特色构造解释及储层预测技术在川西北双鱼石地区的应用

Characteristic structural interpretation and reservoir prediction in Shuangyushi Area,Northwest Sichuan

川西北双鱼石地区下二叠统栖霞组发育台缘滩相沉积的白云岩储层,形成构造—岩性复合圈闭气藏。研究区位于龙门山前冲断带,断层发育,落实难度较大。由于目的层埋深较大、储层厚度较薄,导致储层识别难度较大。为此,运用GeoEast解释系统的构造导向滤波技术、基于特征结构的相干技术识别断层,开展精细构造解释,采用古地貌分析技术指导栖霞组台缘相带刻画,最后采用属性敏感分析技术及地震反演技术开展储层定性和定量预测,优选储层发育有利区,为该地区后续勘探开发提供有力的技术支撑。

A group of carbonate rock dolomite reservoirs of Lower Permian Qixia Formation in the Beiyushi Area,Northwest Sichuan Basin are lithologic tectonic-lithologic composite-trap gas reservoirs.The reservoirs are jointly controlled by sedimentary facies and dolomite.Our study area is located in the front of the Longmen Mountain fault zones,which is characterized by well-developed faults,thin beds,deeply buried targets,and unclear seismic responses.It is very difficult to identify this kind of reservoirs.To overcome the problems,we conduct the research with interpretation tools provided by GeoEast System.Faults are identified with structure-oriented filtering and coherence attribute.The Qixia group platform-marginal facies is characterized with the paleo-geomorphology analysis.The qualitative and quantitative reservoir predictions are carried out with attribute sensitivity analysis and seismic inversion,which will provide favorable zones for the subsequent exploration and development in the area.