The Study On The Tectonic Evolution Of Daqing Changyuan

The new models,such as quantitative,three-dimensional,comprehensive,dynamic and simulation,are widely used in the study of the structures and their relationship with oil and gas accumulation in the petroliferous basin.New concepts,new frameworks and new sequences have constantly promoted the field of petroleum structure.The close relation between petroleum structure and petroleum geology is helpful to promote the rapid development of exploration.Among them,the new tectonic view plays an important guiding role in the study of oil and gas accumulation regularity,the geological tectonic setting of reservoir formation characteristics,as well as the potential exploration and development of old oil areas,new oil fields,new fields and new types of exploration.Daqing Changyuan(DQCY)is one of the secondary tectonic units in the central depression of Songliao Basin.Its oil production accounts for more than 90% of the total output of Daqing oilfield,so it is necessary to analyze the tectonic evolution of DQCY.However,DQCY has experienced complicated tectonic movements.The tectonic stress,formation mechanism and tectonic evolution in this area are debatable points that limited the exploration and the research work.Therefore,it is very important to analyze the structural geometric characteristics and structural evolution characteristics of DQCY.In order to get a better understanding of the structural characteristics in the DQCY,this study is based on the seismic profile and the previous research data,combined with the fundamental theories,such as basin-forming dynamics,structural geology and sedimentary geology.The faults system,structural style and structural evolution in the DQCY are in-deep analyzed though structural physical modeling which lay a solid and reliable foundation for the next step in oil and gas exploration.The structural geological understanding that is consistent with the actual regional tectonic deformation characteristics has been obtained,and the main knowledge is as follows:(1)The tectonic system of DQCY consists of NS Changyuan,NE partial structures,NE thrust faults,NW trending normal faults and NW fault blocks.It is a tectonic belt formed in the same compressional tectonic setting.It consists of several structures,each of which has different shapes,properties,grades,sequences and directions.In terms of spatial distribution,occurrence,development and mechanical mechanism,the structures of DQCY are inter related.(2)From the formation mechanism,combined with the simulation experiment of tectonic physics,we can draw a conclusion that the whole of DQCY,is a fault type positive inversion structure,and the subsidence center is formed during the fault depression period.The reverse phase is mainly characterized by positive structure,during the reversal stage,the thrusting activity along the first fault plane is achieved,thus shortening the amount of extrusion deformation.(3)By constructing the physical simulation experiment and combining the reality form,this paper holds that the overall shape of fault depression in the DQCY is NNE banded,this is because it is influenced by the NNE toutai-Heiyupao basement fault.Under the action of NW-SE compressive transpression,in addition,controlled by pre-existing faults,6 local structures have been developed on the plane of DQCY,and 4 nose structures have been developed on the west side.The relative eastern side of the structure is not obvious.