基于核磁共振T2分布的致密砂岩储层中束缚水饱和度测定新方法,Energy & Fuels

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基于核磁共振T2分布的致密砂岩储层中束缚水饱和度测定新方法
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-09-13 , DOI: 10.1021/acs.energyfuels.2c02507
Jilong Liu ₁ , Ranhong Xie ₁ , Jiangfeng Guo ₁ , Hongyuan Wei ₁ , Wenshuai Fan ₁ , Guowen Jin ₁

Affiliation

影响储层产能的束缚水饱和度是致密砂岩储层的关键参数之一。核磁共振（NMR）测井是检测地层中含有氢核的孔隙流体的弛豫信息，由于其弛豫信息不同，可用于区分束缚流体和可动流体。常规油藏中束缚水饱和度可采用T ₂截止法确定。但致密砂岩储层孔隙结构复杂，不同孔隙流体的弛豫信号在T ₂分布中可能重叠。T ₂ _在致密砂岩储层中，确定束缚水饱和度的截止方法可能是一个挑战。在这项研究中，提出了一种新的基于T ₂分布的方法，采用薄膜模型假设来确定致密砂岩储层中的束缚水饱和度。通过连续小波变换对T ₂分布进行变换，得到小波系数的二维矩阵，确定了小波空间中不同尺度谱峰的位置和形状参数。这些参数用于构建不同尺度的高斯分布函数 (GDF)。T ₂ _在构建的 GDF 的基础上对分布进行分解，然后选择最优分解。束缚水饱和度由分解后的最优T _{2分布决定。}通过数值模拟、岩心实验和核磁共振测井资料处理验证了所提方法的有效性和实用性。

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Novel Method for Determining Irreducible Water Saturation in a Tight Sandstone Reservoir Based on the Nuclear Magnetic Resonance T2 Distribution

Irreducible water saturation, affecting the productivity of a reservoir, is one of the key parameters for a tight sandstone reservoir. Nuclear magnetic resonance (NMR) logging, detecting the relaxation information on pore fluid with hydrogen nuclei in formation, can be used to distinguish irreducible and movable fluids as a result of their different relaxation information. The irreducible water saturation can be determined by the T₂ cutoff method in the conventional reservoir. However, a tight sandstone reservoir possesses a complex pore structure, and relaxation signals of different pore fluids may overlap in the T₂ distribution. The T₂ cutoff method to determine irreducible water saturation may be a challenge in tight sandstone reservoirs. In this study, a novel T₂-distribution-based method, with the film model assumption, was proposed to determine the irreducible water saturation in tight sandstone reservoirs. The T₂ distribution was transformed by a continuous wavelet transform to obtain the two-dimensional matrix of wavelet coefficients, and the position and shape parameters of the spectral peak at different scales in wavelet space were determined. These parameters were used to construct the Gaussian distribution functions (GDFs) at different scales. The T₂ distribution was decomposed on the basis of the constructed GDFs, and then the optimal decomposition was selected. The irreducible water saturation is determined by the optimal T₂ distribution decomposed. The effectiveness and practicability of the proposed method were validated by numerical simulation, core experimental, and NMR logging data processing.

更新日期：2022-09-13

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