Research On Geophysical Interpretation Of Sedimentary Geothermal Resources In Syncline Basin

Among the earth's many resources,geothermal resources have a long history and huge reserves.The total thermal energy in the earth is about 170 million times that of the global coal reserves,among which about 100 billion barrels of oil are burned every year and the heat is dissipated from the earth's interior through the surface Geothermal resources are clean,renewable and widely distributed.The demand for geothermal resources in today's society is increasing year by year,and the development prospect of geothermal resources is more and more broad.Geothermal resources are buried deep,and geophysical exploration technology plays an important role in geothermal resources exploration,but there are still many problems.Improving the precision and efficiency of geophysical methods is of great practical significance for geothermal resource research.The cap,reservoir,heat source and channel of different geothermal resources are different.Based on this understanding,we carry out forward modeling of geophysical field for different geothermal geological models.By using forward modeling,the apparent resistivity of Kaniatector and dc field is obtained to form a quasi-sectional view.The distribution of geophysical fields in different geothermal geological models is analyzed.Based on the analysis,it is concluded that the quasi-section of the apparent resistivity and the apparent resistivity of the direct current electric field can not clearly reflect the real geological structure of geothermal resources,but the general shape of the geological structure can be preliminarily determined,so as to find a general direction for the later interpretation.In order to obtain the real geological structure of geothermal resources,the theoretical data obtained by forward modeling were used for inversion,and the underground true resistivity was obtained.Whether it is the Neogene-Paleogene clastic thermal reservoir type or the Ordovician limestone thermal reservoir type,the 2D inversion profile can well reflect the real geological structure and provide a real,effective and reliable judgment basis for geophysical interpretation.The feasibility of this method is verified by geophysical interpretation of sedimentary geothermal in Shandong Peninsula.The results show that the geophysical interpretation method in this paper has basically identified the stratigraphic structure of the target area,including the spatial distribution of basement fluctuation and concealed faults.In addition,the buried depth of the thermal reservoir and the possible enrichment zone of the geothermal fluid were determined,which achieved the exploration purpose,proving that the geophysical interpretation method studied in this paper has strong practicability in the exploration of sedimentary geothermal resources in syncline basin.In this paper,a geophysical interpretation method for sedimentary geothermal resources with different types of thermal reservoirs in syncline basin is theoretically realized.This paper studies a set of effective geophysical interpretation methods for sedimentary geothermal resources in syncline basin,and verifies the practicability of the translation method through its application in Zibo area of Shandong,so as to provide guidance for the development and utilization of sedimentary geothermal resources in syncline basin.