关键词: 二维勘探, 观测方向, 高陡构造, 近地表结构

Abstract: According to seismic exploration theory, a deployment plan for 2D seismic exploration in principle requires the in-lines to be perpendicular to the structure strike to better reflect structural features. Crosslines are generally required to be parallel to the structure strike, thereby forming grids with the in-lines in order to control the structural feature in two directions. Study of actual seismic data, related literature, and previous studies of the high-steep structural area in the Hetao Basin, has revealed marked differences between descriptions of geological bodies based on seismic data obtained from 2D seismic lines with different observation orientations. Surface survey data from lines perpendicular to structures show abrupt near-surface changes. On the actual stacked profiles, the shielding and scattering effects of high-steep structures lead to a decrease in seismic data quality. The results of this study suggest that seismic lines in high-steep structural areas need not necessarily be arranged in strict correlation to structure strike. Instead, deployment should be considered comprehensively based on the near-surface data and overall seismic geological conditions.