大地电磁测深法在滨北西部斜坡带油气地质调查评价中的应用  

The application of magnetotelluric sounding method to oil-gas geological survey and evaluation of the western slope area of Binbei

作　　者：彭炎 张小博[1,2,3] 张健 张鹏辉[1,2] 袁永真[1,2,3] 姜春香 PENG Yan;ZHANG Xiao-Bo;ZHANG Jian;ZHANG Peng-Hui;YUAN Yong-Zhen;JIANG Chun-Xiang(Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China;National Center for Geological Exploration Technology,Langfang 065000,China;Electromagnetic Detection Technology Key Laboratory of Natural Resources,Langfang 065000,China;Shenyang Center of Geological Survey,CGS,Shenyang 110034,China)

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]国家现代地质勘查工程技术研究中心,河北廊坊065000 [3]自然资源部地球物理电磁法探测技术重点实验室,河北廊坊065000 [4]中国地质调查局沈阳地质调查中心,辽宁沈阳110034

出　　处：《物探与化探》2020年第3期656-664,共9页Geophysical and Geochemical Exploration

基　　金：中国地质调查局地质调查项目(DD20190030,DD20190032)。

摘　　要：资料显示松辽盆地的石炭—二叠系具有较大的生烃潜力和油气资源前景,有望成为未来松辽盆地深层油气勘探突破的重点层系,但是,石炭—二叠系地层的分布无论在方法技术和认识方面仍存在较大的不确定性。因此,本文围绕沈阳地质调查中心位于西部斜坡带的黑富地1井部署了一条大地电磁测深剖面,通过野外试验优选了采集参数,获得了高质量的原始数据;通过数据分析、利用共轭梯度法反演获得了电性结构剖面,并结合钻井、地震等资料开展综合分析。结果表明,黑富地1井附近发育两条横向稳定展布的低阻层,其中第一套低阻层埋深在300~800 m之间,是白垩系地层高泥质含量地层的电性响应,第二套地层位于T5界面之下1.5~2.5 km之间,横向起伏幅度较小,结合钻井资料推测反映二叠系林西组泥岩层;并结合深层气体的主控因素,预测了油气有利部位。这些认识为松辽盆地石炭—二叠系油气资源的评价提供了可靠的地球物理依据和技术储备。In recent years,more and more data show that the Songliao Basin has a large hydrocarbon generation potential and oil-gas resource prospect,and is expected to become the key stratigraphic horizon for the deep oil-gas exploration breakthrough in the Songliao Basin in the future.However,The distribution of the Carboniferous-Permian strata still has large uncertainties in terms of method,technology and understanding.In view of such a situation,the authors deployed a magnetotelluric sounding profile around the Heifudi-drill hole in the western slope zone of the Shenyang Geological Survey Center.The field parameters were used to optimize the acquisition parameters and thus high quality raw data were obtained.Through data analysis and conjugate gradient method,the electrical structural profiles were obtained and,in combination with drilling,seismic and other data,a comprehensive analysis was conducted.The results show that two horizontally stable low-resistance layers are developed near Heifudi-1 drill hole,and the first set of low-resistance layers is buried between 300 to 800 meters,which is the electrical property of the Cretaceous strata with high muddy content.In response,the second set of strata is located between 1.5 to 2.5km below the T5-Interface,and the lateral undulation is small.Combined with the drilling data,it is considered to reflect the mudstone strata of the Permian Linxi Formation.Combined with the main controlling factors of deep gas,the favorable zone of oil-gas has been predicted.These insights provide a reliable geophysical basis and technical reserve for the evaluation of the Carboniferous-Permian hydrocarbon resources in the Songliao Basin.

关 键 词：大地电磁测深 油气资源评价 滨北地区 西部斜坡带 林西组 

分 类 号：P631[天文地球—地质矿产勘探]