COMBINE GRAVITY DATA TO INTERPRET THE DEEP SEISMIC REFLECTION PROFILE IN XINGCHENG AREA OF THE WESTERN LIAONING PROVINCE

Xingcheng area is located in the western Liaoning Province, China. It belongs to the Yanshan platform folding zone, which is located in north part of the North China craton. The southeast of the area is North China fault sag and the area is bordered by Inner Monogolian axis to the north. To explore the geologic structure at greater depths, SinoProbe-09 did a deep reflection seismic experiment in northeast part of Xingcheng, the length of the profile is about 21.93km. The data has been processed and interpreted. However, few have combined other kinds of geophysical data with seismic data to process and interpret the profile. Here, we adopt gravity data as a constraint to help processing and interpreting the seismic profile. First, get a density distribution of the profile through the inversion of gravity data. Then, make a comparison between the density distribution and the geologic map of the profile, the result is reasonable. Thus, the result can be adopted to optimize the velocity spectrum based on the relationship between velocity and density. With the new velocity spectrum, we process the seismic data to get a new seismic profile. At last, we interpret the new seismic profile and get more information about the geologic structure at greater depth.