三维重磁电勘探技术发展及应用

自20世纪90年代中后期开始研发的三维重磁电勘探技术,目前已在采集、处理、解释方面形成了配套技术。该技术在追踪特殊岩性体分布和研究深层构造异常方面,较传统的二维勘探有明显优势。文章介绍了三维重磁电技术的特点,即:数据采集方式以面元为单位,测点部署为均一网格;以空间域数据体为资料处理单元,充分考虑体积效应影响,保证了异常的可靠归位;实现了三维可视化资料解释。通过在塔里木、柴达木盆地、南方碳酸盐岩等复杂区应用的案例,指出三维重磁电勘探技术作为地震勘探的有效补充,可以配合地震开展复杂区局部岩性异常体分布及深层构造综合研究。

Development and Application of 3D GME Prospecting Technology

3D gravity-magnetic-electromagnetic technology began in the middle and late 1990s, and has been greatly improved in data acquisition, processing and interpretation. It has apparent advantages over the traditional 2D one in terms of investigation of local lithosome and deep structures. This paper introduces the characteristics of the technology: (a) It adopts small-bin data acquisition and the site grid keeps a constant spacing. (b) All data is involved in data processing due to the volume effect, so the anomaly obtained is the real response of underground inhomogeneity. (c) 3D data is interpreted with visualization in the united platform. The technology has been successfully applied in some complicated surface areas, such as Tarim Basin, Qaidam Basin, and the carbonate area in southern China. The experience implies that the integrated 3D GME technology could be an important complementarity of seismic exploration for the investigation of local lithosome and deep structures.