Structural controlling conditions for dry hot rock reservoirs in the middle section of the northern margin in the North China Block

Abstract

According to a comprehensive analysis of regional geology–geophysics, this article focuses on structural conditions for dry hot rocks in the middle section of the northern margin of the North China Block and adjacent areas, revealing the controlling effect of the structure of dry hot rock reservoirs. Based on processing the latest high-precision data from an aeromagnetic survey, studying the characteristics of aeromagnetic anomalies such as geophysical field boundaries, anomaly zones, and anomaly dislocation lines, and quantitative calculation results of wavelet analysis and other methods, this study discusses the characteristics, scales, and cutting relationships and further clarifies the levels, active periods, and relative strengths of the faults in the middle section of the northern margin of the North China Block and its adjacent areas. According to their aeromagnetic data and aeromagnetic identification mark, faults in the studying region are determined in detail. The study region mainly develops four groups of regional faults. The main faults in this region are in the near-EW, NE, SN, and NW directions. Their interlacing and overlapping constitute the complex structural features of the study area and control regional magmatic activity. The deep faults are important channels for upwelling deep heat sources and the eruption or intrusion of magma. The control degree of regional faults in different directions on magmatic activity differs. Next, we discuss the fault system and its mutual control and propose that the faults in the near-NW direction also have great importance in tectonic evolution in the northern part of the North China Block and merit more attention.