English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The U.S. Geological Survey (USGS) quantitatively assessed the potential for undiscovered, technically recoverable continuous (unconventional) shale-oil and associated gas resources in the Putumayo-Oriente-Marañón Basin Province (fig. 1). The development of several petroleum systems in this basin is related to the tectonic history of the western margin of South America (Wolaver and others, 2015; Calderon and others, 2017). Back-arc extension in the Permian and Early Triassic formed rift basins with synrift deposits that include organic-rich shales of the Permian Ene Formation (Boekhout and others, 2018). In the Triassic and Jurassic, back-arc marine conditions led to the deposition of organic-rich, carbonate-based marine shales of the Pucara Formation (Baby and others, 2006; Chalco and Valencia, 2008; Yinfu and others, 2010). In the Late Cretaceous, a passive margin existed along a large portion of the central and northwestern margin of South America, where organic-rich shales of the La Luna Formation and equivalents such as the Villeta Shale and Napo Shale were deposited. Renewed subduction in the Paleogene led to the formation of a complex fold and thrust belt and an adjacent foreland basin on the former passive margin (fig. 2). As sediments accumulated in the Paleogene foreland basin, organic-rich shales of Permian, Triassic–Jurassic, and Late Cretaceous age reached thermal maturity for oil generation. Following generation, long-distance migration of oil took place from west to east in the Paleogene foreland, where source rocks are thermally immature. In the

Assessment of continuous oil and gas resources of the Putumayo-Oriente-Marañón Basin Province of Colombia, Ecuador, and Perú, 2018