Microcrack Porosity Estimation Based on Rock Physics Templates: A Case Study in Sichuan Basin, China

Ruan, Chuantong; Ba, Jing; Carcione, José M.; Chen, Tiansheng; He, Runfa

doi:10.3390/en14217225

Cited by 4 publications

(3 citation statements)

References 48 publications

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“…) 0 (20) After dividing both sides of Equation ( 19) by EI 0 , and by taking the natural logarithm of each side, Equation ( 21) is formed:…”

Section: Elastic Impedance Inversion Based On the New Avo Equationmentioning

confidence: 99%

“…The applicability of the DP model has been validated by experimental investigations [4,5] and numerical modeling based on well-log data [18]. Furthermore, various rock physics templates (RPTs) have been developed to estimate the pore structures in tight sandstones [19,20], as well as to identify fluids [21] and evaluate the brittleness [22]. However, the target-oriented features of the RPTs may limit the applicability of the methods in the evaluation of the petrophysical properties of the entire tight formation and within a range of depths.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Tight Gas Sandstone Properties Based on Rock Physical Modeling and Seismic Inversion Methods

Jin,

Liu,

Guo

2023

Energies

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Tight sandstones produce an increasing amount of natural gas worldwide. Apart from identifying the gas enrichment, the predictions of lithology and permeable zones are crucial for the prediction of tight gas sandstones. In the present study, a seismic inversion method is developed based on rock physical modeling, by which it is possible to directly predict the lithology and pore structure in tight formations. The double-porosity model is used as a modeling tool in considering complex pore structures. Based on the model, the microfracture porosity is then predicted using logging data, which are used as a factor to estimate microfractures. Parameters representing the lithology and pore structure are proposed and estimated using logging data analyses and rock physical modeling based on the framework of the Poisson impedance. Thereafter, a new AVO equation is established and extended to the form of an elastic impedance for a direct prediction of the lithology and pore structure parameters. Real data applications show that the indicators of lithology and permeable zones are consistent with the production status. They agree with the petrophysical properties measured in wellbores, thereby proving the applicability of the proposed method for the effective characterization of tight gas sandstones.

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“…) 0 (20) After dividing both sides of Equation ( 19) by EI 0 , and by taking the natural logarithm of each side, Equation ( 21) is formed:…”

Section: Elastic Impedance Inversion Based On the New Avo Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Tight Gas Sandstone Properties Based on Rock Physical Modeling and Seismic Inversion Methods

Jin,

Liu,

Guo

2023

Energies

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“…For instance, the rock physics templates (RPTs) were employed for fluid identification [20] and brittleness evaluation [21] in tight sandstone reservoirs. At the same time, several successful applications have been reported for estimating pore microstructure in tight sandstones using RPTs [22,23]. However, one of the inherent limitations of applying RPTs for estimating reservoir parameters is that the corresponding implementation is target-oriented, where the interpretation on a particular template may work only for a specific target layer.…”

Section: Introductionmentioning

confidence: 99%

Pore and Microfracture Characterization in Tight Gas Sandstone Reservoirs with a New Rock-Physics-Based Seismic Attribute

Guo¹,

Qin²,

Liu³

2023

Remote Sensing

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Pores and microfractures provide storage spaces and migration pathways for gas accumulation in tight sandstones with low porosity and permeability, acting as one of the controlling factors of gas production. The development of a rational rock physics model is essential for better understanding the elastic responses of tight sandstone with complex pore structures. Accordingly, seismic characterization of pores and microfractures based on the rock physics model provides valuable information in predicting high-quality tight gas sandstone reservoirs. This paper proposes a rock-physics-based approach to compute the pore–microfracture indicator (PMI) from elastic properties for pore structure evaluation in tight sandstones. The PMI is achieved based on the axis rotation of the elastic parameter space using well-log data. The rotation angle is determined by finding the maximum correlation between the linearized combination of the elastic parameters and the introduced factor associated with total porosity and microfracture porosity. The microfracture porosity is then estimated with an inversion scheme based on the double-porosity model. Finally, the optimized rotation angle is employed to compute the PMI with seismic data. The obtained results are of great benefit in predicting the permeable zones, providing valuable information for sweet spot characterization in tight gas sandstone reservoirs.

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Quantitative characterization of tight gas sandstone reservoirs using seismic data via an integrated rock-physics-based framework

Guo,

Qin,

Liu

2023

Petroleum Science

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Microcrack Porosity Estimation Based on Rock Physics Templates: A Case Study in Sichuan Basin, China

Cited by 4 publications

References 48 publications

Characterization of Tight Gas Sandstone Properties Based on Rock Physical Modeling and Seismic Inversion Methods

Characterization of Tight Gas Sandstone Properties Based on Rock Physical Modeling and Seismic Inversion Methods

Pore and Microfracture Characterization in Tight Gas Sandstone Reservoirs with a New Rock-Physics-Based Seismic Attribute

Quantitative characterization of tight gas sandstone reservoirs using seismic data via an integrated rock-physics-based framework

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