Carbonate Reservoir Fracture Prediction In Nanpu 2 Burial-hill

A great breakthrough has been made about the petroleum exploration of Nanpu burial-hill in 2004. LPN1 well got the industrial oil in Nanpu 2 burial-hill, which was the first discovery well. For the purpose of pushing on exploration and development, based on the existing problems, predict carbonate fracture in Nanpu 2 burial-hill.Nanpu sag is in northwest of Huanghua depression, which is a half graben. Nanpu sag has 5 burial-hill structural belts, which mainly distribute in south of Xinanzhuang fault and Gaoliu fault. Nanpu sag has preferable source, reservoir and seal situation. Nanpu 2 burial-hill is faulted-block ancient burial-hill. North-east and east-west base faults separate the burial-hill to 2 faulted-noselike structures. Nanpu 2 burial-hill is one of the most important exploration targets, of which exploration targets is Ordovician carbonate reservoir in top of the burial-hill. On the top of the burial-hill, it is easy to be weathered, leaching and cause good reservoir, which is good for the oil migration and accumulation.Based on wide azimuth seismic data, combined with existing drilling results, the seismic comprehensive prediction of Ordovician heterogeneous carbonate fracture-vuggy reservoir was conducted in the top of Nanpu 2 burial-hill. On the basis of seismic data relative maintaining amplitude processing, the surface layer shape and fracture pattern of Nanpu 2 burial-hill is implemented by fine structural interpretation. Pre-stack fracture prediction is using the P-wave azimuthal anisotropy analysis technique; post-stack fracture prediction is utilizing the curvature attribute technique; then post-stack karst cavern detection is supplemented by the attenuation gradient attribute. Through comparative analysis of the pre-stack and post-stack prediction results, and verification of the FMI imaging logging and drilling actual production, correctness of the research ideas and effectiveness of the prediction methods used have proved. The comprehensive prediction results provide a basis for delineating the favorable target areas of Ordovician carbonate reservoir in the Nanpu 2 burial-hill.