Application of integrated geophysical survey in deep hydrocarbon exploration

The MH Basin is an intermontane fault-depression basin located in the northern Qinghai-Tibet Plateau, recognized as a typical “double-complex” area due to its intricate geological structures both on the surface and subsurface. The thick layer of unconsolidated sediments, including loess, red clay, and gravel, results in a low signal-to-noise ratio in seismic data, making deep imaging unclear and significantly hindering the understanding of the basin’s deep geological structure. This study integrates well-seismic data to develop a geological model and utilizes techniques such as magneticsource gravity anomaly correction, gravity complex lithology correction, and joint gravity-magnetic-wellseismic modeling and inversion. These methods effectively mitigate the impact of shallow and deep high-density, strongly magnetic strata, thereby restoring the original morphology of the Mesozoic basin and uncovering buried paleo-uplift structures within the depression.