Characterization of subaerial volcanic facies using acoustic image logs: Lithofacies and log-facies of a lava-flow deposit in the Brazilian pre-salt, deepwater of Santos Basin

Fornero, Sofia Alves; Marins, Gabriel Medeiros; Lobo, Janaína Teixeira; Freire, Antônio Fernando Menezes; Lima, Evandro Fernandes de

doi:10.1016/j.marpetgeo.2018.09.029

Cited by 40 publications

(17 citation statements)

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“…The televiewer is most commonly utilized for structural and stress field analysis (e.g., Zoback et al, 1985;Ziegler et al, 2016;Millett et al, 2018); however, the images may also give potentially important information about volcanic facies and intra-facies. The ability for image logs to characterize volcanic facies elements has been highlighted for the FMS and FMI logs (resistivity imaging, Brewer et al, 1998;Tominaga, 2013;Watton et al, 2014a;Fornero et al, 2018); however, similar dedicated studies for the interpretation of volcanic facies from the televiewer appear somewhat limited and of lower apparent image quality to date (e.g., Massiot et al, 2015). Acquisition of high-quality televiewer data formed one of the primary objectives of the Hawai'i borehole operations.…”

Section: Televiewermentioning

confidence: 99%

“…Perhaps some of the most significant developments in the interpretation of volcanic rocks from borehole data have come from the combined Ocean Drilling Program (ODP) and Integrated Ocean Drilling Program (IODP) literature which records the scientific findings of extensive offshore coring programs targeting both the oceanic crust and many of the world's volcanic rifted margins (e.g., Goldberg, 1997;Brewer et al, 1998;Teagle et al, 2012). In more recent years, offshore exploration for hydrocarbons in many of the world's rifted margins has also increased the number of data and studies relating to downhole measurements through volcanic successions (e.g., Nelson et al, 2009Nelson et al, , 2015Andersen et al, 2009;Watton et al, 2014a;Millett et al, 2015;Fornero et al, 2018). In more direct relevance to this study, findings associated with drilling operations on Hawai'i including the over 3 km deep HSDP2 borehole have also led to significant advances in the identification and interpretation of volcanic rocks in the subsurface (e.g., Katz and Cashman, 2003;Garcia et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Lava facies include pāhoehoe, 'a'ā and transitional types on a range of scales. The volcanic sequences comprise basaltic to picritic shield stage lavas of Mauna Kea capped by a thinner sequence of postshield basalt-dominated (Hamakua Volcanics) to hawaiitedominated (Laupahoehoe Volcanics) lavas (Frey et al, 1990). A wireline logging data set including spectral gamma, magnetic susceptibility, dipmeter resistivity, sonic, total magnetic field, temperature and televiewer images was acquired within the open hole interval ca.…”

Section: Introductionmentioning

confidence: 99%

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Understanding volcanic facies in the subsurface: a combined core, wireline logging and image log data set from the PTA2 and KMA1 boreholes, Big Island, Hawai`i

et al. 2019

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Abstract. To help understand volcanic facies in the subsurface, data sets that enable detailed comparisons between down-hole geophysical data and cored volcanic intervals are critical. However, in many cases, the collection of extended core intervals within volcanic sequences is rare and often incomplete due to challenging coring conditions. In this contribution we outline and provide initial results from borehole logging operations within two fully cored lava-dominated borehole sequences, PTA2 and KMA1, on the Big Island of Hawai`i. Data for spectral gamma, magnetic susceptibility, dipmeter resistivity, sonic, total magnetic field, temperature and televiewer wireline logs were successfully acquired for the open hole interval ca. 889 m to 1567 m within the PTA2 borehole. Spectral gamma was also collected from inside the casing of both wells, extending the coverage for PTA2 to the surface and covering the interval from ca. 300 to 1200 m for KMA1. High-quality core material was available for both boreholes with almost complete recovery which enabled high-resolution core-to-log integration. Gamma data are generally low commonly in the range ca. 7–20 gAPI but are shown to increase up to API of ca. 60 with some intrusions and with increases in hawaiite compositions in the upper part of PTA2. Velocity data are more variable due to alteration within porous volcanic facies than with burial depth, with a general degrease down-hole. The high-resolution televiewer data have been compared directly to the core, enabling a comprehensive analysis of the variations in the televiewer responses. This has enabled the identification of key features including individual vesicles, vesicle segregations, strained vesicles, chilled margins, rubble zones, intrusive contacts and pāhoehoe lobe morphologies, which can be confidently matched between the televiewer data and the full diameter core. The data set and results of this study include findings which should enable improved borehole facies analysis through volcanic sequences in the future, especially where down-borehole data and images but no core are available.

