An outcrop gamma ray study of the Tumblagooda Sandstone, Western Australia

Evans, R.; Mory, Arthur J.; Tait, Alan

doi:10.1016/j.petrol.2006.02.004

Cited by 24 publications

(11 citation statements)

References 36 publications

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“…Clay minerals are characterized by clay content. For example, the clay content in a stratum shows a positive correlation with the TH content (Xing et al 2005;Alastair and Richard 2000;Evansa et al 2007;Lima et al 2005). Meanwhile, if the TH has sufficient time to sediment together with the clay particles under a weak hydrodynamic condition, the TH content will be increased with the increase of the clay content in the rocks.…”

Section: Principlesmentioning

confidence: 99%

A new method of deep carbonate lithology identification at the Tadong uplift in the eastern section of the Tarim Basin

et al. 2016

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The lithology identification of deep carbonate rocks has always been a difficult field of research. The deep carbonate rock formations in the eastern section of the Tarim Basin have complex tectonism, deposition, and diagenesis. Therefore, it is difficult to use conventional logging information to identify the lithology of deep carbonate rocks. In this study, a natural gamma ray spectrometry log in unconventional logging was used to discover a new method (comprehensive superposition method) for the lithology identification of deep carbonate rocks. The research results showed that the TH, U, K, and KTH information in a natural gamma ray spectrometry log can reflect the lithological characteristics of carbonate rocks extremely well. In addition, this new identification method was able to optimize the typical logging parameters which could best reflect the lithology of the carbonate rocks after analyzing the original record curve and a variety of combined curves of the natural gamma ray spectrometry. This new method could comprehensively superpose the typical logging parameters and was capable of finally quantitatively identifying the lithology of dolomite, micrite, calcarenite, and finely crystalline limestone in deep carbonate rocks, with an identification accuracy of more than 79 %. On the basis of the above research results, a special statistical method was made to analyze the typical logging parameters of natural gamma ray spectrometry and to assist and test the identification of a comprehensive superposition method, in order to improve the lithology identification accuracy. This new method for the lithology identification of deep carbonate rocks, based on a natural gamma ray spectrometry log, achieved good application effects in the eastern section of the Tarim Basin.

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Section: Principlesmentioning

confidence: 99%

A new method of deep carbonate lithology identification at the Tadong uplift in the eastern section of the Tarim Basin

et al. 2016

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“…In addition to lateral spacing, the counter can be placed on rock surfaces for small volume sampling (see Figure 1) or else held above rock surfaces to sample significantly wider areas at once [18,47]. Sampling time also varies in surveys from seconds [48] to several minutes [46,49] depending on the surveyor and survey design. Typically in areas of lower radioactivity rock, longer sample times are needed for suitably accurate results [22].…”

Section: Instrumentationmentioning

confidence: 99%

Gamma-ray Spectrometry in Geothermal Exploration: State of the Art Techniques

et al. 2014

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Gamma-ray spectrometry is a surveying technique that allows the calculation of the heat produced during radioactive decay of potassium, uranium, and thorium within rock. Radiogenic heat producing rocks are often targets for geothermal exploration and production. Hence, refinements in gamma-ray spectrometry surveying will allow better constraint of resources estimation and help to target drilling. Gamma-rays have long half-lengths compared to other radiation produced during radiogenic decay. This property allows the gamma-rays to penetrate far enough through media to be detected by airborne or ground based surveying. A recent example of ground-based surveying in Scotland shows the ability of gamma-ray spectrometry to quickly and efficiently categorize granite plutons as low or high heat producing. Some sedimentary rocks (e.g., black shales) also have high radiogenic heat production properties and could be future geothermal targets. Topographical, atmospheric and spatial distribution factors (among others) can complicate the collection of accurate gamma-ray data in the field. Quantifying and dealing with such inaccuracies represents an area for further improvement of these techniques for geothermal applications.

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“…A correlação estratigráfica de depósitos fluviais é difícil utilizando apenas dados convencionais de poços (Hampson et al, 2005), pois o ambiente fluvial apresenta um elevado grau de heterogeneidade interna e a continuidade lateral das camadas é, muitas vezes, menor que o espaçamento entre os poços (Evans et al, 2007). Por esses motivos, a análise de afloramentos auxilia a interpretação da arquitetura fluvial.…”

Section: Aplicação Da Gamaespectrometria Em Depósitos Fluviaisunclassified

“…North e Boering (1999) afirmaram que não é possível definir ambientes deposicionais continentais através da gamaespectrometria, pois há muitas sobreposições entre as litofácies eólicas e fluviais. Evans et al (2007) atentaram para a verificação de minerais radioativos nas camadas de arenitos, que podem alterar a interpretação dos dados gamaespectrométricos.…”

Section: Aplicação Da Gamaespectrometria Em Depósitos Fluviaisunclassified