Influence of horizontal and vertical stresses on Vp‐Vs trends

Bakulin, Andrey; Kets, F.; Vines, R. E.; Wieseneck, James; Hauser, Matt R.

doi:10.1190/1.3059220

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…EA Kuzmina and OS Bulychev determined the structure of injuries in handball. [1][2][3] As can be seen in Figure 1, the most characteristic for handball players are: I. injuries of the knee joint (ligamentous apparatus, menisci) that occur when jumping and abrupt change of direction (turns) -24%;…”

Section: Introductionmentioning

confidence: 99%

Features injuries handball players 18-20 years old in competition

Marina,

Fateh

2024

IPMRJ

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Handball is a game sport that combines a high level of physical psychological preparedness and technical and tactical skill. The first great successes come to players after 1-12 years of systematic preparation. The most talented young handball players from youth begin to move to the teams of men's clubs, and then join the ranks of the national team, while others, having received injuries, say goodbye to handball. The purpose of the study is to determine the nature of injuries to handball players aged 18-20 years, to identify the main types of injuries to handball players of different ages and playing positions. The data obtained suggest insufficient physical and technical-tactical readiness of handball players under 20 years old for the intense conditions of major international competitions. In turn, this makes it possible to develop effective means of preventing injuries in the early stages of long-term training.

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Section: Introductionmentioning

confidence: 99%

Features injuries handball players 18-20 years old in competition

Marina,

Fateh

2024

IPMRJ

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Hypothesis for the origin of anomalous V_P/V_S ratios in GOM subsalt mudrocks: Implications for pore pressure prediction

Bryndzia

2022

The Leading Edge

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Acoustic properties of subsalt mudrocks from the Gulf of Mexico (GOM) often display unusual VP/VS ratio behavior that has been attributed to differences in the vertical and horizontal stress states below base salt. The observed VP/VS ratios are higher relative to established GOM mudrock calibrations, returning to trend with increasing depth below base salt. In the Mississippi Canyon area of the GOM, temperatures at base salt are lower by up to 40°F relative to the regional thermal gradient. The present study tested the hypothesis that the unusual mudrock acoustic properties were caused by precipitation of halite in mudrock pores due to cooling of a halite-saturated brine, caused by conductive loss of heat through overlying salt. A drop of approximately 40°F from 235°F for the normal thermal gradient, to the present-day subsalt temperature of 190°F, results in a reduction of soluble halite at saturation of up to about 30 volume percent (vol%). A Gassmann fluid substitution model in which solid halite replaces brine in mudrock pores was used to test this hypothesis. The results of the Gassmann fluid substitution model reproduce the observed acoustic log responses measured in subsalt mudrocks from prospect B, a deepwater GOM subsalt discovery. The results show that about 30 vol% solid halite could explain most of the observed deviations in VP/VS ratio, with model and observations returning to normal VP/VS behavior with 5%–10% solid halite substituted for brine at approximately 2500 ft below base salt. P-wave velocity-void ratio–vertical effective stress (VP-∊-σv) pore pressure models have traditionally fared poorly in subsalt mudrocks. Such models generally rely on VP-porosity relationships that are controlled by compaction in which the vertical effective stress, i.e., overburden stress, is the maximum historical stress. These conditions of stress and porosity are clearly not satisfied in subsalt mudrocks. Predicted velocities are too fast, inferred porosity and void ratios are too low, and subsequent estimates of pore pressure are too high. The model discussed in this paper explains the apparent disconnect between predicted and observed subsalt mudrock porosities and offers a relatively simple method for correcting them using the results of the Gassmann halite-brine fluid substitution model.

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Influence of horizontal and vertical stresses on Vp‐Vs trends

Cited by 2 publications

References 12 publications

Features injuries handball players 18-20 years old in competition

Features injuries handball players 18-20 years old in competition

Hypothesis for the origin of anomalous V_P/V_S ratios in GOM subsalt mudrocks: Implications for pore pressure prediction

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Influence of horizontal and vertical stresses on Vp‐Vs trends

Cited by 2 publications

References 12 publications

Features injuries handball players 18-20 years old in competition

Features injuries handball players 18-20 years old in competition

Hypothesis for the origin of anomalous VP/VS ratios in GOM subsalt mudrocks: Implications for pore pressure prediction

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Hypothesis for the origin of anomalous V_P/V_S ratios in GOM subsalt mudrocks: Implications for pore pressure prediction