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Zastosowanie technik geochemii powierzchniowej w poszukiwaniu złóż ropy naftowej i gazu ziemnego

Kapusta P.

Prace Instytutu Górnictwa Naftowego i Gazownictwa

2000

nr 110 wyd. konferencyjne

81--85

The past decade has seen a renewed interest in surface geochemical exploration which, together with developments in analytical and interpretative methods, have produced a new body of data and insights that established the validity of many of these exploration methods. Surface exploration methods can not replacc conventional exploration methods, but they can provide a powerful support to them. Geochemical and other surface methods have found their greatest utility when used in conjunction with available geological and geophysical information. Properly acquired and analyzed, the combination of surface geochemical data and subsurface exploration data has the potential to reduce exploration and development risk and costs by improving success rate and shortening development time.

A study of organic matter and habitat of gaseous hydrocarbons in the Miocene strata of the Polish part of the Carpathian Foredeep

Kotarba M.J., Wilczek T., Kosakowski P., Kowalski A., Więcław D.

Przegląd Geologiczny

1998

Vol. 46, nr 8/2

742-750

Geochemical studies on the organic matter from the autochthonous Miocene strata of the Carpathian Foredeep demonstrated the presence of gas-prone type 111 kerogen in both the Upper Badenian and Lower Sarmatian sediments with rare admixtures of algal type II kerogen. The TOC contents vary from 0.02 to 3.22 wt. %. Down to the depth 3,200 meters the organic matter is immature. Its transformation degree corresponds to the vitrinite reflectance R,,from 0.25 to 0.6% and to the Rock Eval Tmax temperatures from 415 to 438" C. Insignificant variability in spatial and depth distribution of geochemical parameters and indices (TOC, TE/TOC, Tmax, HI, R<>, CPI, etc.) suggest that deposition conditions of the organic matter were generally homogenous within the full thickness of Miocene sequence down to the recent depth about 3,200 meters. Such conditions resulted in the lack of diversity of the TOC, the genetic type and the transformation degree of the studied kerogen. The Miocene terrestrial OM is immature and generated almost exclusively the microbial methane. The low-temperature thermogenic processes have been active beneath the depth about 3,200 meters i.e., mainly under the Carpathian overthrust.