Abstract: The Kuqa foreland basin is located in the west of China.It has experienced two stages of gravomagnetic and electric exploration. The first stage of reconnaissance was conducted in the 1950s.The object was to deal with the regional geological problem,such as the depression-uplift division,the distribution of faults and the thickness of sedimentary rock,as well as to provide the prerequisite for the subsequent seismic survey.In the 1990s,the second stage of detailed gravomagnetic and electric survey was carried out.A few seismic surveys were performed.Some exploration wells were drilled,and oil and gas shows were found.In combination with seismic data,the mountain, mountain front,deep-seated strata,salt and sub-salt and local structures were depicted,and the exploration targets were evaluated.The research was focused on the problem that seismic data could not reveal clearly.Fruitful achievements have been obtained during all the segments of the two stages.The geological tasks,technical competence and measurement precision involved in the first stage were much different from the second one.The combination of gravomagnetic technique with the seismic methods made it possible to achieve satisfactory results in the comprehensive understanding of mountainous area and mountain front under the complex terrain and geologic settings on surface and subsurface with the aid of mutual complement of multiple disciplines and a variety of information.

Key words: Songliao Basin, lithologic oil pool, controlling factors, exploration direction, delta front belt, lacustrine mudstone, fault

摘要： 库车前陆盆地是我国西部前陆盆地之一,重磁电勘探经历了2个阶段,20世纪50年代是概查、普查阶段,研究了坳隆展布、断裂分布、沉积岩厚度等区域地质问题,为地震部署作出了前期准备.20世纪90年代对库车前陆盆地已作出了大量地震测线,又打了一批探井,在见到油气的情况下,再次开展了重磁电详查及细测,结合地震研究了山及山前带、深层、盐及盐下构造、局部构造并进行了目标评价,以研究地震资料复杂区的地质问题为主要任务.在盆地不同勘探阶段,两期勘探工作都取得了丰硕成果,但两期勘探中要求解决的地质课题、技术水平、测量精度是不大相同的.20世纪90年代对库车前陆盆地联合运用重磁电与地震技术,实现多学科、多信息间互补,在解决地形、地表和地下地质条件复杂的山地、山前带的问题中取得了良好效果.

关键词: 库车坳陷, 山前带, 山地, 重磁电勘探, 多信息综合技术, 磁化率, 电阻率