2. Study area

The city of Yuxi studied in this paper is widely distributed in Cenozoic strata and is located in the central part of Yunnan Province. The geographical coordinates are between 23°19′~24°53′ north latitude and 101°16′~103°09′ east longitude. It is adjacent to Kunming City in the north, Pu'er City in the southwest, Honghe Hani and Yi Autonomous Prefecture in the southeast, and Chuxiong Yi Autonomous Prefecture in the northwest. The location is extremely important. In general, the site is located on the western edge of the Yunnan-Guizhou Plateau, with an average elevation of about 1800m. The terrain is high in the northwest and low in the southeast. Mountains, valleys, plateaus, and basins are staggered, and the terrain conditions are extremely complex. Taking the Honghe River as the demarcation line, the Hengduan Mountain in West Yunnan is to the west of the Honghe River, and the mountain body is northwestward. To the east of Honghe River is Yunnan Guizhou Plateau. The mountain trends are north-south, northwest, northeast and east-west extending to the south, and the mountain is broken. There are many reasons for the current topography of the Yuxi Basin. There is no doubt that the abnormal pressure of the formation has played a crucial role in the formation of the topography. In order to better develop the mineral resources in this area and form a clearer understanding of the causes of the terrain, the article analyzes the distribution and evolution characteristics of abnormal pressure in Yuxi Basin.