四川盆地龙马溪组页岩气储层各向异性岩石物理建模及应用（英文）

发布时间：2018-01-11 20:04

本文关键词：四川盆地龙马溪组页岩气储层各向异性岩石物理建模及应用（英文）　出处：《Applied Geophysics》2017年01期 　论文类型：期刊论文

【摘要】：不同类型的页岩,微观物性特征差异明显,本文针对四川盆地龙马溪组页岩气储层进行岩石物理建模及VTI各向异性参数反演。首先,基于前人对粘土矿物的定向排列是产生页岩固有各向异性主要原因这一地质认识,在岩石物理建模过程中引入粘土矿物压实指数CL参数描述粘土矿物的弹性各向异性。之后,基于岩石物理模型开发反演算法,计算页岩储层CL参数及Thomsen各向异性参数,解决了由于无法测得与井壁垂直方向上的声波速度,各向异性直接测量存在困难的问题。计算结果表明,通过在岩石物理建模中引入粘土压实参数,反演方法能够合理估计龙马溪页岩储层的弹性各向异性,反映了龙马溪页岩的微观物性特征。进一步分析发现,龙马溪页岩中粘土含量与参数CL相关性较弱,表明粘土矿物的多少对其压实或各向异性程度影响较小。同时,参数CL在目标层龙马溪组底部和五峰组具有高异常值,反映了储层微观结构与含油气特征具有关联性。最后,基于模型构建了岩石物理模板,可用于储层测井数据与多物性参数关系的定量解释。测井数据在岩石物理模板上的合理分布也验证了岩石物理建模方法的有效性。
[Abstract]:Different types of shale have different microphysical properties. In this paper, rock physical modeling and VTI anisotropy parameter inversion for the shale gas reservoir of Longmaxi formation in Sichuan Basin are carried out. Based on the previous geological understanding that the directional arrangement of clay minerals is the main reason for the inherent anisotropy of shale. The clay mineral compaction index CL parameter is introduced to describe the elastic anisotropy of clay minerals in the process of rock physical modeling. Then the inversion algorithm is developed based on the rock physical model. The CL parameters and Thomsen anisotropy parameters of shale reservoir are calculated to solve the acoustic velocity which can not be measured in the vertical direction of the well wall. The calculation results show that the inversion method can reasonably estimate the elastic anisotropy of Longmaxi shale reservoir by introducing clay compaction parameters into rock physical modeling. Further analysis shows that the clay content in Longmaxi shale has a weak correlation with the parameter CL. The results show that the amount of clay minerals has little effect on the compaction or anisotropy. Meanwhile, the parameter CL has high abnormal values at the bottom of Longmaxi formation and Wufeng formation. It reflects the correlation between reservoir microstructure and petroliferous characteristics. Finally, the physical template of rock is constructed based on the model. It can be used for quantitative interpretation of the relationship between reservoir logging data and multi-physical parameters, and the reasonable distribution of logging data on rock physical templates also verifies the validity of rock physical modeling method.
【作者单位】：页岩油气富集机理与有效开发国家重点实验室;中国石化页岩油气勘探开发重点实验室;中国石化石油勘探开发研究院;吉林大学;
【基金】：supported by the Foundation of State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development(No.G5800-16-ZS-KFZY002) the NSFC and Sino PEC Joint Key Project(No.U1663207) the National Natural Science Foundation of China(No.41404090)
【分类号】：P618.13
【正文快照】： Introductionand Nur,1992).Based on the early rock physics studies of the Bakkenshale in North America(Vernik and Nur,1992;Vernik,The complex microstructure and reservoir properties of1994;Vernik and Liu,1997),Carcione(2000)studiedshales require the appli

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