Integrated modeling technology for complex fault belt in Qaidam Basin
Zhang Ju-mei1,4, Cao Zheng-lin1, Zhang Dao-wei2, Qi Jia-fu3, Pei Ming-li1
1. Northwest Branch,Research Institute of Petroleum Exploration & Development,PetroChina, Lanzhou, Gansu, 730020, China;
2. Qinghai Oilfield Branch Company,PetroChina, Dunhuang, Gansu, 736202, China;
3. China University of Petroleum(Beijing), Beijing, 102249, China
Abstract：Located in the east of Yingxiongling fault-fold belt,Yingdong area is the place with most developed surface structures of Qaidam Basin.Because of complex in both the surface and underground geological structures,quality of seismic data in Yingdong area is relatively poor,leading more difficulties in structure determination.Started from geological outcrops,drilling and tectonic evolution,an interpretation model of double structures(decollement in the shallow and block-faulting in the deep) has been established by "integrated geological modeling technology" in this paper.Then,on the basis of synthetic seismogram combined with velocity analysis,horizons have been calibrated by integrated calibration method of multi wells and multi levels.Finally,combination relations among fault systems of two stages and affection of later faults towards structures have been discussed according to generation mechanism.Based on newly interpreted results,Well S37 has been deployed in Yingdong area,with abundant oil/gas show,indicating a relatively bright application future of "integrated geological modeling technology" in seismic interpretation of complex area.
