Prediction technology and effectiveness for temperature of granite inner reservoirs:a case study of hot dry rock in Gonghe Basin
Indosinian granite in Gonghe Basin,Qinghai Province is a favorable hot dry rock resource.How-ever,the seismic reflection inside the granite is disordered and highly heterogeneous.At present,the tempera-ture prediction method based on seismic data is rare,which restricts the development of hot dry rock resources.Therefore,the temperature prediction technology for granite inner reservoirs was proposed.The seismic data of different frequency bands were reconstructed,and the dominant frequency band(10～20 Hz)with good lateral reflection continuity inside the granite was optimized for tectonic interpretation.Combined with the longi-tudinal variation characteristics of lithology and electrical properties,the interior of granite was divided into four layers.According to the laboratory results,the relationship between temperature and seismic velocity was es-tablished by using well logging data,and then high-precision longitudinal wave velocity inversion was carried out to predict the spatial variation of temperature.This method has achieved good results in Gonghe Basin and can provide a reference for similar areas.
hot dry rockdominant frequency bandtemperature predictionGonghe Basininterior of granite
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