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Section: Televiewermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding volcanic facies in the subsurface: a combined core, wireline logging and image log data set from the PTA2 and KMA1 boreholes, Big Island, Hawai`i

et al. 2019

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“…A variety of igneous events have been recognised in the Santos Basin, including Early Cretaceous pre-rift and syn-rift magmatism, pre-salt volcanism, and post-salt magmatic activity, which are mainly dated as Santonian and Eocene [e.g., Fornero et al, 2019;Oreiro et al, 2008].…”

Section: Timing Of Igneous Activitymentioning

confidence: 99%

Salt-magma interactions influence intrusion distribution and salt tectonics in the Santos Basin, offshore Brazil

Magee¹,

Pichel²,

Madden-Nadeau³

et al. 2022

Preprint

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“…Nonetheless, the paleocurrent direction cannot be determined accurately without considering the regional tectonic setting. Sofia Alves Fornero et al [31] established a formation model of historical volcanic activities in Santos Basin, Brazil, based on acoustic imaging logging and geochemical analysis. Their research lays the foundation for evaluating volcanic rock reservoir and modelling the geology in the area.…”

Section: Literature Reviewmentioning

confidence: 99%

A Statistical Method for Lithic Content Based on Core Measurement, Image Analysis and Microscopic Statistics in Sand-conglomerate Reservoir

Chen¹,

Qu²,

Qiu³

et al. 2019

I2M

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The type and content of lithics are of great importance to reservoir research. The existing statistical methods for lithic content mainly focus on sand-level lithics, failing to consider gravel-level lithics. Thus, these methods are not applicable to sand-conglomerate reservoirs, where sand-level and gravel-level lithics coexist. To solve the defects, this paper proposes a hybrid strategy for lithic content in sand-conglomerate reservoirs. Firstly, the type and content of gravel-level lithics were determined through full-bore formation microimager (FMI) imaging logging and core analysis. Next, the type and content of sand-level lithics were obtained by thin-section observation. On this basis, the data on the two levels of lithics were integrated to yield the total content of each type of lithics in the sand-conglomerate reservoir. The hybrid strategy was applied to analyze the lithics features and physical properties of a sand-conglomerate reservoir in the upper part of the fourth member of the Shahejie Formation (upper Es4), north zone, Dongying Depression, China. The results show that the hybrid strategy output greater upper and lower limits of the total lithic contents than the existing methods, and outshined the traditional thin-section observation in accuracy. In the study area, the sand-conglomerate reservoirs in the upper Es4 of the two blocks have different physical properties. The difference is mainly attributable to the different types and contents of lithics of the two blocks. The proposed strategy boasts a strong application potential in oil and gas exploration.

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Characterization of subaerial volcanic facies using acoustic image logs: Lithofacies and log-facies of a lava-flow deposit in the Brazilian pre-salt, deepwater of Santos Basin

Cited by 40 publications

References 17 publications

Understanding volcanic facies in the subsurface: a combined core, wireline logging and image log data set from the PTA2 and KMA1 boreholes, Big Island, Hawai`i

Understanding volcanic facies in the subsurface: a combined core, wireline logging and image log data set from the PTA2 and KMA1 boreholes, Big Island, Hawai`i

Salt-magma interactions influence intrusion distribution and salt tectonics in the Santos Basin, offshore Brazil

A Statistical Method for Lithic Content Based on Core Measurement, Image Analysis and Microscopic Statistics in Sand-conglomerate Reservoir

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