【摘要】 库车坳陷异常压力发育,但成因机制复杂,膏泥岩段中的超压主要以欠压实为主,白垩系地层中的超压以构造成因为主。传统的速度资料对钻井揭示的超压几乎没有明显响应,仅应用波阻抗反演不能对该区超压带的横向分布范围进行准确描述。为此,依据前人的实验研究结果,对库车坳陷超压分布范围的预测方法进行了探讨。对库车坳陷的超压和速度特征进行了分析,并论述了基于地震属性进行超压预测的依据；在此基础上,利用井约束反演的波阻抗与瞬时频率联合对库车坳陷阳霞凹陷内的超压带进行了预测。利用该联合预测方法在阳霞凹陷库1井井区不仅预测出3个超压带,而且在纵向上和横向上非常清晰地描述了这3个超压带的分布特征。预测结果与库1井的DST(钻杆测试)压力测试结果十分吻合。更多还原

【Abstract】 Abnormal pressure is well developed in Kuche depression,but its forming mechanism is complex.The overpressure in cream- mudstone interval is mainly the undercompacted origin while the o- verpressure in Cretaceous is mainly the tectonic origin.The tradi- tional velocity data has no any obvious response to the overpressure revealed by drilling and the acoustic impedance cannot accurately describe the lateral distribution scale of overpressure zone in this area.Therefore,on the basis of former experimental results,the prediction methods for overpressure distribution features in Kuche depression are researched,the overpressure and velocity features in Kuche depression analyzed,and the criteria of overpressure predic- tion based on seismic properties discussed.On the basis of this,the well restrained inverse acoustic impedance and instantaneous fre quency are jointly used to predict the overpressure of Yangxia sag, Kuche depression.By using this joint prediction method,three o- verpressure zones are predicted in Kul well field of Yangxia sag with the patterns of these overpressure zones being clearly de- scribed both vertically and horizontally.The prediction results are in good accordance with the DST pressure test results of well Kul.更多还原