叠前弹性波阻抗反演在储层预测中的应用

Applying pre-stack elastic wave impedance inversion in reservoir prediction

叠前弹性波阻抗反演被认为是寻找岩性、地层等隐蔽性油气藏的有利技术,综合利用测井纵横波、密度、地震叠前道集等资料反演出与岩性、物性、含油气性有关的弹性参数,用于判别与指示有利储层。以柴达木盆地扎哈泉地区X区块为例,应用叠前弹性波阻抗反演技术针对该区进行储层预测。首先从反演基础数据准备角度出发,阐述了测井横波正演、地震叠前道集数据处理在参与反演过程中的必要性;其次运用该技术预测了X区块有利砂体的平面分布,并且根据预测结果后续部署两口井全部获得工业油流;最后认为叠前波阻抗反演技术在该区进行储层预测具有可行性。

Prestack elastic impedance inversion is considered a favorable technology to be search for lithologic and stratigraphic reservoirs.Comprehensive utilization logging P-wave,S-wave,density,seismic prestack data inversion elastic parameters related with lithology,petrophysics,oil and gas bearing feature to discriminate and indicate favorable reservoirs.Taking the X block of Zahaquan area of Qaidam Basin as an example,applying prestack elastic impedance inversion technique for reservoir prediction in this area.First,from the perspective of basic data for inversion,described S-wave forward,seismic prestack data processing is necessary in the inversion process;Secondly,using this technique have predicted favorable sand body distribution of X block and according to the prediction results subsequent deploymented two wells which obtain industrial oil flow;Finally,we considered that prestack impedance inversion techniques for reservoir prediction is feasible in this area.