关键词: 古龙断陷, 火山岩, 重磁方法, 勘探评价

Abstract:

This paper analyzes the gas reservoir formation rules in Xujiaweizi deep volcanics, northern Songliao basin, studies four controls of gas reservoir formation, including gas generation intensity, big faults, structural traps and highly-porose acid volcanics. Based on drilling and geological data, this paper studies the formation, reservoir, and caprock of gas reservoir in deep volcanics in Gulong rift basin, uses gravity-magnetic anomalies which are highlighted through processing the weak gravity magnetic data to interpret the fault and volcanic lithology, and uses 2D seismic data to interpret the structure, based on these, structural traps are marked and their hydrocarbon potentials are forecasted in favorable areas according to sedimentary thickness. Based on a synthetic evaluation of favorable hydrocarbon areas, fault zone, structural traps and volcanics, this paper presents a favorable exploration target area where lies inside favorable hydrocarbon area, along faults, within structural traps and developed volcanic caprocks.

Key words: Gulong rift basin, volcanics, gravity-magnetic method, evaluation on exploration