Fluid Discrimination in Ultra-Deep Reservoirs Based on a Double Double-Porosity Theory

Zhou, Xin; Ba, Jing; Santos, Juan E.; Carcione, José M.; Fu, Li‐Yun; Pang, Mengqiang

doi:10.3389/feart.2021.649984

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…Rock physics template (RPT) is an essential tool for mapping the effect of fluids, porosity, and lithology on elastic properties such as P-, S-impedances and V p /V s (Avseth et al, 2010;Zhou et al, 2021). Because impedance and V p /V s are properties that can be obtained from seismic inversion, RPT allows quantitative interpretation and classification not only of well-logs, but also of seismic data.…”

Section: Seismic Characterization With Rock Physics Templatementioning

confidence: 99%

An Efficient Rock Physics Scheme for Estimating Crack Density and Fluid Saturation of Shale Gas Reservoir

Jiang

et al. 2022

Front. Earth Sci.

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We propose a simple rock physics model for the characterization of elastic properties of shale. The model combines a dual-porosity concept and the effective medium theory for constructing the anisotropic elastic tensor of the multimineral organic-rich shale. Based on the model, we address how to estimate two key shale gas evaluation parameters, i.e., crack density and gas saturation from well-log and seismic data. Application to Wufeng-Longmaxi Shale shows that the estimated crack porosity decreases with increasing burial depth and decreasing clay content. The analysis indicates that the microcracks are mainly developed among clay minerals, which is consistent with the results from mercury injection and SEM imaging experiments. More importantly, we show that the velocity of the Wufeng-Longmaxi Shale is primarily controlled by the crack porosity instead of the total porosity. Both P- and S-wave velocities decrease linearly as the volume of microcrack increases. The fluid substitution analysis shows that the Poisson’s ratio and P-impedance of the shale are sensitive to the change of pore-fluid saturation. Based on the above sensitivity analyses, we customize a rock physics template for quantifying crack density, and gas saturation from the shale elastic properties. The interpretation results show that there is an overall good agreement between the measured and predicted petrophysical properties from well-log and seismic data.

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Section: Seismic Characterization With Rock Physics Templatementioning

confidence: 99%

An Efficient Rock Physics Scheme for Estimating Crack Density and Fluid Saturation of Shale Gas Reservoir

Jiang

et al. 2022

Front. Earth Sci.

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“…Therefore, there is an urgent need to develop new methods for identifying reservoir fluids in this area. [18]…”

Section: Introductionmentioning

confidence: 99%

High coincidence rate of fluid identification of carbonate reservoirs in Yan'an gas field by gas logging bright spot -resistivity dark spot technology

Wang

Zhou

et al. 2023

Preprint

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The main gas layer of the Lower Paleozoic in the Yan'an gas field in the Ordos Basin is the carbonate rock of the Majiagou Formation, which is a low-porosity and low-permeability reservoir. Its storage space is mainly composed of intercrystalline pores, intercrystalline dissolved pores, dissolved caves and micro-fractures, with strong heterogeneity. The reservoir generally contains pyrite, which makes the resistivity value negatively abnormal, which interferes with the identification of low-resistivity fluids in the high-resistivity background. This leads to the failure of traditional logging interpretation methods and the low coincidence rate of reservoir interpretation. Through the statistical analysis of 240 drilling and gas testing data, the sensitive parameters of logging total hydrocarbon and logging resistivity are selected from many reservoir parameters. On this basis, after effective technical treatment, a “gas logging bright spot-resistivity dark spot technology” for carbonate reservoirs is formed. Through the field application and gas test results of 35 wells in Yan'an gas field in 2021, the interpretation coincidence rate is as high as 83%, which is much higher than the previous traditional method coincidence rate (44.3%). This study organically combines the advantages of mud logging and logging technologies, and establishes a reservoir interpretation chart and standard, which solves the long-standing problem of low coincidence rate in the identification of carbonate reservoir fluids in the geological community. An effective method for predicting favorable carbonate oil and gas areas is provided.

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The Seismic Method

Tylor‐Jones¹,

Azevedo²

2022

A Practical Guide to Seismic Reservoir Characterization

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Fluid Discrimination in Ultra-Deep Reservoirs Based on a Double Double-Porosity Theory

Cited by 6 publications

References 45 publications

An Efficient Rock Physics Scheme for Estimating Crack Density and Fluid Saturation of Shale Gas Reservoir

An Efficient Rock Physics Scheme for Estimating Crack Density and Fluid Saturation of Shale Gas Reservoir

High coincidence rate of fluid identification of carbonate reservoirs in Yan'an gas field by gas logging bright spot -resistivity dark spot technology

The Seismic Method

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