The correlation between crushed coal porosity and permeability under various methane pressure gradients: a case study using Jincheng anthracite

2018 ◽  
Vol 8 (3) ◽  
pp. 493-509 ◽  
Author(s):  
Zhen Li ◽  
Guorui Feng ◽  
Haina Jiang ◽  
Shengyong Hu ◽  
Jiaqing Cui ◽  
...  
Keyword(s):  
Pressure Gradients ◽  
Methane Pressure ◽  
Porosity And Permeability

The relationship between synsedimentary fault activity and reservoir quality — A case study of the Ek1 formation in the Wang Guantun area, China

2020 ◽  
Vol 8 (3) ◽  
pp. SM15-SM24 ◽  
Author(s):  
Xixin Wang ◽  
Yuming Liu ◽  
Jiagen Hou ◽  
Shaohua Li ◽  
Qiangqiang Kang ◽  
...  
Keyword(s):  
Grain Size ◽  
Slip Rate ◽  
Size Analysis ◽  
Reservoir Quality ◽  
Accommodation Space ◽  
Controlling Mechanism ◽  
Porosity And Permeability ◽  
Fault Interpretation ◽  
The Relationship

The activity of synsedimentary faults plays an important role in controlling the distribution of sand bodies in basins and furthermore the porosity and permeability of reservoirs. We have used fault interpretation, the method of image and granularity size analysis, and the seismic pumping effect to investigate the control of the activity of the Kongdong fault on the development degree of the dissolution pores and grain size, further studying the controlling mechanism of the activity of synsedimentary faults on reservoir quality (porosity and permeability). The results showed that the slip rate of synsedimentary faults is one of the main factors in controlling reservoir quality. The slip rate controls the accommodation space and hydrodynamic conditions and it furthermore controls the grain size. The higher the slip rate, the bigger the grain size in the downthrow wall of synsedimentary faults; the seismic pump produced by synsedimentary faults activity also controls the development degree of dissolution pores. The development degree of dissolution pores in the downthrown wall of synsedimentary faults is greater than that in the upthrown wall. Dissolution pores are more developed in areas with a large slip rate of synsedimentary faults. Porosity increases gradually with the increase of plane porosity of dissolution pores, whereas the changes of permeability are not obvious.

scholarly journals The influence of reverse-reactivated normal faults on porosity and permeability in sandstones: a case study at Castle Cove, Otway Basin

2018 ◽  
Vol 2018 (1) ◽  
pp. 1-4
Author(s):  
Natalie Debenham ◽  
Natalie J. C. Farrell ◽  
Simon P. Holford ◽  
Rosalind C. King ◽  
David Healy
Keyword(s):  
Normal Faults ◽  
Porosity And Permeability

Estimating porosity and permeability in the Springbok Sandstone, Surat Basin (Queensland), using new wireline log-based workflow

2021 ◽  
Vol 61 (2) ◽  
pp. 720
Author(s):  
Kasia Sobczak ◽  
Heinz-Gerd Holl ◽  
Andrew Garnett
Keyword(s):  
Upper Jurassic ◽  
Coal Seams ◽  
Impact Prediction ◽  
Reservoir Models ◽  
Resistivity Logs ◽  
Porosity And Permeability ◽  
Sandstone Formation ◽  
Definition Of ◽  
Coal Measures

The Upper Jurassic Walloon Coal Measures of the Surat Basin (Queensland) host some of the most prominent coal seam gas (CSG) resources in Australia. The Walloon Coal Measures are directly overlain by the Springbok Sandstone formation, historically referred to as a regional aquifer. An increasing number of studies and industry models suggest relatively limited hydraulic connectivity within the formation and between it and the underlying coal measures, due to extreme lithological heterogeneity. Accurate evaluation of the permeability, as well as lateral and vertical continuity of the lithological units within the Springbok Sandstone, is critical in reservoir models that form the basis of reasonable aquifer protection practices and impact prediction. This study presents a wireline log-based workflow applied to identify permeable zones within the Springbok Sandstone in 31 CSG wells across the Surat Basin that allows robust estimations of porosities and Klinkenberg permeabilities. The workflow primarily utilises spontaneous potential, density, neutron and resistivity logs, and was developed by integrating current industry practices implemented by operators on a local scale to identify risk (permeable) zones in the vicinity of targeted coal seams. The results of this case study indicate that permeable zones within the interval are volumetrically minor (on average 25% N/G) and likely isolated, with Klinkenberg permeabilities rarely exceeding 10–20mD. This evidence for low hydraulic connectivity, as well as significant local variations in the character of the Springbok Sandstone, suggests that the definition of the formation as a regional, continuous aquifer and the way it is modelled needs to be revised.

Diurnal Cycle of Thermally Driven Cross-Basin Winds in Arizona’s Meteor Crater

2011 ◽  
Vol 50 (3) ◽  
pp. 729-744 ◽  
Author(s):  
Manuela Lehner ◽  
C. David Whiteman ◽  
Sebastian W. Hoch
Keyword(s):  
Diurnal Cycle ◽  
Inversion Layer ◽  
Crater Floor ◽  
Pressure Gradients ◽  
Pressure Measurements ◽  
Westerly Winds ◽  
Thermally Driven ◽  
Temperature And Pressure ◽  
The Cross

Abstract Cross-basin winds produced by asymmetric insolation of the crater sidewalls occur in Arizona’s Meteor Crater on days with weak background winds. The diurnal cycle of the cross-basin winds is analyzed together with radiation, temperature, and pressure measurements at the crater sidewalls for a 1-month period. The asymmetric irradiation causes horizontal temperature and pressure gradients across the crater basin that drive the cross-basin winds near the crater floor. The horizontal temperature and pressure gradients and wind directions change as the sun moves across the sky, with easterly winds in the morning and westerly winds in the evening. A case study of 12 October 2006 further illustrates the obtained relation between these parameters for an individual day. The occurrence of an elevated cross-basin flow on 23 October 2006 is shown to relate to the presence of an elevated inversion layer.

scholarly journals Seeing Weather Through Chaos: A Case Study of Disembedding Skills in Undergraduate Meteorology Students

2019 ◽  
Vol 100 (6) ◽  
pp. 997-1010 ◽  
Author(s):  
Peggy McNeal ◽  
Heather Petcovic ◽  
Teresa Bals-Elsholz ◽  
Todd Ellis
Keyword(s):  
Qualitative Case Study ◽  
Spatial Thinking ◽  
Pressure Gradients ◽  
Instructional Interventions ◽  
Thinking Skill ◽  
Rule Based ◽  
Cyclonic Flow ◽  
Verbal Data

AbstractDisembedding, or recognizing patterns in a distracting background, is a spatial thinking skill that is particularly relevant to the interpretation of meteorological surface and upper-air maps. Difficulty “seeing” patterns such as cyclonic flow, thermal ridges, or pressure gradients can make weather analysis challenging for students. In this qualitative case study, we characterize how three undergraduate meteorology students with varying disembedding skill complete a series of meteorological tasks. Videos and transcribed verbal data collected during the task, as well as participant products, were analyzed for instances of disembedding and rule-based reasoning. Results demonstrate that the student with greater disembedding skill relied on observing patterns embedded in meteorological maps in conjunction with rule-based reasoning, whereas the two students with lower disembedding skill preferred generalized application of rules. These results can aid meteorology instructors in recognizing students who struggle with disembedding data and patterns and inform the development of instructional interventions in undergraduate meteorology classrooms.

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