准噶尔盆地东部隆起区磁场特征及对火山岩油气藏勘探的指示

火山岩型油气藏是准噶尔盆地十分重要的油气藏类型，近年来针对该类型油气藏的勘探在准东地区呈现出多点开花的场面。为了加快推进准东地区石炭系火山岩油气藏的勘探，本文通过高精度航磁、区域重力、地震和钻井资料对准噶尔盆地东部的断裂系统进行推断与解释，重点对该区磁性体的埋深开展分析。基于航磁计算的磁性体深度显示，准噶尔盆地东部隆起区磁性体最小埋深在0.5-2.2 km之间，清晰地呈现出南北分带，东西分块的构造格局。以隆起区中部一条近南北向深大断裂为界，东部和西部磁性体的深度、规模和形态存在明显差异。受次级断裂的影响，东部磁性体呈北东向展布，西部磁性体呈北西向和近东西向展布。依据断裂系统和磁性体埋藏深度对火山岩体油气成藏的控制，结合石炭系烃源岩生烃强度的展布，在准东地区预测出三个有利的火山岩油气藏勘探区带。

Magnetic field characteristics in the uplift area of eastern Junggar Basin and its implications for exploration of hydrocarbon reservoirs in volcanic rocks

Abstract: Volcanic rock reservoirs of hydrocarbon are very important types of reservoirs in Junggar Basin. In recent years, the exploration of this type of reservoir has shown a multi-blooming scene in the eastern Junggar Basin. In order to accelerate the exploration of Carboniferous volcanic reservoirs in the eastern Junggar Basin, the fault system in the eastern Junggar Basin is inferred and interpreted by high-precision aeromagnetic, regional gravity, seismic and drilling data, and the buried depth of magnetic bodies in the area is analyzed. The magnetic depth based on aeromagnetic calculation shows that the minimum buried depth of the magnetic body in the eastern uplift area of Junggar Basin is between 0.5-2.2 km, which clearly presents a tectonic pattern of north-south zoning and east-west zoning. Bounded by a nearly north-south deep fault in the middle of the uplift region, there are obvious differences in depth, scale and morphology between the eastern and western magnetic bodies. Under the influence of the secondary fracture, the eastern magnetic body is distributed in a northeasterly direction, while the western magnetic body is distributed in a northeasterly and near east-west directions. According to the control of fault system and magnetic buried depth to the hydrocarbon accumulation in volcanic rock mass, combined with the distribution of hydrocarbon generation intensity of Carboniferous source rocks, three favorable exploration zones of volcanic reservoirs are predicted in the eastern Junggar Basin.