叠前弹性波阻抗反演在四川FL地区礁滩型储层预测中的应用

Application of Prediction of Pre-stack Elastic Impedance Inversion in Reef-shoal Reservoir at FL Area,Sichuan Basin

叠前弹性波阻抗反演对礁滩型储层的预测和流体识别较叠后声阻抗反演的可信度更高,可对含油气性进行半定量—定量描述。以四川FL地区礁滩型储层为重点,以叠前弹性波阻抗反演为技术路线,对该地区反演出的数据体进行交汇解释,预测出了该区礁滩型储层的平面分布特点,预测结果与该区仅有的两口钻井资料相吻合。实践表明,用交会法并结合对储层响应敏感的两个参数泊松比和剪切模量进行储层解释,可靠度较高。

Though reef-shoal reservoirs have become increasingly important targets for gas exploration, the methods of the prediction of them and the identification of fluids in them are still in the probing stage. Comparing with post- stack acoustic impedance, the pre-stack elastic impedance can be more reliable in quantitative-semiquatitative petroliferous evaluation because of data-based multi-parameter analysis. This method has been applied in the pre- diction of reef-shoal reservoir in FL area where intersection interpretation is also used after. The result has shown that the reef-shoal reservoir in FL area is characteristic of plane distribution, which is accorded with the data from only two boreholes. It is indicated that it is more reliable to predicate reef-shoal reservoirs by the intersection inter- pretation combining with Poisson ratio and shear module.