【摘要】 四川盆地及周边页岩气产量与压力系数存在明显的正相关关系。针对南川地区五峰组-龙马溪组地层压力预测过程中的难点,开展了井-震联合预测工作。以单井测井资料为基础,用实测数据作为约束,对比Eaton法和改进的Fillippone法压力预测结果,选择改进的Fillippone法为工区的压力预测模型并确定公式经验值。通过叠前同时反演获得高分辨率层速度数据,提高了压力预测精度。预测结果与实测对比,误差基本满足工程要求。预测目的层地层压力系数为0. 8～1. 6,工区西部、北部异常压力较大,连片特征较好,南部、东部趋于正常压力,可依据压力异常区来寻找有利钻探目标。更多还原

【Abstract】 There is a significant positive correlation between shale gas production and formation pressure coefficient in Sichuan Basin and its surrounding areas. For solving problem in formation pressure prediction of Wufeng formation-Longmaxi formation in Nanchuan Area,the formation pressure was predicted by well to seismic integration. Based on well logging data,by using the measured data as constraint condition,the formation pressure was calculated by Eaton method and improved Fillippone method. After results comparison,the improved Fillippone method was selected as prediction model and formula empirical value was established. Seismic interval velocity was obtained from high resolution pre-stack simultaneous inversion so as to improve accuracy. Compared with measured data,the errors met engineering requirement basically. It is predicted that the formation pressure coefficient of Wufeng formation-Longmaxi formation is between 0. 8 and 1. 6. The high pressure mostly distribute in the western and northern while the eastern and southern pressure are normal. The drilling target can be found according to the abnormal pressure area.更多还原