Application of multiwave joint inversion to the prediction of relatively high-quality reservoirs——an example from the prediction of deep tight clastic sandstone reservoirs in the western Sichuan Basin

Ye Tairan; Fu Shun; Lü Qibiao; Lai Weirong

doi:10.11743/ogg20090315

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Application of multiwave joint inversion to the prediction of relatively high-quality reservoirs——an example from the prediction of deep tight clastic sandstone reservoirs in the western Sichuan Basin
Vol. 30, Issue 3, Pages: 357-362(2009)
Online First：25 June 2009，

Published：2009
DOI： 10.11743/ogg20090315
稿件说明：

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DOI：

Ye Tairan, Fu Shun, Lü Qibiao, et al. Application of multiwave joint inversion to the prediction of relatively high-quality reservoirs——an example from the prediction of deep tight clastic sandstone reservoirs in the western Sichuan Basin[J]. 2009, 30(3): 357-362. DOI： 10.11743/ogg20090315.

摘要

川西深层上三叠统须家河组四段发育三角洲致密碎屑砂岩

砂体厚度大

但含气较好的相对优质储层厚度薄。相对优质储层与作为围岩的致密砂岩和泥岩波阻抗较为接近

利用常规地震方法很难预测该类优质储层分布

而且预测精度差。利用3D3C勘探优势

开展纵波及转换横波联合反演

在储层岩石物理参数敏感性分析基础上

采用"砂中找砂"的预测思路

优选泊松比、P波阻抗多波属性数据体

采用多体交会解释手段

剔除泥岩和致密砂岩

可较好地预测致密砂岩背景中相对优质储层的分布。

Abstract

Clastic sandstones of delta facies were developed in the fourth member of the Tertiary Xujiahe formation(T

) in the western Sichuan Basin and they are tight with low porosity and low permeability.The sandbodies are large in thickness

but their gas-bearing reservoirs are thin.The wave impedance of these reservoirs is similar to the surrounding rocks—tight sandstone and mudstone.It is very difficult to accurately predict the distribution of these reservoirs using conventional seismic methods.Taking advantages of 3D3C exploration

we have carried out a joint inversion of P-wave and converted shear wave.Based on the analysis of petrophysical parameter sensitivity

we have proposed the idea of "recognize quality sandstone in sandstone".The multiwave attribute data volume such as Poisson's ratio and P-wave impedance are selected for multi-volumes crossplot interpretation to recognize mudstone and tight sandstone.In this way the relatively high-quality reservoirs within tight sandstones can be accurately identified.