Study On Structural Styles Of Tuha Basin In Northern Piedmont Region With The Eastern

The exploration practice at home and abroad proves that the oil and gas fields are abundant,the fault is well developed and the reservoirs are in good condition.The oil and gas fields have been found to be large in scale,and the daily output of single wells is high,which is favorable target area for oil and gas exploration.The Turpan Depression is the main battlefield of the oil and gas exploration in the Tuha basin,and the Taipei depression is the most important zone in the depression.The northern piedmont belt is 25% of the total area of the Taipei depression.With the degree of exploration,Tuha basin piedmont complex structure with Tuha Oilfield become a hot spot of exploration in recent years.In the eastern part of the northern hilly area of the Tuha basin,the surface conditions are complex and diverse,the underground structure is complex and affected by the geological and surface conditions.The quality of the original seismic data in this area is poor,especially the strata of the structural strata,difficulty in imaging is very difficult,so that the underground structure can not be accurately implemented.In this paper,we make full use of geological outcrops,drilling logs,earthquakes and other basic data,geological data and seismic data to establish regional stratigraphic framework.A total of several initial structural geologic models in the northern piedmont zone were established from west to east.On the basis of this model,the model is used to form a relatively reasonable structural geological model,and further implement the fault characteristics and stratigraphic distribution.To carry out two three-dimensional joint interpretation,further clarify the characteristics of the distribution of the region.through the horizon calibration,regional stratigraphy and other methods of piedmont area with fine structural interpretation.To complete the main purpose layer structure mapping work,and further clarify the characteristics of the region's structural distribution.Based on the structural model,the factors of hydrocarbon accumulation are analyzed,and the main controlling factors of the piedmont zone are analyzed.The main factors of reservoir formation are analyzed,and a number of favorable traps are found and implemented.To further implement the piedmont with oil and gas zone.For the next exploration and development to provide reference.Research indicates:(1)The study area in the early Yanshan period by Bogda mountain fold back,piedmont belt began to form a break,late Yanshan period of further development,the final shape of the mountain.(2)The northern part of the mountain piedmont is mainly developed in two groups of faults,One is the northwest westward,northeastern eastward thrust fracture developed by the north-south thrusting force,and the other is the regulating fracture formed by the difference of the north-south extrusion stress.(3)According to the deformation mechanism,the Tuha Bogda thrust system can be divided into "four tectonic deformation zone",from north to south development of northern orogenic belt and piedmont concealed zone,central uplift fold deformation zone,southern slippage deformation zone.