西北断陷盆地覆盖区填图方法探索——新疆巴里坤盆地填图实践

西部断陷盆地覆盖区覆盖层与基岩面地质结构及盆山关系是当今覆盖区区域地质调查研究需解决的重点与难点。基于新疆巴里坤山间断陷盆地覆盖区地质填图试点实践,梳理出断陷盆地区地质填图的基本内容和填图目标;强调覆盖区地质调查必须针对需解决的关键地质问题,贯彻地表地质调查—地球物理探测—钻孔验证相结合的基本工作思路;确定出普适性的填图技术路线和围绕填图目标及基本内容的针对性填图方法组合;最后以巴里坤断陷盆地填图为例,从调研目标的确定到物探工作及方法组合优选和钻探布设,系统介绍了巴里坤断陷盆地覆盖区地质填图的方法体系,并最终落实到地质填图成果的体现,成为西部断陷盆地覆盖区地质填图的示范。

EXPLORATION OF GEOLOGICAL MAPPING METHODS ON COVERED AREA OF FAULTED BASIN IN THE NORTHWEST CHINA: A MAPPING PRACTICE IN THE BARKOL BASIN, XINJIANG

The geological texture of bedrock surface and overburden cover, and the basin-mountain coupling relationship are the key and difficult points in the regional geological survey of the covered areas of faulted-basin in the western China. In this paper we sorted out the mapping target and mapping contents to the covered region of faulted-basin based on the geological mapping practice in the Barkol basin, emphasized that the geological survey in the covered region must be aimed to solve the key geological problems and combination of surface geological survey, geophysical exploration and drilling verification, and determined the general mapping technical route and the combination of mapping methods. As an example, this paper also systematically introduced the mapping methods in the Barkol faulted-basin, including determining mapping targets and contents, optimizing geophysical exploration methods, and laying out drilling work.