Improving the Total Organic Carbon Estimation of the Eagle Ford Shale with Density Logs by Considering the Effect of Pyrite

Jiang, Shanhe; Mokhtari, Mehdi; Borrok, David M.; Lee, Jim

doi:10.3390/min8040154

Cited by 13 publications

(3 citation statements)

References 20 publications

(27 reference statements)

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“…The linear relation between TOC and bulk density was established, and subsequently, it was found that shale rock density falls as the TOC value drops. 50 …”

Section: Resultsmentioning

confidence: 99%

“…The linear relation between TOC and bulk density was established, and subsequently, it was found that shale rock density falls as the TOC value drops. 50 Theoretically, the shale's organic matter density (1.02−1.11 g/cm 3 ) is less than that of the other part of the rock matrix. Therefore, because of the presence of organic matter in low porosity and permeability shale, rock formation density decreases as the organic content increases.…”

Section: Porosity and Saturationmentioning

confidence: 99%

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Unconventional Reservoir Characterization of Patala Formation, Upper Indus Basin, Pakistan

Ehsan,

Chen,

Latif

et al. 2024

ACS Omega

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Unconventional hydrocarbon exploration is needed in the current oil and gas crisis scenario. Therefore, the development of conditions for unconventional hydrocarbon exploration is needed. In the Upper Indus Basin (UIB), Pakistan, the Patala Formation is one of the potential candidates for this unconventional exploration. It is a proven source rock at the regional level in the Kohat-Potwar sub-basin of UIB. This study aims to evaluate the shale gas potential of the rock in the Minwal-Joyamair area of the sub-basin. Developing a shale rock physics model is important for exploring and developing shale reservoirs due to the difference between unconventional shale and conventional sand reservoirs. These differences include mineral types, mineral characteristics, matrix pores, and fluid properties. To achieve the study's objectives, an integrated strategy provides for evaluating rock physics parameters, petrophysics, and geochemical analyses. This integrated approach indicates that the Patala Formation is a good potential reservoir for shale gas exploration. The Formation has a significant thickness (around 40−50 m), higher total organic carbon content (02−10%), higher brittleness index (0.44−0.56), and relatively shallow depth (2136−3223 m). These research findings suggested that the presence of organic and quartz-rich lithofacies can be considered as highly favorable "sweet spots" for shale-gas exploration in the UIB, Pakistan. Through proper understanding of the spatial and temporal distribution of these "sweet spots", shale-gas exploration can be developed as an effective strategy to exploit shale gas.

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“…The linear relation between TOC and bulk density was established, and subsequently, it was found that shale rock density falls as the TOC value drops. 50 …”

Section: Resultsmentioning

confidence: 99%

Section: Porosity and Saturationmentioning

confidence: 99%

Unconventional Reservoir Characterization of Patala Formation, Upper Indus Basin, Pakistan

Ehsan,

Chen,

Latif

et al. 2024

ACS Omega

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“…We have compiled a study of multiple shale formations focusing on those in the United States. The estimation of the mechanical properties of the formation is primarily taken from Dobson and Houseworth (2013) and other authors (Schwartz et al 2019;Kong et al 2023;Zhou et al 2023;Jin et al 2018;Jiang et al 2018). We assume a slickwater injection into horizontal wells.…”

Section: Representative Casesmentioning

confidence: 99%

How Stress Barriers and Fracture Toughness Heterogeneities Arrest Buoyant Hydraulic Fractures

Möri,

Peruzzo,

Garagash

et al. 2024

Rock Mech Rock Eng

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In our study, we investigated the impact of changes in Mode I fracture toughness and stress barriers on fully developed planar, buoyant hydraulic fractures assuming linear elastic hydraulic fracture mechanics. We present scaling-based arguments to predict the interaction type and use numerical simulations to validate our findings. Through a two-dimensional simplification, we estimate the lower limit for the fracture to feel a change in fracture toughness (so-called immediate breakthrough). Our simulations show that this approach only captures the order of magnitude of the toughness jump necessary for immediate breakthrough compared to the actual value due to three-dimensional solid effects, emphasizing their importance in such systems. We show that we can estimate the occurrence of indefinite containment at depth by considering that lateral spreading occurs at an approximately constant height. However, timing predictions in the case of a transient containment suffer from our simplified approach, which cannot model the injection history of the spreading constant height fracture. The same observations regarding immediate breakthrough and indefinite containment hold when considering stress barriers using pressure-scale-based arguments. Our study shows that the required toughness changes for fracture arrest are more significant than the observed values in the field. In contrast, stress barriers with a magnitude of around 1 MPa are generally sufficient to contain buoyant hydraulic fractures indefinitely. Stress barriers, in combination with other arrest mechanisms, are thus the most prominent mitigation factor of buoyant growth in industrially created hydraulic fractures.

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Statistical analysis and significance of pyrite in the Wufeng-Lower Longmaxi Shale Formation in South China

et al. 2020

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Improving the Total Organic Carbon Estimation of the Eagle Ford Shale with Density Logs by Considering the Effect of Pyrite

Cited by 13 publications

References 20 publications

Unconventional Reservoir Characterization of Patala Formation, Upper Indus Basin, Pakistan

Unconventional Reservoir Characterization of Patala Formation, Upper Indus Basin, Pakistan

How Stress Barriers and Fracture Toughness Heterogeneities Arrest Buoyant Hydraulic Fractures

Statistical analysis and significance of pyrite in the Wufeng-Lower Longmaxi Shale Formation in South China

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