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Thermal maturity of Silurian deposits in the Baltic Syneclise (onshore Polish Baltic Basin); contribution to unconventional resources assessment

Chiara Caricchi, Sveva Corrado, Lea Di Paolo, Luca Aldega and Domenico Grigo
Thermal maturity of Silurian deposits in the Baltic Syneclise (onshore Polish Baltic Basin); contribution to unconventional resources assessment
Italian Journal of Geosciences (October 2016) 135 (3): 383-393

Abstract

Shale gas is envisaged to contribute in the next future to the European energy mix in the prospective of lowering CO (sub 2) emissions. Poland is by far one of the most perspective countries in Europe. In the "Golden Belt", potential productive levels are Early Paleozoic in age and the reliable assessment of their thermal maturity is crucial for evaluating hydrocarbon generation/expulsion scenarios. When exploring Lower Paleozoic targets that are devoid of vitrinite macerals, uncertainties in thermal maturity evaluation can occur according to commonly adopted parameters (e.g., vitrinite reflectance). These uncertainties can negatively influence targets assessment. We adopted a multi-method approach to assess thermal maturity of the Silurian sections encountered in three wells deep between 2.9 and 3.3 km, recently drilled in the Polish Baltic Basin. The methodological strategy consists of: (i) measurement of organoclasts (mainly graptolites) reflectance; (ii) FT-IR spectroscopy on bulk dispersed organic matter; (iii) X-ray diffraction on <2 mu m grain-size fraction of sedimentary core samples. Organoclasts reflectance is between 0.6 and 1.4% indicating a large range of thermal maturity spanning from early to late mature stages of hydrocarbon generation. Mixed layers illite-smectite and FT-IR indexes (e.g. CH (sub 2) /CH (sub 3) , A and C) allowed us to improve the definition of thermal maturity of Lower Paleozoic rocks (R (sub oeq) between 0.8 and 1.1%). This original dataset indicates lower levels of thermal maturity than those predicted in pre-existing thermal maturity maps, suggesting that the Silurian sections experienced thermal maturity conditions equivalent to the oil window more than the gas window.


ISSN: 2038-1719
EISSN: 2038-1727
Coden: BOGIAT
Serial Title: Italian Journal of Geosciences
Serial Volume: 135
Serial Issue: 3
Title: Thermal maturity of Silurian deposits in the Baltic Syneclise (onshore Polish Baltic Basin); contribution to unconventional resources assessment
Affiliation: Universita Roma Tre, Dipartimento di Scienze, Rome, Italy
Pages: 383-393
Published: 201610
Text Language: English
Publisher: Societa Geologica Italiana, Rome, Italy
References: 59
Accession Number: 2016-074640
Categories: Economic geology, geology of energy sourcesSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch map
N50°00'00" - N55°00'00", E12°30'00" - E21°30'00"
Secondary Affiliation: Eni, ITA, ItalySapienza Universita di Roma, ITA, Italy
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societa Geologica Italiana. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201636
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