Geothermal Gradients in the Upper Amazon Basin derived from BHT data

Barba, D.; Barragán, Roberto; Gallardo, Jonathan; Valle, Alfonso Salguero del

doi:10.31214/ijthfa.v4i1.58

Cited by 3 publications

(2 citation statements)

References 25 publications

(35 reference statements)

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“…En algunas cuencas se estudió el gradiente geotérmico, el antearco (Manabí, Golfo de Guayaquil y la Provincia Geológica Progreso-Tumbes), que presentan un gradiente geotérmico promedio bajo (17 a 24°C/km), debido a la presencia de un basamento oceánico frío de edad Cretácico medio (Barba, 2017). En el caso de la cuenca Oriente, se reportan gradientes geotérmicos promedios de 22°C/km (Burgos et al, 2004), 21,4°C/km para un intervalo de 1,5 a 3,5 km de profundidad (Hamza et al, 2005) y 23,9°C/km (Barba et al, 2021).…”

Section: Introductionunclassified

Zonificación del gradiente geotérmico en la cuenca Oriente de Ecuador a partir de temperatura de fondo de pozos

2023

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La cuenca Oriente (Cretácico-Cenozoico tardío) es una de las más complejas y atractivas cuencas sedimentarias de antepaís de los Andes septentrionales. Está constituida por diversos ciclos tectónicos y sedimentarios, desarrollada sobre un basamento Precámbrico. Con el fin de evaluar el potencial geotérmico teórico y los usos potenciales del calor en la cuenca, datos de temperaturas de fondo de pozos (BHT) de 1683 pozos petroleros profundos, distribuidos en 202 campos individuales, han sido ploteados en un mapa georreferenciado, cubriendo un área de 57.400 km2. El tratamiento estadístico de los datos para el cálculo del gradiente geotérmico incluyó correcciones de las BHT, de acuerdo con el método propuesto por Willet y Chapman. A partir de los datos trazados, se hace evidente que a lo largo del Corredor Sacha-Shushufindi, muestra valores bajos de gradiente (7,38 a 26,1ºC/km). Por el contrario, los valores altos de gradiente (26,1 a 69,01ºC/km) están presentes en el Sistema Subandino y en el Sistema Capirón-Tiputini. La distribución de anomalías de temperatura parece estar relacionada con el control estructural NNE-SSO de la cuenca, cuyo patrón de permeabilidad es bien conocido. La extracción de calor para usos comerciales se ve altamente facilitada por la existencia de pozos profundos que penetran en zonas de alto gradiente, lo que ahorra los costos generalmente prohibitivos de la perforación profunda.

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Section: Introductionunclassified

Zonificación del gradiente geotérmico en la cuenca Oriente de Ecuador a partir de temperatura de fondo de pozos

2023

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“…However, conventional methods are still widely used, e.g., [31], because they are easier to apply and require less information about the geophysical properties of the drilling fluid and the formation, as well as less computational effort than the more complex methods. Thus, they are often applied at wells with poor documentation where the accuracy of the information may be doubted or where the necessary parameters for the correction methods are often not known at all.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty Assessment of Corrected Bottom-Hole Temperatures Based on Monte Carlo Techniques

et al. 2022

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Most temperature predictions for deep geothermal applications rely on correcting bottom-hole temperatures (BHTs) to undisturbed or static formation temperatures (SFTs). The data used for BHT correction are usually of low quality due to a lack of information and poor documentation, and the uncertainty of the corrected SFT is therefore unknown. It is supposed that the error within the input data exceeds the error due to the uncertainty of the different correction schemes. To verify this, we combined a global sensitivity study with Sobol indices of six easy-to-use conventional correction schemes of the BHT data set of the Bavarian Molasse Basin with an uncertainty study and developed a workflow that aims at presenting a valid error range of the corrected SFTs depending on the quality of their input data. The results give an indication of which of the investigated correction methods should be used depending on the input data, as well as show that the unknown error in the input parameters exceeds the error of the individual BHT correction methods as such. The developed a priori uncertainty-based BHT correction helps to provide a real estimate of the subsurface temperatures needed for geothermal prospecting and probabilistic risk assessment.

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Extension of Duplexed Single-Ended Distributed Temperature Sensing Calibration Algorithms and Their Application in Geothermal Systems

Lillo

Suárez

Hausner

et al. 2022

Sensors

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Fiber-optic distributed temperature sensing (DTS) has been widely used since the end of the 20th century, with various industrial, Earth sciences, and research applications. To obtain precise thermal measurements, it is important to extend the currently available DTS calibration methods, considering that environmental and deployment factors can strongly impact these measurements. In this work, a laboratory experiment was performed to assess a currently available duplexed single-ended DTS calibration algorithm and to extend it in case no temperature information is available at the end of the cables, which is extremely important in geothermal applications. The extended calibration algorithms were tested in different boreholes located in the Atacama Desert and in the Central Andes Mountains to estimate the geothermal gradient in these regions. The best algorithm found achieved a root mean square error of 0.31 ± 0.07 °C at the far end of a ~1.1-km cable, which is much smaller than that obtained using the manufacturer algorithm (2.17 ± 0.35 °C). Moreover, temperature differences between single- and double-ended measurements were less than 0.3 °C at the far end of the cable, which results in differences of ~0.5 °C km−1 when determining the geothermal gradient. This improvement in the geothermal gradient is relevant, as it can reduce the drilling depth by at least 700 m in the study area. Future work should investigate new extensions of the algorithms for other DTS configurations and determining the flow rate of the Central Andes Mountains artesian well using the geothermal profile provided by the DTS measurements and the available data of the borehole

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Geothermal Gradients in the Upper Amazon Basin derived from BHT data

Cited by 3 publications

References 25 publications

Zonificación del gradiente geotérmico en la cuenca Oriente de Ecuador a partir de temperatura de fondo de pozos

Zonificación del gradiente geotérmico en la cuenca Oriente de Ecuador a partir de temperatura de fondo de pozos

Uncertainty Assessment of Corrected Bottom-Hole Temperatures Based on Monte Carlo Techniques

Extension of Duplexed Single-Ended Distributed Temperature Sensing Calibration Algorithms and Their Application in Geothermal Systems

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