重磁电一体化勘探技术在柴达木盆地西部复杂地区的应用

以柴达木盆地西部为代表的复杂山地地区,是我国重要的油气资源勘探远景区。由于受复杂地表条件、复杂地质构造双重因素的影响,油气勘探难度大。首次采用三维重磁电综合地球物理勘探方法在柴达木盆地西部复杂地区开展油气勘探攻关。三维大地电磁资料采集以面元为单位代替传统排列式采集,重力资料采集利用正交高密度基点网法提高采集精度。针对研究区的三维重磁电资料,采用三维预处理技术压制地形及局部不均匀体的影响,利用钻井资料作为约束,进行三维反演处理,获得了研究区地层电阻率、密度的空间分布。结合钻井、地震等资料对研究区开展了综合石油地质解释评价,提出了有利的勘探目标。

Some of the rugged mountains such as the western Qaidam Basin are important prospective exploration targets for hydrocarbon resources in China.Owing to the complicated topography and geo-structure in those areas,hydrocarbon exploration is difficult.To solve the problem,the integrated exploration with 3D gravity,magnetic and electromagnetic method was carried out firstly in the western Qaidam Basin.The routine area measurement is adopted in data acquisition for gravity and magnetic surveys.Data acquisition technology with independent bins was carried out in 3D MT.3D statistical low-pass filtering which based on spatial domain has been used to eliminate the influence of terrain and surface lithology.We carried out 3D inversion on gravity-magnetic-electric data and performed 3D comprehensive interpretation to 3D inversion results under the constraints of drilling data,which reveals the distribution of resistivity and density of target area.

国家油气专项“全国油气资源战略选区调查与评价(2004XQ)”和中国地质调查局地质矿产调查评价专项项目(DD20160094-1)联合资助。