Study on coalfield structure characteristics in Changdu Area based on remote sensing and gravity- magnetic data

In order to solve the weakness of coalfield exploration in Changdu Area and the difficult problem of geological survey, in this article, the fracture distributi on and its deep structure were analyzed through remote sensing data and gravity-aeromagnetic data. Gravity and magnetic anomalies showed that Lancang River fault was the regional deep fault, which was characterized by relatively low and long strips of gravity. Gravity anomaly was-540 mGal within the zone, -460 mGal on both side s, separated with regional gravity gradient belt. South side of Lancang River fault showed a high density, high magnetic characteristics. The gravity field was commonly- 470 --500 mGal on north side, and characterized by gentle and stable changes. The coal measures were more exposed in transitional zones between relative gravity hi gh and relative gravity low in Changdu Basin. According to the OLI images and DEM, it could be known that the faults were northwest mainly, and northeast partly. Fract ure density gradually reduced from the south to the north. Coalfield structure framework of Changdu Area was characterized by extrusion. Coal deformation partitioning presented the parallel bands structure. Deformation intensity decreased from south to north. Coal measures mainly distributed in central, north and northwest of Chang dou Basin.