Volcanic Rock Distribution and Gas Abundance Regularity in Xujiaweizi Faulted Depression of Songliao Basin, China

By a newly proposed band filter, second derivative by multiple upward and downward continuation, which utilizes continuation height and iteration number to modulate frequency and enhance target layer information, the aeromagnetic data of Xujiaweizi depression, the most highly studied area in Songliao Basin, are processed to extract volcanic anomalies. With comparison of drilling data, the extracted aeromagnetic anomalies well correspond to the distribution of volcanic rocks. According to aeromagnetic anomalies in combination with drilling and seismic data the plane distribution of three volcanic formations is predicted. It is shown that aeromagnetic gradient belts near or connected to hydrocarbon source are gas abundance zones with well‐developed volcanic reservoirs. This point of view will play an important guiding role in gas exploration deployment in Songliao Basin, and even benefit for gas exploration in other areas in China.