TY - JOUR
T1 - Oil family typing, biodegradation and source rock affinity of liquid petroleum in the Danish North Sea
AU - Petersen, H.I.
AU - Hertle, M.
AU - Juhasz, A.
AU - Krabbe, H.
N1 - Publisher Copyright:
© 2016 The Authors. Journal of Petroleum Geology © 2016 Scientific Press Ltd.
PY - 2016/7/1
Y1 - 2016/7/1
N2 - Variations in liquid petroleum compositions in the Danish Central Graben and Siri Fairway, North Sea, demonstrate the presence of several active source rock facies. To address this issue in detail, a total of 213 samples of liquid petroleum from the Danish Central Graben and the Siri Fairway were typed to eight main oil families and three sub-families based on characteristic geochemical properties and principal component analysis (PCA). Comparison with source rock extract data made it possible to suggest correlative source rocks for each oil family together with the source rock depositional environments. The main oil families are: 1(B), 2(B), 3a(B), 3b(B), 4(B-D/E), 5(D/E-B), 6(D/E-F) and 7(A), where the capital letters in brackets refer to the organofacies types of Pepper and Corvi (1995), thus directly linking the oil family type to the source rock facies. Oil families 1(B), 2(B), 3a(B) and 3b(B) were charged from marine shales (principally the Upper Jurassic Farsund Formation); oil families 4(B-D/E) and 5(D/E-B) are mixed petroleums with both terrigenous and marine components; oil family 6(D/E-F) was charged from Middle Jurassic coaly units; whereas oil family 7(A) was charged from a carbonate source (Zechstein dolomites). Family 7(A) has only been documented in the form of oil stains. The most widespread oil family is 3a(B), sourced from Upper Jurassic marine shales. Charging from different organofacies is indicated by oil family 3b(B), which was derived from parts of the same shale succession which were more terrigenous-influenced and possibly slightly more oxic; and families 2(B) and 1(B), which were sourced from more organic-rich, anoxic parts of the shales. Mildly biodegraded oils (Level 1 to 2) appear mainly to occur in the central to southern parts of the Danish Central Graben.
AB - Variations in liquid petroleum compositions in the Danish Central Graben and Siri Fairway, North Sea, demonstrate the presence of several active source rock facies. To address this issue in detail, a total of 213 samples of liquid petroleum from the Danish Central Graben and the Siri Fairway were typed to eight main oil families and three sub-families based on characteristic geochemical properties and principal component analysis (PCA). Comparison with source rock extract data made it possible to suggest correlative source rocks for each oil family together with the source rock depositional environments. The main oil families are: 1(B), 2(B), 3a(B), 3b(B), 4(B-D/E), 5(D/E-B), 6(D/E-F) and 7(A), where the capital letters in brackets refer to the organofacies types of Pepper and Corvi (1995), thus directly linking the oil family type to the source rock facies. Oil families 1(B), 2(B), 3a(B) and 3b(B) were charged from marine shales (principally the Upper Jurassic Farsund Formation); oil families 4(B-D/E) and 5(D/E-B) are mixed petroleums with both terrigenous and marine components; oil family 6(D/E-F) was charged from Middle Jurassic coaly units; whereas oil family 7(A) was charged from a carbonate source (Zechstein dolomites). Family 7(A) has only been documented in the form of oil stains. The most widespread oil family is 3a(B), sourced from Upper Jurassic marine shales. Charging from different organofacies is indicated by oil family 3b(B), which was derived from parts of the same shale succession which were more terrigenous-influenced and possibly slightly more oxic; and families 2(B) and 1(B), which were sourced from more organic-rich, anoxic parts of the shales. Mildly biodegraded oils (Level 1 to 2) appear mainly to occur in the central to southern parts of the Danish Central Graben.
KW - biodegradation
KW - Danish Central Graben
KW - North Sea
KW - oil family
KW - organofacies
KW - petroleum
KW - Siri Fairway
KW - Source rocks
UR - http://www.scopus.com/inward/record.url?scp=84973889213&partnerID=8YFLogxK
U2 - 10.1111/jpg.12645
DO - 10.1111/jpg.12645
M3 - Article
AN - SCOPUS:84973889213
SN - 0141-6421
VL - 39
SP - 247
EP - 268
JO - Journal of Petroleum Geology
JF - Journal of Petroleum Geology
IS - 3
ER -