Work

Positive low-amplitude structural features in the southwestern Ordos Basin based on gravity and seismic data

Year: 2025

Type: article

Abstract: This study systematically collects and compiles existing surface gravity data to investigate the characteristics of the positive low-amplitude structures in the southwestern Ordos Basin. As the local gravity anomaly, the high-pass filtered gravity anomaly was obtained using the regularisation filtering method. By integrating the seismic profile data, we conducted an in-depth analysis of the correlation between the amplitudes of the local gravity highs and their corresponding structural amplitudes, thereby identifying the characteristics of the positive low-amplitude structures in the southwestern Ordos Basin. The results indicate a strong correlation between the local gravity highs and the positive structures in the southwestern Ordos Basin. A highly linear relationship exists between the amplitudes of the local gravity highs and their corresponding structural amplitudes, suggesting that smaller gravity highs correspond to lower structural amplitudes. The positive low-amplitude structures are extensively developed in the Yishan Slope, the Tianhuan Sag, and the Weibei Uplift, whereas they are rarely observed in the Western Edge Thrust Belt.

Source: All Earth

DOI: 10.1080/27669645.2025.2555072