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Lithohero: Creating comprehensive sedimentary logs from cores and outcrops

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Abstract

The representation of core and outcrop data in on-scale sedimentary columns is a common practice in modern Geology. Either core or outcrop description involves the observation of a human and the related annotations. The traditional practice consist on sketching at the field or at core facilities and afterwards redrawing the chart at the lab. Conventional methodology is not only demanding in terms of time, but also extremely sensible to human errors. In this work a successful case of consistent core and outcrops representation is presented. The differential factor was the use of LithoHero software. The use of mobile devices and the instant graphical representation of the annotations reduces drastically the potential mistakes, minimizes the required time, and simplifies the process. A practical example on Vaca Muerta Formation is presented. Finally, a successful import to Petrel Software is showcased.
Core
Outcrop Description Representation
Description Representation
Schlumberger Software
... The stratigraphic sections were measured with a Jacob Staff and positioned by GPS. Over the years, the annotation procedure migrated from the conventional field book towards the digital record using our in-house "LithoHero" software (Iparraguirre et al. 2018). A free version of this software is currently available in Google Play for Android devices. ...
Chapter
Full-text available
Marine sedimentation in the Neuquén Basin started in the Early Jurassic with the accumulation of a progradational clastic system: the Cuyo Group. This sedimentary cycle begins with offshore shales of the Los Molles Formation, transitionally overlaid by shelfal to littoral sandstones and conglomerates of the Lajas Formation. According to the current stratigraphic schema, in the southern Neuquén Basin the Cuyo Group ends with continental red beds of the Challacó Formation, a unit interpreted as being the proximal equivalent of the Lajas Formation. Nevertheless, recent studies performed in the Picún Leufú area, complemented with regional stratigraphic evidence, suggest that the accumulation of these stratigraphic units is more likely related to a complex depositional scenario that involves tectonic activity during the Jurassic along the Huincul Arch. The uplift and exposure of Jurassic rocks along the Huincul Arch divided the basin into two sub-basins, each one having a different stratigraphy for the Middle-Late Jurassic time span. The stratigraphic analysis revealed that the red beds traditionally located at the top of the Cuyo Group in fact represent two different stratigraphic units separated by a regional unconformity. The lower unit (1) sharply overlies the Lajas Formation, corresponding to the Challacó Formation s.s. This unit was accumulated in a brackish lacustrine basin developed southward of the Huincul Arch (Picún Leufú Sub-basin). The upper unit (2) corresponds to the Bosque Petrificado Formation and is stratigraphically located at the base of the Lotena Group. The Bosque Petrificado Formation was accumulated in a fluvial to marine environment developed in the southern Neuquén Basin. Paleocurrent analysis suggests a sediment supply from the northeast, evidencing a local source of sediments related to an uplifted area. Recent biostratigraphic studies performed in the Bosque Petrificado and Lotena formations revealed an Early Callovian-Early Oxfordian age for these deposits.
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