| The Fangzheng fault depression which is a negative tectonic units lies in the middlenorth of the Yi-Shu grabe. It is a strike slip pull apart basin, the development of which iscontrolled by the east and west boundary fracture. Its complicated structural features appear incomplex fault system and deformation history and abundant structural styles. This articleresearch zone is ZuoShugang area located between the Fangxi fracture of the Fangzheng faultdepression and Yihantong fracture nearby fang1and fang5well, covering an area of about100square kilometers.Based on The Fangzheng fault depression basic geological data and the previous studiesthis text understand all of the overall structure characteristics and tectonic evolutional ofFangzheng fault depression. Then, utilizing3D seismic data, drilling reference, logginginformation and test analysis data of research area, the target layers precise interpretation iscarried out. The article comparison tracks T1、T2、T2-1、T3、T4、T5、Tgseven reflection layersand plots the corresponding seismic reflection structure picture and strata isopach map. T4andT5reflection layers correspond to the main target horizon Xinancun-Wuyun formation.According to fracture system analysis in research area, the main faults are Fangxi faultand Yihantong fault. Based on regional geological setting, seismic profile layers contactrelation, every interfaces structure pictures and strata isopach map I conclude Zuoshu areahave fault depression major tectonic evolution feature controlled by base fracture, and itexperienced strike slip pull apart, pressure and uplifting, stable settlement and strike-sliptranslation four stages.Finally, combining with the study of sedimentary facies, the wave impedance inversionand attribute analysis in target horizon Xinancun-Wuyun formation is realized. The predictingdepth map of the Xinancun-Wuyun formation is required. The conclusion is that sandstonemainly develops in the middle east of target area and the thickness is usually from20to30m. |
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