{'fraction_non_alphanumeric': 0.04224137931034483, 'fraction_numerical': 0.026724137931034484, 'mean_word_length': 5.8698224852071, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Assessment of Undiscovered Petroleum Resources of the North and East Margins of the Siberian Craton, Russian Federation

In 2007, the U.S. Geological Survey (USGS) completed an assessment of potential undiscovered, technically recoverable (assuming the absence of sea ice) crude oil, natural gas, and natural gas liquids (collectively referred to as petroleum) resources in the Yenisey-Khatanga Basin, Lena-Anabar Basin, Lena-Vilyui Basin (northern part), and the Zyryanka Basin Provinces of the Russian Federation (fig. 1). As with other areas and basins assessed in the USGS Circum-Arctic Oil and Gas Resource Appraisal (CARA) program, this area shares important characteristics with many Arctic basins, including sparse data, significant petroleum-resource potential, geologic uncertainty, and technical barriers that impede exploration and development. As defined for CARA, the Yenisey-Khatanga Basin Province includes approximately 391,000 km2; the LenaAnabar Basin Province, approximately 125,000 km2; the northern Priverkhoyansk part of the Lena-Vilyuy Basin Province, approximately 55,000 km2, and the Zyryanka Basin Province, approximately 56,000 km2.