Study On The Electrical Structural Characteristic Of The Tianshan Orogenic Belt

Junggar Basin,Tarim Basin as the rich oil and gas resources and the key areas for future exploration and development of oil and gas,the Tianshan orogenic belt has experienced the evolution continental breakup,collision suture complex in the period of geological history.The study has great significance to tectonic on future development of oil and gas resources and the region to find out the evolution process.The papers relying on the project " Standard Continental Geo-Electromagnetic Net Experimentation(SinoProbe-01)" of "Deep Exploration Technology And Experimental Research(SinoProbe)",in view of the Tianshan orogenic belt and Junggar Basin,Tarim Basin in the north and south sides of it.Making using of precision magnetotelluric acquisition instrument and reasonable observation methods in data collection field.The application of advanced data processing and two-dimensional inversion technique.With a single standard for 2D inversion.Get Electrical conductivity structure model for several profiles.Then study on deep structure features of the Tianshan orogenic belt,Tarim Basin,Junggar basin,we get the following conclusion:The internal structure of the Junggar basin is relatively single,there is no large structural fault.There are low resistivity layers in near surface of the region.The following appeared the thickness of 20?30km high resistance layer.Then down the re emergence of a low resistance layer.There is a low resistivity layer near the surface of southern margin of the Tarim Basin.There is a layer of high resistance or high resistance body under the depth of 10?30km.The deeper position is a low resistance body.There are many large faults within the Tarim Basin,so the inversion results of standard point show vertical electrical gradient zones feature.Junggar basin and orogenic belt of Altai border area and the Tarim Basin and the Cherchen fault boundary region,due to the nearby presence of deep faults,the 2D inversion results show obvious vertical electrical gradient zones and the invasion features high resistance body wedge.The southern margin of the Tarim Basin,the Tarim Basin,Junggar Basin,The resistivity showed similar changes in the law.Shallow in low resistance,with the depth increasing resistivity,maximum value appears in the depth of 10?20km,to deep resistivity decreases again,to achieve a minimum value at about 40km,to continue to increase after deep.