traps through the muhidisciplinary analysis of hydrocarbon migration and accumulation direction and identifying fluid properties by seismic multi—attributes analysis，evaluated the implementation degree of traps by qualitative trap identification techniques such as geomechanical model and by the quantitative trap interpretation techniques such as seismic time slice，coherency analysis technique and variable velocity mapping．Based on these，a series of comprehensive evaluation technique of tiny amplitude structure was formed to guide the rolling evaluation effectively．The research results show that the oil and gas of Kumugeliemu group reservoirs has the characteristics of“vertical adjustment，lateral migration and reservoir controlled by the fault”．There is a positive correlation between the closed amplitude of tiny structural traps and the development scale offauh．The abnorm al arc length attribute can be reference to discriminate the fluid properties accumulated in the traps．

Key words: the interval of oil shale, microscopic pore and fracture, reservoir properties, oil potential, Damintun Depression