ASSESSMENT OF HYDROCARBON POTENTIAL OF THE LOWER PALAEOZOIC STRATA IN THE TARNOGROD-STRYI AREA (SE POLAND AND WESTERN UKRAINE)

作者：Wieclaw Dariusz^*; Kosakowski Pawel; Kotarba Maciej J; Koltun Yuriy V; Kowalski Adam

来源：Annales Societatis Geologorum Poloniae, 2012, 82(1): 65-80.

• source rock
• hydrocarbon potential
• Cambrian
• Ordovician
• Silurian
• Carpathian Foredeep basement
• SE Poland
• western Ukraine

Quantity, genetic type and maturity of organic matter dispersed in the Lower Palaeozoic sequence from the Lower Cambrian to Silurian strata of the Polish and Ukrainian parts of the Carpathian Foredeep basement in the Tarnogrod-Stryi area were evaluated based on the results of geochemical analyses of 475 rock samples collected from 45 wells. The best source rocks were found in the Silurian strata where the present to tal organic carbon (TOC) content is up to 2.6 wt%. They occur in the vicinity of Wola Obszanska, where the me dian of the present and the initial to tal organic carbon (TOC) con tents in the individual wells amount to 0.98 and 1.6 wt%, respectively. The Cambrian and Ordovician strata have a poorer hydrocarbon potential and their present TOC con tent never exceeds 1 wt%. In all of the investigated Lower Palaeozoic strata, organic matter is represented by the oil-prone Type-II kerogen deposited in anoxic or sub-oxic conditions. The maturity of source rocks ranges from early mature (the initial phase of the low-temperature thermogenic processes) in selected zones of the Silurian strata in the vicinity of Wola Obszanska, through the middle and the final phase of %26quot;oil window%26quot; in the Ordovician and Cambrian strata in the Polish part of the study area, to the overmature stage in the Ordovician strata in the south-east ern part of the study area (Ukraine).

• 出版日期2012