基于微分孔弹性理论的异质储层孔隙结构估算

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Jing Ba, Zhijiang Ai, José M. Carcione, Mengqiang Pang, Xinfei Yan, Xiao Chen
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引用次数: 0

摘要

异质储层复杂的地震响应与原位岩石的结构、孔隙/微裂缝形状、矿物成分和流体分布有关。孔隙结构是指孔隙、微裂缝和节理的几何形状、大小、空间分布和相互联系。它与储层的存储空间和油气的空间分布密切相关。了解孔隙结构对于开发提高石油/天然气生产能力的工艺至关重要。我们从高石梯-莫西龙王庙地层中挑选了六个白云岩样品进行测量,并分别采用频谱比值法和增强频移法测定了超声衰减和地震衰减。在预测孔隙结构时,我们假设孔隙和微裂缝的长径比和体积分数符合正态分布。在此基础上,我们提出了一个包含 Voigt-Reuss-Hill 平均(VRH)、微分有效介质(DEM)理论和无穷多孔介质(IPM)理论的模型。分析了储层孔隙度和正态分布标准偏差的声波响应,并创建了多尺度三维岩石物理模板(RPT)。利用超声波和地震数据对模板进行校准,然后将模板应用于现场数据。结果表明,估计的孔隙度和孔隙结构(分别对应于正态分布的平均纵横比和标准偏差)与测井数据和实际产气结果基本一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Estimation of Pore Structure for Heterogeneous Reservoirs Based on the Theory of Differential Poroelasticity

Estimation of Pore Structure for Heterogeneous Reservoirs Based on the Theory of Differential Poroelasticity

Estimation of Pore Structure for Heterogeneous Reservoirs Based on the Theory of Differential Poroelasticity

The complex seismic responses of heterogeneous reservoirs can be related to the fabric structure, pore/microcrack shape, mineral composition and fluid distribution of the rock in situ. The pore structure refers to the geometric shape, size, spatial distribution and interconnectedness of pores, microcracks and throats. It is closely related to the storage space of reservoirs and the spatial distribution of oil/gas. Understanding the pore structure is crucial for the development of processes to increase oil/gas production capacity. Six dolomite samples from the Gaoshiti-Moxi Longwangmiao Formation are sorted out for measurements, and the ultrasonic and seismic attenuation are determined by using the spectral ratio method and the enhanced frequency shift method, respectively. When predicting the pore structure, we assume that the aspect ratio and volume fraction of pores and microcracks correspond to a normal distribution. On this basis, a model with the Voigt–Reuss–Hill average (VRH), differential effective medium (DEM) theory and infinituple-porosity media (IPM) theory is proposed. The acoustic wave responses in terms of reservoir porosity and standard deviation of normal distribution are analyzed, and multiscale 3D rock physics templates (RPT) are created. The calibrations of the templates are performed with the ultrasonic and seismic data, and then the templates are applied to the field data. The results show that the estimated porosity and pore structure (corresponding to the mean aspect ratio and standard deviation of a normal distribution, respectively) are in substantial agreement with the log data and the actual gas production results.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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