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Journal of Petroleum Geology
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DIAGENESIS OF SILURIAN REEFAL CARBONATES, KUDIRKA OILFIELD, LITHUANIA
N. Stentoft, P. Lapinskas, P. Musteikis
EXTENSIONAL EVOLUTION OF THE GULF OF MEXICO BASIN AND THE DEPOSITION OF TERTIARY EVAPORITES
H. Hugh Wilson
UPPER TRIASSIC-MIDDLE JURASSIC STRATIGRAPHY AND SEDIMENTOLOGY IN THE NE QAIDAM BASIN, NW CHINA: PETROLEUM GEOLOGICAL SIGNIFICANCE OF NEW OUTCROP AND SUBSURFACE DATA
Yang Yongtai, B. Ritts, Zou Caineng, Xu Tianguang, Zhang Baomin, Xi Ping
BURIAL HISTORY RECONSTRUCTION AND THERMAL MODELLING AT KUH-E MOND, SW IRAN
M. R. Kamali, M. R. Rezaee
THE GEOCHEMICAL COMPOSITION OF OILS FROM PALAEOZOIC RESERVOIRS IN THE SE WEST SIBERIAN BASIN
O. V. Serebrennikova, T. Ju. Filippova, V.P. Devyatov, We present organic geochemical data (vanadyl, Ni-porphyrin contents, pristane/ phytane ratios, n-alkane compositions) relating to oils from Palaeozoic reservoirs in the SE West Siberian Basin. Analogous data from organic material in Palaeozoic and overlying Jurassic source rocks is also presented. The Jurassic succession here consists of siliciclastic units deposited during alternating marine transgressions, regressions. Our results indicate that vanadyl, Ni-porphyrins occur predominantly in transgressive units, that pristane/phytane ratios increase progressively up through the Jurassic section. However, for Jurassic sediments in which vanadyl porphyrins are present, the Pr/ Ph ratio is strongly facies dependent, is relatively high in transgressive units and lower in regressive units. By contrast, (C +C +C are in deposits 21 23 25)/3C n-alkane low transgressive higher 20 ratios relatively and in regressive deposits. There is a close relationship between this parameter, Pr/Ph ratio. Oils from weathered Palaeozoic reservoirs have variable compositions. In most cases, these compositions appear to be influenced by the depositional characteristics of the overlying Jurassic source intervals. Our data point to a mainly Jurassic origin for the oils in SE Western Siberia. However there is some evidence that a Palaeozoic source may be significant in the south of the studied area.
THE DISTRIBUTION OF LIGHT HYDROCARBONS IN WESTERN NIGER DELTA OILS
C. I. Eneogwe