High-Resolution Temperature Logs in a Petroleum Setting: Examples and Applications

Blackwell, David; Beardsmore, Graeme; Nishimori, Richard K.; McMullenJr., Richard J.

doi:10.1007/978-1-4615-4751-8_1

Cited by 10 publications

(8 citation statements)

References 30 publications

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“…Such examples are well recognized and described by Jessop [1990]. The influence of water circulation in the Canadian Sedimentary basin has been recently reanalyzed by Bachu [1999], Blackwell and Beardsmore [1999], and Majorowicz et al [1999a, 1999b]. New permeability data from Bachu [1999] for the clastic sediments with large fraction of clays and shales that are characteristic for the depths in which temperature logs have been done show very low permeability leading to very low water velocities of <10 −2 m/yr.…”

Section: Introductionmentioning

confidence: 99%

“…It is therefore estimated that the change in heat flow is smaller than the errors due to temperature gradient accuracy. Current consensus, based on new data and modeling, is that the effects of water circulation upon heat transfer in sedimentary basins have been overestimated in the past [ Bachu , 1999; Blackwell and Beardsmore , 1999; Majorowicz et al , 1999a, 1999b].…”

Section: Introductionmentioning

confidence: 99%

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East to west retardation in the onset of the recent warming across Canada inferred from inversions of temperature logs

Majorowicz¹,

Šаfanda

Skinner

2002

J. Geophys. Res.

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[1] Canadian well temperature logs for 141 sites are analyzed and show evidence of extensive ground surface temperature (GST) warming beginning in the eighteenth and nineteenth centuries following a lengthy period of cooling (the Little Ice Age) over most of the past millennium. The method of functional space inversion (FSI) is applied to the complete set of 141 well precise temperature logs from wells located in low-conductivity clastic sediments of the western Canadian Sedimentary basin and higher thermal conductivity crystalline rocks of the Canadian Shield in central and eastern Canada. Marked regional differences in the onset of recent warming are evident (nineteenth century compared to the seventeenth to eighteenth centuries, respectively), following a prolonged cold period through earlier centuries. Analysis of spatial patterns of GST history changes across Canada based on the individual inversions of temperature logs shows a systematic east-to-west retardation in the onset of the recent warming yet a higher overall warming magnitude in western Canada in the twentieth century. INDEX TERMS:0915 Exploration Geophysics: Downhole methods; 1610 Global Change: Atmosphere (0315, 0325); KEYWORDS: Canada climate warming, borehole temperature, geothermics Citation: Majorowicz, J., J. Safanda, and W. Skinner, East to west retardation in the onset of the recent warming across Canada inferred from inversions of temperature logs,

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

East to west retardation in the onset of the recent warming across Canada inferred from inversions of temperature logs

Majorowicz¹,

Šаfanda

Skinner

2002

J. Geophys. Res.

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“…However, despite those improvements using single BHTs or DSTs will never approach the quality of information associated with the employment of precise temperature logs. As discussed by Wisian et al (1998) and Blackwell et al (1999), there are types of wells that can be successfully logged for temperatures, and advanced temperature logging systems that are readily available in the commercial petroleum exploration and production setting.…”

Section: Discussionmentioning

confidence: 99%

Analysis of borehole temperature data in the Northeast German Basin: continuous logs versus bottom-hole temperatures

Förster

2001

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Temperature recordings from exploration boreholes for hydrocarbons and geothermal energy are evaluated to select the best-suitable data for determining formation temperature and heat flow in the Northeast German Basin. Repeated temperature logs measured in several boreholes allow a classification into equilibrium logs and perturbed logs. For the latter, a simple empirical correction is proposed based on mean annual ground-surface temperature, the estimated amount of temperature correction at total depth of log, and the depth-dependent cross-over point of temperature perturbation due to drilling. Analysis of bottom-hole temperatures (BHTs) showed that the uncorrected values deviate, on average, by as much as 22.2 10.2 C (1 ) from the formation temperature. BHTs corrected using the Horner-plot method are systematically too low by 1-2 C compared to values corrected using the exact solution to the full line-source equation. Both correction methods yield values that underestimate formation temperatures by as much as 9 C and 8 C, respectively. The large standard deviation (1 ) of about 8 C indicates that a corrected BHT reflects (with 96% confidence, 2 ) formation temperature not better than 16 C. However, using temperature logs in conjunction with the corrected BHTs allowed a prediction of formation temperatures with an error less than 10 C at somewhat deeper depths than the log in several boreholes. The availability of continuous temperature logs as a prerequisite for a reduction of error of BHTs significantly reduced the quantity of useable corrected BHTs in the basin.

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“…Use of the extensive BHT data set is a new feature of the heat-flow map and this temperature-at-depth analysis used in previous studies. The BHT data were calibrated by comparison to a series of precision temperature measurements made in hydrocarbon wells in thermal equilibrium, and a BHT error was thus established (Blackwell and Richards, 2004b;Blackwell et al, 1999). Data up to a maximum depth of 3,000 m were used (4,000 m in southern Louisiana).…”

Section: Geothermal Gradientsmentioning

confidence: 99%

The Future of Geothermal Energy

Renner¹

2006

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High-Resolution Temperature Logs in a Petroleum Setting: Examples and Applications

Cited by 10 publications

References 30 publications

East to west retardation in the onset of the recent warming across Canada inferred from inversions of temperature logs

East to west retardation in the onset of the recent warming across Canada inferred from inversions of temperature logs

Analysis of borehole temperature data in the Northeast German Basin: continuous logs versus bottom-hole temperatures

The Future of Geothermal Energy

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