scholarly journals Stable carbon isotope compositions of isoprenoid chromans in Cenozoic saline lacustrine source rocks from the Western Qaidam Basin, NW China: Source implications

2011 ◽  
Vol 57 (9) ◽  
pp. 1013-1023 ◽  
Author(s):  
YongDong Zhang ◽  
AiZhu Jiang ◽  
YongGe Sun ◽  
LiuJuan Xie ◽  
PingXia Chai
Keyword(s):  
Carbon Isotope ◽  
Qaidam Basin ◽  
Stable Carbon Isotope ◽  
Source Rocks ◽  
Stable Carbon ◽  
Nw China ◽  
Western Qaidam Basin ◽  
Saline Lacustrine

scholarly journals The occurrence and significance of C25HBI in Cenozoic saline lacustrine source rocks from the Western Qaidam Basin, NW China

2011 ◽  
Vol 56 (13) ◽  
pp. 1390-1398 ◽  
Author(s):  
YongDong Zhang ◽  
YongGe Sun ◽  
LiuJuan Xie ◽  
AiZhu Jiang ◽  
PingXia Chai
Keyword(s):  
Qaidam Basin ◽  
Source Rocks ◽  
Nw China ◽  
Western Qaidam Basin ◽  
Saline Lacustrine

scholarly journals Biomarker Ratios and Stablecarbon Isotopes to Describe Crude Oils Characteristics in the Murzuq Basin (Libya)

2019 ◽  
pp. 1-12
Author(s):  
S. Aboglila ◽  
A. Abdulgader ◽  
A. Albaghdady ◽  
O. Hlal ◽  
E. Farifr
Keyword(s):  
Mass Spectrometry ◽  
Carbon Isotope ◽  
Isotope Ratio ◽  
Stable Carbon Isotope ◽  
Source Rocks ◽  
Bacterial Degradation ◽  
Gas Chromatography Mass Spectrometry ◽  
Crude Oils ◽  
Stable Carbon ◽  
Lower Palaeozoic

This present paper includes a detailed evaluation of specific biomarkers together with stable carbon isotope (δ13C) by gas chromatography-mass spectrometry (GC–MS) and Gas Chromatograph–Isotope Ratio Mass Spectrometry (GC–IR–MS). Eight crude oil samples were collected from the A, B, H (east) and H (west) Fields, located in the Murzuq Basin, Libya. Stable Carbon isotope data (δ13C) together with biomarker ratios data of individual hydrocarbons, n-alkanes, isoprenoids, terpenes, hopanes, steranes and aromatic have been determined in crude oils to delineate their bacterial degradation, source facies, organic matter precursors, depositional conditions and a variation of maturation. Based on source-specific parameters including n-C19 alkane, % C27S, %C28S, %C29S, %C23TT, %C30αβ, %rC28, DBT/P, CPI, Pr/Ph, Ts/Tm, dh 30/h 30, 1 MN, 2 MN,         26-27 DMN, 15 DMN, 236 TMN, 146-135 TMN, 125 TMN, 136 TMN ratios and δ13C‰ of saturates and aromatics fractions. Such oils showed non-biodegradation, n-C19 peak proved oils generated from a Lower Palaeozoic source rocks as emphasizedvian-C19 peak, the dominance of C29steranes over C27 and C28 with light Carbon isotope ratio (δ13C‰) values. The abundances of isosterane C29, C27, C28.Tricyclohexaprenol and bacteriohopane polyols and aminopolyols, recommended as mixture bioprecursors of tricyclic terpenes and hopanes, furthermore regular sterane ratio gives values characteristic of Lower Palaeozoic marine source rocks and holding green algae and most likely a quantity of contribution from acritarchs. Carbon preference indices (CPIs)>0.9 pointed to an anoxic deposition, dibenzothiophene to phenanthrene (DBT/Prange 0.49 - 0.58) recommend a siliciclastic source rather than carbonate and/or evaporate saline deposition. The ratios of CPIs, pristane/n-C17 and phytane/n-C18, n-alkanes (C16 to C22) against (C23 to C33), Ts/Tm, C30diahopane/C30hopane, methylnaphthalene, dimethyl naphthalene and trimethyl naphthalene indicated that the oils analysed are mature except the B Field oil being slightly less mature than the A, H (east) and  H (west) Fields oils.

scholarly journals Petroleum Geochemistry Regional Study of Murzuq Basin: Insights from Biomarkers Characteristic, Stable Carbon Isotope and Environmental Characterization

2020 ◽  
Vol 4 (1) ◽  
pp. 1-14
Author(s):  
Aboglila S
Keyword(s):  
Carbon Isotope ◽  
Vitrinite Reflectance ◽  
Stable Carbon Isotope ◽  
Source Rocks ◽  
Crude Oils ◽  
Type I ◽  
Stable Carbon ◽  
Potential Source ◽  
Geochemical Parameters ◽  
Rock Eval

