基于地震正演精细外推地层油气藏边界——以溱潼凹陷帅垛—陈家舍区带戴南组一段为例

发布时间：2018-04-02 08:50

本文选题：地震正演　切入点：地质模型　出处：《新疆石油地质》2017年04期

【摘要】：溱潼凹陷地层油气藏由于圈闭复杂,含油条带较窄,根据地震波反射特征追踪的地层尖灭线与实际地层尖灭线往往存在较大误差,导致钻探成功率不高。通过对地层不整合尖灭的地质模型正演得到地震模型,对比各种地震属性在识别地层油气藏边界中的优势与不足,优选出识别效果较好的平均波谷振幅属性和平均瞬时相位属性。对不同频率下一系列模型分析,得到不同频率、不同夹角(不整合面与地层夹角)的地层尖灭点与地震剖面上尖灭点间的误差,通过拟合建立不整合面和地层的夹角与地层尖灭点误差的函数关系,实现了夹角外推定量计算。综合利用地震属性半定量刻画与地震正演模型夹角外推定量计算,精细刻画地层圈闭的边界。
[Abstract]:Because of the complex trap and narrow oil-bearing belt in Qintong sag, there is often a large error between the formation pinning line tracked according to the reflection characteristics of seismic wave and the actual formation tip extinguishing line. As a result of the low success rate of drilling, seismic models are derived from geological models that are not in conformity with each other, and the advantages and disadvantages of various seismic attributes in identifying the boundary of formation oil and gas reservoirs are compared. The average trough amplitude attribute and the average instantaneous phase attribute are selected, and a series of models are analyzed at different frequencies, and different frequencies are obtained. By fitting the error between the tip out point of the formation and the point of the seismic profile, the functional relationship between the angle of the unconformity surface and the angle of the stratum and the error of the tip out point of the formation is established by fitting the error between the tip out point of the formation and the angle between the unconformable surface and the stratum. The quantitative calculation of angle extrapolation is realized and the boundary of stratigraphic traps is accurately delineated by synthetically using the semi-quantitative characterization of seismic attributes and the quantitative calculation of angle extrapolation of seismic forward model.
【作者单位】：长江大学地球物理与石油资源学院;
【基金】：中国石化科技项目(34600000-16-ZC0607-0001)
【分类号】：P618.13

【相似文献】