Lithology Identification And Mapping Test Of Shallow Overly Area In Jining,inner Mongolia

The shallow overly area is large in China and widely distributed,with huge potential in prospecting resources.It is particularly urgent to put effort in researching shallow overly area in today's resource shortage.This shallow overly area in Jining is located in the northern margin of the north China craton,and is located at the junction of the Inner Mongolia suture zone and the orogenic epoch in the central part of north China.The tectonic activity is more intense,many faults are developed,and many large mineral deposits have been found in the study area.More than 80% of the surface area here is covered by tertiary,quaternary and neogene sediments.The geophysical method with "penetrability" can overcome the shading effect of overburden and study the lithology mapping under the overburden so as to provide a basis for the subsequent prospecting work.Geophysical gravity and magnetic three-dimensional inversion technology can well identify the underground information and reflect the deep structure.Based on the constructed lithology-physical relationship,the vertical lithologic mapping can be realized and a distribution model of underground rock can be established.In this paper,Preferential filtering method was choosen to "stripping" the influence of the shallow overly layer in this area.Then I used boundary identification method to interpreted the detail information and made lithologic mapping under the overly layer.And the result is the interpreting of 19 hidden rocks and 18 hidden faults.Based on the rock information,the lithology-density and magnetic susceptibility topological relationship was established,and the three-dimensional inversion results in this area were divided into the same grid.The east-west section at4515 km in the north direction in this area was identified for lithology.The underground lithology distribution of this part was preliminarily inferred.Based on theabove results,the ore-prospecting markers in the research area are summarized.