油气藏评价与开发 >
2022 , Vol. 12 >Issue 6: 910 - 917
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2022.06.010
JI-FI反演技术在薄砂岩储层预测中的应用——以XH地区K1bs3上部储层为例
收稿日期: 2021-08-04
网络出版日期: 2022-12-02
Application of JI-FI inversion technology to prediction of thin sandstone reservoir: A case study of K1bs 3 upper thin sandstone reservoir in XH area
Received date: 2021-08-04
Online published: 2022-12-02
XH地区K1bs3上部发育的三角洲前缘薄砂岩储层是构造—岩性油气藏勘探的重要领域。近年来在该区应用常规波阻抗、叠前确定性反演都无法准确预测目的层薄砂岩储层的分布。应用JI-FI(阻抗与相联合反演技术),利用叠前地震道集数据,在不同岩相/流体相的纵波、横波速度和密度深度趋势约束下,将同时反演与贝叶斯分类相结合,采用最大期望算法,对阻抗和相进行迭代,实现了目标区岩相/流体相及岩石物理性质(纵波阻抗、横波阻抗、密度及纵横波速度比等)的定量预测。该方法克服了常规叠前反演依赖井建立低频模型,特别是在井少、薄互层地质条件下,井间波阻抗内插存在不确定性问题。储层预测结果与井吻合度高,为该区岩性勘探及井位部署提供了依据。
梁宏刚 , 邓锋 , 马洪涛 , 孙力 , 丁辉 , 杨俊英 . JI-FI反演技术在薄砂岩储层预测中的应用——以XH地区K1bs3上部储层为例[J]. 油气藏评价与开发, 2022 , 12(6) : 910 -917 . DOI: 10.13809/j.cnki.cn32-1825/te.2022.06.010
The thin sandstone reservoir in the delta front developed in the upper part of the K1bs3 formation is an important area for the exploration of structural-lithological oil and gas reservoirs in the XH area. In recent years, Application of P-impedance and pre-stack deterministic inversion could not accurately predict the distribution of thin sandstone reservoirs in the target layer. In this paper, joint impedance and facies inversion(JI-FI) impedance and facies joint inversion technology is used. This technique uses pre-stack seismic gather data, and combines simultaneous inversion and Bayesian classification under the constraints of the P-wave, S-wave velocity and density depth trend of each lithofacies or fluid facies, the maximum expectation algorithm is used to iterate the impedance and facies, and the quantitative prediction of lithofacies/fluid facies and petrophysical properties (such as P-wave, shear wave impedance, density, Vp/Vs, etc.) in the target area is achieved. This method overcomes the uncertainty of inter-well P-impedance interpolation when conventional pre-stack inversion relies on wells to establish low-frequency models, especially under geological conditions with few wells and thin interbeds. The reservoir prediction results are in good agreement with the well, which provides a basis for lithological exploration and well location deployment in this area.
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