Modeling elastic properties of siliciclastic rocks

Vernik, Lev; Kachanov, Mark

doi:10.1190/1.3494031

Cited by 127 publications

(59 citation statements)

References 29 publications

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“…Many shale-gas formations share properties such as low matrix porosity and low permeability (Vernik and Kachanov, 2010). We chose our experimental technique to investigate the variations of P-and S-wave velocities as a function of TOC content for 12 samples under varying stress levels.…”

Section: Elastic Properties Of Synthetic Shalesmentioning

confidence: 99%

Shale elastic property relationships as a function of total organic carbon content using synthetic samples

Altowairqi¹,

Rezaee²,

Evans³

et al. 2015

Journal of Petroleum Science and Engineering

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Section: Elastic Properties Of Synthetic Shalesmentioning

confidence: 99%

Shale elastic property relationships as a function of total organic carbon content using synthetic samples

Altowairqi¹,

Rezaee²,

Evans³

et al. 2015

Journal of Petroleum Science and Engineering

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“…Porous media in tight sandstones is undergone to severe cementation (Vernik and Kachanov, 2010). Clay filling, quartz/clay overgrowth and carbonate cementation can disconnect pores and severely increase tortuosity.…”

Section: Rock Typing Using Effective Specific Surfacementioning

confidence: 99%

Rock Typing of Tight Gas Sands: A Case Study in Lance and Mesaverde Formations From Jonah Field

Aliyev

2015

Day 3 Wed, September 30, 2015

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The Jonah field is one of the biggest tight gas sand fields in the Green River basin. Production profiles from its deeper sections show high liquid hydrocarbons close to the Pinedale anticline, especially in Mesaverde and Lance formations. To assess the potential of condensate production, new approaches for rock classification are needed that will allow us to differentiate between discontinuous sandstone layers and the interbedded siltstones. Currently, the only cutoff used is for gamma ray: rocks below 75 API are designated as sandstones.Although, significant porosity and permeability variations occur within the sandstone zones, the only criterium used to differentiate between reservoir and non-reservoir rocks is porosity: sandstones with porosity > 6% are considered reservoir quality rocks. Porosity is considered main controlling factor on permeability. A 6% porosity cut off in sandstones was used in net-pay calculations. However, hydraulic rock typing demonstrates permeability is dependent on main pore throat radius, rather than porosity. This study presents rock typing for tight sandstones and siltstones with an understanding of petrophysical properties such as pore structure, porosity, permeability, and cementation.I studied 14 samples from the Mesaverde and Lance Formations with lithologies varying from clean sandstone to mudstone. X-ray diffraction (XRD) mineralogy and mercury injection capillary pressure (MICP) were measured for all samples. NMR transverse relaxation times (T 2 ) at 2 MHz were also measured for 10 water saturated samples. Nitrogen adsorption tests were performed on 8 samples. Ultrasonic velocities from 10 samples were measured at different confining pressure conditions. Thin section petrography was used to analyze the cementation and pseudomatrix clay effects on pore and pore throat size.MICP data are used to subdivide rocks into three groups based on pore throat size distribution: reservoir sandstones, non-reservoir sandstone and siltstone/mudstone. Dominant pore throat size for reservoir and non-reservoir sandstones are 400 and 100 nm, respectively.iii In order to apply pore throat size rock typing to downhole measurements, NMR pore size classification is used to identify formations. Pore size from NMR demonstrated equivalent behavior to pore throat size from MICP. The logarithmic mean values of T 2 transverse relaxation times for reservoir, non-reservoir sandstone and siltstone/mudstone are 22.2 ms, 3.4 ms and 0.29 ms, respectively. Clear separation of reservoir sandstone, non-reservoir sandstone and siltstone is seen based on compressibility behavior from compressional velocity during initial pressure loading. Reservoir sandstone demonstrates the highest compressibility. In addition, siltstone and mudstone were separated based on log differential pore volume distribution from N 2 adsorption data.Based on pore size distribution data, four main rock types are identified in Lance and Mesaverde formations in Jonah field. Rock typing based on gamma ray and porosity logs can be con...

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“…Because of these characteristics, according to the opinion of Vernik and Kachanov (2010), these sandstones can be described microstructurally as a continuous material with isolated pores and intergranular cracks. So we adopted the inclusion-based effective medium model to analyze tight sandstone experimental data from Guang'an.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the mid-low porosity sandstone dry frame in central Sichuan based on effective medium theory

et al. 2011

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Tight gas sandstone reservoirs in Guang'an are characterized by wide distribution and low abundance. Sandstone samples from this area usually have low porosity and poor connectivity. We analyze the observed velocity data of tight sandstone samples with the MoriTanaka model, and give the sandstone framework physical model in this area based on theory and experiment analysis. The matrix modulus was obtained by an empirical relationship and then the experiment data were compared with the values predicted by the Mori-Tanaka model with different pore shapes. The results revealed that the experiment data were close to the model with low pore aspect ratio. Considering the matrix modulus and pore shape variation, we find that, under the condition of small mineral composition change, the effective pore aspect ratio of these samples increased with porosity evidently.

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Modeling elastic properties of siliciclastic rocks

Cited by 127 publications

References 29 publications

Shale elastic property relationships as a function of total organic carbon content using synthetic samples

Shale elastic property relationships as a function of total organic carbon content using synthetic samples

Rock Typing of Tight Gas Sands: A Case Study in Lance and Mesaverde Formations From Jonah Field

Analyzing the mid-low porosity sandstone dry frame in central Sichuan based on effective medium theory

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