摘要
纵、横波速度是储层岩性、物性和流体识别的重要参数,而实际生产中往往缺乏横波速度资料,因此,开展横波速度预测已成为岩石物理研究的重要内容。目前横波预测中普遍使用的是Greenberg—Castagna经验公式,但其在塔里木盆地塔中地区ZG5-7井区应用效果不佳。针对上述问题,充分利用已钻井的纵波速度、地层密度、泥质含量、孔隙度、含水饱和度等常规测井资料以及岩石骨架和流体的各种弹性参数,构建了流体置换的Xu—White模型,用来求取横波速度。该区6口井的横波曲线拟合的实验结果表明:Xu—White模型预测的横波速度与实测横波速度高低趋势一致,其相关系数最高达到0.970 9,完全能满足横波弹性反演和油气预测的需要。结论认为,Xu—White模型不仅适用于碎屑岩储层的横波速度预测,同样在碳酸盐岩的横波速度预测中也能取得良好的应用效果。
The P-and S-wave velocity is one of the most important parameters in characterizing the lithogical and petrophysical properties of reservoirs and identifying the fluids in reservoirs.However,there is a lack of such data on the S-wave velocity in actual production.That is why the forecast of S-wave velocity has become the main content in rock's petrophysical studies.At present,the Greenberg-Castagna empirical formula is commonly used in the S-wave forecasting,but achieved bad results in the wellblock ZG5-7,Middle Tarim Basin.In view of this,making full use of regular logging data including the P-wave,formation density,mud content,porosity,and water saturation,etc.and all kinds of elastic parameters of rock skeleton and fluids,the fluid substitution Xu-White modeling is built for the calculation of S-wave velocity,The S-wave curve fitting results from the 6 wells in the wellblock ZG5-7 demonstrate that the forecasted S-wave velocity by use of the Xu-White modeling agrees well with the actual measurement with the correlation-R up to 0.9709,which can completely meet the need of elastic S-wave inversion and hydrocarbon forecasting.This model can be adopted in the S-wave velocity forecasting of clastic and carbonate rock reservoirs.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2012年第5期25-27,100,共3页
Natural Gas Industry
基金
四川省重点学科建设项目(编号:SZD0414)
