The interpretation and inference of gravity anomaly and the prediction of salt formation prospect in Yanyuan basin
CHEN Ting1(), YAN Di1, YU Zhou1, QU Chen2, RAN Zhong-Yu1, QIU Long-Jun3
1.Geophysical Prospecting Party of SBGMR,Chengdu 610072,China 2.Institute of Geology,CAGS,Beijing 100037,China 3.School of Geophysics and Information Technology, China University of Geosciences(Beijing),Beijing 100083,China
Yanyuan basin is a Cenozoic sedimentary basin in southwest Sichuan basin, where Baishan Formation strata and Yantang Formation strata have rich rock salt. There are four drill holes and a producing well in the salt range of Yanjinggou area, and although the drilling depth of Pu-3 well is 1 001 meters, it does not intersect the salt deposit. The latest 1:50 000 gravimetric data were employed and processed in this paper to build geological-geophysical model of rock-salt minerals by integrating the physical characteristics with gravity anomaly features of rock salt deposit, and a gravimetric profile was simulated by performing the 2.5D forward modelling calculation to infer the geometric and physical parameters of the geological bodies that result in local anomalies. Based on the interpretation of gravity anomalies and the geological understanding of Yanyuan basin, the authors predicted two prospective zones for rock salt exploration in the study area, which has great prospecting significance in Yanyuan basin.
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CHEN Ting, YAN Di, YU Zhou, QU Chen, RAN Zhong-Yu, QIU Long-Jun. The interpretation and inference of gravity anomaly and the prediction of salt formation prospect in Yanyuan basin. Geophysical and Geochemical Exploration, 2020, 44(5): 1125-1134.
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