Abstract:The Carboniferous-Permian structure in east-Sichuan fold belt is different from the cropped Jurassic structure.Anticlinal structure was regularly cut into five different fault blocks by overthrust faults.Gas pools are usually in overthrust block and downthrust block.Drilling into other blocks means failure or dropping into a pitfall.The seismic data after the conventional processing usually has nonnegligible error because there is refraction between the low-velocity overlying clasticrock series and the high-velocity underlying carbonate-rock series.No understanding of both the refraction and the structural pattern in seismic interpretation often causes a drilling pitfall.Six kinds of pitfall were known after the overall analysis of seismic sections across wells and the drilling data of 166 wells that penetrate Carboniferous-Permian systems on 24 structures in east Sichuan,and the pitfalls are analysed respectively.Drilling failure can be reduced by making the inversion of actual seismic horizons on seismic sections.
收稿日期: 1988-04-22
引用本文:
徐中英. 川东地区石炭二叠系的构造模式与钻探陷阱[J]. 石油地球物理勘探, 1988, 23(6): 676-683.
Xu Zhongying. The structural pattern in Carboniferous-Permian systems in east Sichuan and the drilling pitfall. OGP, 1988, 23(6): 676-683.