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四川盆地东部褶皱带的石炭二叠系构造不同于地表出露的侏罗系构造,其中背斜构造有规律地被冲断层分割为五个不同特征的块体。气藏通常分布在对冲的两个块体上。钻井进入其它块体就意味着失误或落入陷阱。由于在上覆较低速的碎屑岩层系与下伏较高速的碳酸盐岩系之间存在波的折射,按常规处理方法得到的地震资料不可避免地产生不允许的误差。在地震资料解释中对这种现象和构造模式缺乏认识,常常导致钻探陷阱。本文根据川东地区24个构造上166口石炭二叠系的钻井资料及大量的过井地震资料的分析,归纳为六种类型的陷阱,并相应地作出了初步分析。文中指出,按地震剖面本身的层状结构进行反演,可以减少钻探失误。
The Carboniferous Permian structure of the fold belt in the eastern Sichuan Basin is different from the Jurassic structure exposed on the surface. The anticline structure is regularly divided into five blocks with different characteristics by the thrust fault. Gas reservoirs are usually distributed on two blocks of hedges. Drilling into other blocks means mistakes or pitfalls. Due to the wave refraction between the clastic strata overlying the lower velocities and the lower-velocity carbonate rocks, imperfections in seismic data obtained by conventional methods inevitably result. Lack of awareness of this phenomenon and tectonic patterns in the interpretation of seismic data often leads to drilling pitfalls. Based on the analysis of 246 structurally Carboniferous Permian drilling data and a large number of over-the-hole seismic data in 24 structures in eastern Sichuan, this paper summarizes six types of traps and makes corresponding preliminary analyzes. The article pointed out that according to the seismic section of the layered structure of the inversion, drilling errors can be reduced.