This search aims to apply developed geochemical methods to a number of oils and source rock extracts to better establish the features of ancient environments that occurred in the Murzuq basin. Geochemical and geophysical approaches were used to confirm further a source contribution from other Paleozoic formations to hydrocarbon accumulations in the basin. One hundred and forty rock units were collected from B1-NC151, D1-NC174, A1-NC 76, D1-NC 151, F1-NC58, A1-NC 186, P1-NC 101, D1-NC 58, H1-NC58 and A1-NC58 wells. Seven crude oils were collocated A1-NC186, B1-NC186, E2-NC101, F3-NC174, A10-NC115, B10-NC115 and H10-NC115 wells. A geochemical assessment of the studied rocks and oils was done by means of geochemical parameters of total organic carbon (TOC), Rock-Eval analysis, detailed-various biomarkers and stable carbon isotope. The TOC values from B1-NC151 range 0.40% to 8.5%, A1-NC186 0.3% and 1.45, A1-NC76 0.39% to 0.74%, D1-NC151 0.40% to 2.00% to F1-NC58 0.40% to 1.12%. D1_NC174 0.30% to 10 %, P1-NC101 0.80% to 1.35%, D1-NC58 0.5% to 1.10%, H1-NC58 0.20% to 3.50%, A1-NC58 0.40% to 1.60%. The categories of organic matter from rock-eval pyrolysis statistics point to that type II kerogen is the main type, in association with type III, and no of type I kerogen recognized. Vitrinite reflectance (%Ro), Tmax and Spore colour index (SCI) as thermal maturity parameters reflect that the measured rock units are have different maturation levels, ranging from immature to mature sources. acritarchs distribution for most samples could be recognized and Palynomorphs are uncommon. Pristane to phytane ratios (> 1) revealed marine shale to lacustrine of environmental deposition. The Stable carbon isotope ( δ 13 C) values of seven rock-extract samples are -30.98‰ and -29.14‰ of saturates and -29.86‰ to -28.37‰ aromatic fractions. The oil saturate hydrocarbon fractions range between -29.36‰ to -28.67‰ and aromatic are among -29.98 ‰ to -29.55 ‰. The δ 13 C data in both rock extractions and crude oils are closer to each other, typical in sign of Paleozoic age. It is clear that the base of Tanezzuft Formation (Hot shale) is considered the main source rocks. The Devonian Awaynat Wanin Formation as well locally holds sufficient oil prone kerogen to consider as potential source rocks. Ordovician Mamuniyat Formation shales may poorly contain oil prone kerogen to be addressed in future studies. An assessment of the correlations between the oils and potential source rocks and between the oils themselves indicated that most of the rocks extracts were broadly similar to most of the oils and supported by carbon stable isotope analysis results.

scholarly journals Petrologic and geochemical characteristics of high-quality saline lacustrine source rocks in western Qaidam Basin

2018 ◽  
Vol 3 (4) ◽  
pp. 359-369
Author(s):  
Bin Zhang ◽  
Yuanyuan He ◽  
Yan Chen ◽  
Qingyang Meng ◽  
Jiaxuan Huang ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Geochemical Characteristics ◽  
Source Rocks ◽  
High Quality ◽  
Western Qaidam Basin ◽  
Saline Lacustrine

Geochemical Characteristics of the Paleogene and Neogene Saline Lacustrine Source Rocks in the Western Qaidam Basin, Northwestern China

2016 ◽  
Vol 30 (6) ◽  
pp. 4537-4549 ◽  
Author(s):  
Chenglin Liu ◽  
Haohan Li ◽  
Xu Zhang ◽  
Shijing Zheng ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Geochemical Characteristics ◽  
Source Rocks ◽  
Northwestern China ◽  
Western Qaidam Basin ◽  
Saline Lacustrine

How to find high-quality petroleum source rocks in saline lacustrine basins: A case study from the Cenozoic Qaidam Basin, NW China

2020 ◽  
Vol 111 ◽  
pp. 603-623 ◽  
Author(s):  
Pei Guo ◽  
Chiyang Liu ◽  
Luis Gibert ◽  
Lei Huang ◽  
Daowei Zhang ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Source Rocks ◽  
High Quality ◽  
Nw China ◽  
Saline Lacustrine ◽  
Lacustrine Basins

Aromatic isoprenoids from the 25–65Ma saline lacustrine formations in the western Qaidam Basin, NW China

2011 ◽  
Vol 42 (7) ◽  
pp. 851-855 ◽  
Author(s):  
Chunming Zhang ◽  
Yuqing Zhang ◽  
Chunfang Cai
Keyword(s):  
Qaidam Basin ◽  
Nw China ◽  
Western Qaidam Basin ◽  
Saline Lacustrine
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