基于Pride岩石骨架模型的横波孔隙度计算方法  

A method for calculating S-wave porosity based on Pride rock frame model

作　　者：李志愿 LI Zhiyuan(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《中国海上油气》2020年第6期64-69,共6页China Offshore Oil and Gas

基　　金：中海石油(中国)有限公司综合科研项目“渤海油田3000万吨持续稳产关键技术研究(编号:CNOOC-KJ135-ZDXM36-TJ-03)”部分研究成果。

摘　　要：岩石的横波时差受孔隙中流体的影响较小,并且每单位孔隙度变化引起的横波时差变化比纵波大,因此利用横波时差评价储层岩石的孔隙度更具优势。本文以Pride岩石骨架模型为基础,结合Biot-Gassmann理论以及岩石体积物理模型,建立了一种新的横波孔隙度计算方法。通过在关键井中采用最优化方法反演Pride岩石骨架模型中所需的骨架横波时差和固结系数2个参数,提高了横波孔隙度计算方法的可行性和准确性。该方法在中低孔隙度储层的应用中取得了很好的效果,对实际生产具有较高的指导作用。The S-wave time difference of rock is less affected by the fluid in the pore,and the change of S-wave time difference caused by the change of porosity per unit is larger than that of P-wave time difference,so it is more advantageous to evaluate the porosity of reservoir rock by using the S-wave time difference.Based on the Pride rock frame model,combined with the Biot-Gassmann theory and rock bulk physical model,a new method for calculating the S-wave porosity is established in this paper.The feasibility and accuracy of the method are improved by using optimization method to invert the S-wave time difference of matrix and consolidation coefficient required in pride rock frame model in key wells.The method has achieved great results in the application of low and medium porosity reservoirs,and played a high guiding role in actual production.

关 键 词：Pride模型 横波孔隙度 参数反演 固结系数 骨架横波时差 

分 类 号：TE132.14[石油与天然气工程—油气勘探]