宽带约束反演在江陵凹陷谢凤桥油田储层预测中的应用
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摘要
宽带约束反演是利用测井信息的纵向高分辨率和地震资料的横向连续性得到高分辨率的宽带波阻抗和速度模型 ,进行油气藏横向预测的一种方法。通过对声波测井的综合校正和制作合成记录先进行层位标定 ,继而对剖面精细解释 ,按解释剖面形成宏观模型 ,完成地层层位的数字化 ;然后采用井旁三道平均振幅值作为井旁模型地震道提取长度为 10 0ms的子波和 1ms的采样率进行随机地震反演 ,在此基础上便可对储层进行预测。预测认为 ,新沟咀组下段—沙市组有O3 和O4 两层主力含油砂层 ,经横向追踪 ,圈定了O3 和O4 含油砂层的平面展布范围 ,通过与构造圈闭叠合 ,确定O4 砂层面积为 7km2 ,经钻井获得自喷油流 ,证明预测结果具较高的准确性
Wide band constrained inversion is to use the vertical high resolution of log data and the lateral continuity of seismic data to predict reservoir laterally.At first,acousit log is used in horizontal calibration;then stratigraphic horizon should be digitized;finally,use average amplitude of three seismic traces of well site to extract 100 ms wavelet,make random seismic inversion and reservoir prediction.This method is used in the prediction of Xiefengqiao Oilfield reservoir.The resoult indicates that the lower part of the Xingouzui Formation Shashi Formation contain two major oil bearing sandsO 3 and O 4.Then stack the oil bearing sands with structural traps,the O 4 sand covers an area of 7 km 2,a flowing oil well was drilled in it,indicating that the prediction result is accurate.
Wide band constrained inversion is to use the vertical high resolution of log data and the lateral continuity of seismic data to predict reservoir laterally.At first,acousit log is used in horizontal calibration;then stratigraphic horizon should be digitized;finally,use average amplitude of three seismic traces of well site to extract 100 ms wavelet,make random seismic inversion and reservoir prediction.This method is used in the prediction of Xiefengqiao Oilfield reservoir.The resoult indicates that the lower part of the Xingouzui Formation Shashi Formation contain two major oil bearing sandsO 3 and O 4.Then stack the oil bearing sands with structural traps,the O 4 sand covers an area of 7 km 2,a flowing oil well was drilled in it,indicating that the prediction result is accurate.
引文
1 周竹生宽带约束反演方法[J]石油地球物理勘探,1993,28(5):523～536
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