Quantitative Analysis of Geopressure for Geoscientists and Engineers

Dutta, Nader C.; Bachrach, Ran; Mukerji, Tapan

doi:10.1017/9781108151726

Cited by 12 publications

(2 citation statements)

References 432 publications

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“…The effective pressure cube (also known as differential pressure) governs the compaction process in sedimentary rocks. Geopressuring implies that the rock has low effective stress and a higher porosity than would be expected when the rock was normally compacted; it results in a lower rock velocity (Dutta et al 2021). Pressure test data of the studied field generally start from Sarvak and continue to Gotnia Formation, but data in the upper formations are minimal (Fig.…”

Section: Effective Pressure Cubementioning

confidence: 95%

Determining the drilling mud window by integration of geostatistics, intelligent, and conditional programming models in an oilfield of SW Iran

Kianoush

Mohammadi

Hosseini

et al. 2023

J Petrol Explor Prod Technol

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Accurate knowledge of pore and fracture pressures is essential for drilling wells safely with the desired mud weight (MW). Overpressure occurs when the pore pressure is higher than the normal hydrostatic pressure. There is a challenge regarding the pressure studies domain in an oilfield in SW Iran, where lack of geo-mechanical data limits exact mud window calculation. Also, the reservoir generally consists of carbonate rocks and contains no shale interbeds, so mechanical stratigraphy based on Gamma ray could not be applied. This study is to provide safe drilling considering MW to prevent the flow or loss in the vicinity of the new wells in the studied field. In this research, the formation pressures and mud window models are determined by combining geostatistical, intelligent, and conditional programming models and compared with real data. The conditional programming was also used to correct small out-of-range data. The highest correlation between the final effective pressure and velocity cube was observed in lower Fahliyan Formation with 0.86 and Ilam with 0.71.The modeled MW difference ranged between 2.5 and 30 PCF. Also, the maximum modeled MW is 150 PCF in the upper Fahliyan Formation. Heavy mud of more than 130 PCF is suggested for drilling the Khalij member and continues to the end of stratigraphy column. Best observed correlation comparing the drilled and modeled MW, especially achieved in the Fahliyan reservoir Formation with more than 100 PCF and the Ilam Formation with 80–100 PCF. Finally, 3D formation pressures are presented and recommended for further safe drillings.

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Section: Effective Pressure Cubementioning

confidence: 95%

Determining the drilling mud window by integration of geostatistics, intelligent, and conditional programming models in an oilfield of SW Iran

Kianoush

Mohammadi

Hosseini

et al. 2023

J Petrol Explor Prod Technol

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show abstract

“…Direct P p measurement tests such as RFTs and MDTs are the most reliable measurements (Gunter & Moore, 1986; Zoback, 2007). However, these direct Pp measurements are difficult to acquire, particularly in low permeability formations, and are often only conducted at depths where possible overpressures may exist (Dutta et al., 2021; Lee et al., 2022; Y. Z. Ma & Holditch, 2015; Zoback, 2007).…”

Section: Methodology and Datamentioning

confidence: 99%

Shallow Tectonic Stress Magnitudes at the Hikurangi Subduction Margin, New Zealand

Behboudi,

McNamara,

Lokmer

2023

Geochem Geophys Geosyst

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Quantifying tectonic stress magnitudes is crucial in understanding crustal deformation processes, fault geomechanics, and variable plate interface slip behaviors in subduction zones. The Hikurangi Subduction Margin (HSM), New Zealand, is characterized by along‐strike variation in interface slip behavior, which may be linked to tectonic stress variations within the overriding plate. This study constrains in situ stress magnitudes of the shallow (<3 km) overriding plate of the HSM to better understand its tectonics and how they relate to larger scale subduction dynamics. Results reveal σ3: Sv ratios of 0.6–1 at depths above 650–700 m TVD and 0.92–1 below this depth interval along the entire HSM. Additionally, for depths below 650–700 m TVD, SHmax: Sv ratios of 0.95–1.81 in the central HSM and 0.95–2.3 in the southern HSM are estimated. These stress ratios suggest a prevalent thrust to strike‐slip (σ1 = SHmax) faulting regime across the central and southern HSM. In the central HSM, the presence of NNE‐NE striking reverse faults co‐existing with a modern σ1 (SHmax) aligned ENE‐WSW suggests that overtime the stress state here evolved from a contractional to a strike‐slip state, where the compressional direction changes from perpendicular (NW‐SE) to oblique (ENE‐WSW) to the Hikurangi margin. This temporal change in stress state may be explained by forearc rotation, likely combined with the development of upper plate overpressures. In the southern HSM, the modern WNW‐ESE/NW‐SE σ1 (SHmax) and pre‐existing NNE‐NE striking reverse faults indicate that stress state remains contractional and perpendicular (NW‐SE) to the Hikurangi margin overtime.

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High Precision Pre-drilling Pressure Prediction for Complex Cause’s Overpressure

Lei,

Hu,

Lin

et al. 2024

Springer Series in Geomechanics and Geoengineering

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Quantitative Analysis of Geopressure for Geoscientists and Engineers

Cited by 12 publications

References 432 publications

Determining the drilling mud window by integration of geostatistics, intelligent, and conditional programming models in an oilfield of SW Iran

Determining the drilling mud window by integration of geostatistics, intelligent, and conditional programming models in an oilfield of SW Iran

Shallow Tectonic Stress Magnitudes at the Hikurangi Subduction Margin, New Zealand

High Precision Pre-drilling Pressure Prediction for Complex Cause’s Overpressure

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