Application of High‐Precision Microgravity Detection Technology in the Exploration of Ultradeep Gas Reservoirs in the Middle Part of the Southern Margin of Junggar Basin

This study is aimed at identifying the ultradeep gas reservoir structure and gas‐rich areas in the middle section of the southern margin of the Junggar Basin. Based on high‐precision microgravity data collected from the complex terrain areas of Huxi and Tudong in the middle section of the southern margin of the Junggar Basin, residual gravity anomalies of deep reservoirs were extracted after numerical conversion and various corrections. Combined with comprehensive geological interpretation, favorable areas for natural gas exploration in the Lower Cretaceous and Upper Jurassic were delineated. The results demonstrate that high‐precision microgravity detection offers significant advantages including cost‐effectiveness, environmental friendliness, rapid implementation, and the ability to reflect overall planar effects in optimizing gas reservoir targets. The microgravity results show strong consistency with geological features seismic profile characteristics and gas enrichment patterns observed in drilling wells. Continuous and stable low residual gravity anomalies effectively characterize gas traps and enrichment zones. As a geophysical method for oil and gas exploration, microgravity technology can be integrated with seismic methods or applied independently in areas where seismic data acquisition is challenging. This study significantly expands the application of microgravity detection in natural gas exploration marking its first use in the exploration of deep sandstone gas reservoirs at burial depths exceeding 7300 m. Moreover, in complex mountainous terrain where seismic acquisition and processing are difficult, high‐precision microgravity detection proves to be an effective technique for gas reservoir exploration.