Study On Thermal Character Since Cenozoic In Fangzheng Fault Depression

Thermal evolution history of the basin control generation,migration,accumulation and reservoir formation of oil and gas,analysis thermal evolution history of the basin have an important significance.Based on the comprehensive utilization of geological and geochemical data,have a research on the geothermal field and ancient temperature scale of Fangzheng’s Rift.Apply vitrinite reflectance,clay minerals,Tmax and other ancient temperature scale, use Thermodel for Windows 2008 software,combined with the structure and burial history of Fangzheng rift,recover the thermal history of the basin evolution.The plane distribution a nd the formation thickness distribution chart of single well facies and sedimentary facies show that the heat transfer medium in the village of Xin’an-Wuyun-Dalian river Formation during the deposition of Fangdong area is conglomerate,in the Fangxi area is mudstone.In the deposition period of Baoquanling formation Fangxi area developed the sandstone and conglomerate mainly,while Fangdong area developed mudstone and sandstone mainly.In the Neogene,the east and the west area developed sandstone mainly,and the development of conglomerate is relatively less.Since the start of the Wuyun formation the northern part of the Fangdong basin has experienced two times of deposition and erosion,the missing stratum and erosion of the Dalian river and Baoquanling group fro m north to South has gradually decreased.Fangxi basin began to deposit from the Wuyun formation,at the end of Wuyun formation,the deposition rate reached the maximum,and in the Xin’an village formation began to uplift and denudation,since Baoquanling forma tion in Fujin group has experienced a subsidence and uplift.From the north to south,the deposition rate of the ancient and the new age is gradually decreased,and the sedimentation rate is basically unchanged.Wuyun formation,Xin’an village and Darien River group geothermal field distribution in the north central part of the workspace,and from southwest to northeast direction temperature showed an increasing trend.Two regional temperatures are the highest.In the middle of Baoquanling formation geothermal field mainly concentrated in the middle of work area,d ivided into three parts of east,west and north.the temperature field of C huandishan group,Fujin formation appears in the north.There are two points the highest temperature.The sudden increase of heat flux in the Cenozoic is caused by the magmatic activity in the basin.Yihantong fracture area to the east Fangzheng rift,Ro-depth fitting line deflected in Baoquanling formation while the Ro-depth fitting line deflected in Dalianhe group of the west area,earlier than the east area is due to the sudden increase in deposition rate.At the junction of Baoquanling group a nd Dalianhe Formation,Paleogene,Neogene,Q uaternary and third lines,the heat flux changed significantly.