Optical thermal maturity parameters and organic geochemical alteration at low grade diagenesis to anchimetamorphism: A review

2015 ◽  
Vol 150-151 ◽  
pp. 74-119 ◽  
Author(s):  
Christoph Hartkopf-Fröder ◽  
Peter Königshof ◽  
Ralf Littke ◽  
Jan Schwarzbauer
Keyword(s):  
Low Grade ◽  
Thermal Maturity ◽  
Maturity Parameters

scholarly journals Classical Biomarker and Quantitative Extended Diamondoid Analysis Fingerprints for Crude Oils from Deepwater Developments in Block 17, Lower Congo Basin, Angola

2020 ◽  
Vol 17 (19) ◽  
pp. 7204
Author(s):  
Carlos Boente ◽  
Gonzalo Márquez ◽  
Patricia Marín ◽  
Emilio Romero ◽  
Cristina Rodrigues ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Organic Geochemistry ◽  
Hierarchical Cluster ◽  
Molecular Data ◽  
Congo Basin ◽  
Hydrocarbon Generation ◽  
Thermal Maturity ◽  
Maturity Level ◽  
Oil Type ◽  
Maturity Parameters

The organic geochemistry of six oil samples from the offshore Block 17 (Lower Congo Basin, northwestern Angola) was studied by a combination of classical biomarker and extended diamondoid analyses to elucidate source rock facies, the extent of biodegradation, and thermal maturity. Based on molecular data, oils are interpreted as depicting a mixture of two pulses of hydrocarbon generation probably from the Bucomazi and Malembo formations. Geochemical results also gave evidence of mixing of a lacustrine siliciclastic-sourced oil charge and a second more terrestrially derived oil type in the samples analyzed. A single genetic oil family was identified through hierarchical cluster analysis; however, two groups of oils were identified on the basis of their biodegradation levels using the Peters/Moldowan scale. Lower and upper Malembo oils have a slight depletion and a notable absence of n-alkanes, suggesting PM levels of 1 and 2, respectively. Most molecular maturity parameters of the oil samples suggest a maturity level equivalent to the onset of the peak of the oil generative window.

Novel Thermal Maturity Parameters Derived from Alkylbiphenyls and Alkyldiphenylmethanes

2019 ◽  
Vol 33 (9) ◽  
pp. 8491-8502
Author(s):  
Qianru Wang ◽  
Haiping Huang ◽  
Zheng Li ◽  
Zongxing Li
Keyword(s):  
Thermal Maturity ◽  
Maturity Parameters

Biomarker Molecular Indicators Predict Biodegraded Heavy Oil Physical Properties: A Case from Dongying Depression, Eastern China

2012 ◽  
Vol 524-527 ◽  
pp. 2069-2073
Author(s):  
Zhong Hong Chen
Keyword(s):  
Physical Properties ◽  
Eastern China ◽  
Bohai Bay ◽  
Thermal Maturity ◽  
Dongying Depression ◽  
Wide Range ◽  
Biodegraded Oils ◽  
Tricyclic Terpanes ◽  
Molecular Indicators ◽  
Maturity Parameters

To determine reliable molecular thermal maturity parameters for prediction of the physical properties of biodegraded oils, a suite of oils including 11 biodegraded oils from Caoqiao oilfield and 5 non-biodegraded oils from Wangjiagang oilfield in Dongying depression in Bohai-bay basin, eastern of China were analyzed. The oils were selected in a wide range of viscosity in order to investigate the relation between the parameters and oil properties. The data show the effects of biodegradation on some molecular thermal maturity parameters: C29 sterane parameters C2920S/(20S+20R) and C29ββ/(ββ+αα) increased apparently under heavy biodegradation (rank 6~7); parameters C3122S/(22S+22R), C3222S/(22S+22R), C293-methyl/C29 4-methyl, (C28+C29Tricyclics)/Ts and (C28+C29Tricyclics)/ (C28+C29Tricyclics +Ts) showed effects from heavy biodegradation (rank 6~7), and terpanes parameters Ts/(Ts+Tm), C29Ts/(C29Ts+C29Tm) and aromatic C20/(C28+C20), (C20+C21)/(C20+C21+C26+C27+C28) and D(3-6)/(D3-6+ C29 4-methylstigmastane 20R showed no effect from heavy biodegradation. Based on the comparison, the molecular maturity parameters C26 to C28 triaromatic parameters C26S/ (C26S+C28S), C27R/(C27R+C28R), C28/(C26+C27+C28) and tricyclic terpanes parameters C19/(C19+C23) were recommended to predict the physical properties of biodegraded oil for these parameters showed no effects from biodegradation(rank 6~7) and better relations with oil physical properties compared to other parameters. Some quantificational equations between these molecular thermal maturity parameters and the physical properties of biodegraded oils were inferred, which may assist in predicting the viscosity and API gravity of reservoired oils before production.

scholarly journals Evaluating Molecular Evolution of Kerogen by Raman Spectroscopy: Correlation with Optical Microscopy and Rock-Eval Pyrolysis

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1406 ◽  
Author(s):  
Seyedalireza Khatibi ◽  
Mehdi Ostadhassan ◽  
David Tuschel ◽  
Thomas Gentzis ◽  
Humberto Carvajal-Ortiz
Keyword(s):  
Raman Spectroscopy ◽  
Organic Matter ◽  
Structural Information ◽  
Vitrinite Reflectance ◽  
Nondestructive Method ◽  
Thermal Maturity ◽  
Shale Formations ◽  
Reflectance Analysis ◽  
Rock Eval ◽  
Maturity Parameters

Vitrinite maturity and programmed pyrolysis are conventional methods to evaluate organic matter (OM) regarding its thermal maturity. Moreover, vitrinite reflectance analysis can be difficult if prepared samples have no primary vitrinite or dispersed widely. Raman spectroscopy is a nondestructive method that has been used in the last decade for maturity evaluation of organic matter by detecting structural transformations, however, it might suffer from fluorescence background in low mature samples. In this study, four samples of different maturities from both shale formations of Bakken (the upper and lower members) Formation were collected and analyzed with Rock-Eval (RE) and Raman spectroscopy. In the next step, portions of the same samples were then used for the isolation of kerogen and analyzed by Raman spectroscopy. Results showed that Raman spectroscopy, by detecting structural information of OM, could reflect thermal maturity parameters that were derived from programmed pyrolysis. Moreover, isolating kerogen will reduce the background noise (fluorescence) in the samples dramatically and yield a better spectrum. The study showed that thermal properties of OM could be precisely reflected in Raman signals.

Reservoir geochemistry: Evaluation of thermal maturity from gasoline-range hydrocarbons

2015 ◽  
Vol 3 (3) ◽  
pp. SV1-SV7
Author(s):  
Gary H. Isaksen
Keyword(s):  
North Sea ◽  
Vitrinite Reflectance ◽  
Upper Jurassic ◽  
Source Rocks ◽  
Calibration Data ◽  
Thermal Maturity ◽  
Volatile Oils ◽  
Marine Algal ◽  
The Uk ◽  
Maturity Parameters

Oils and condensates with high concentrations of gasoline-range hydrocarbons typically lack adequate quantities of [Formula: see text] biomarkers used for thermal maturity and organic facies evaluations. I attempted a calibration of rock-based thermal maturity parameters between gasoline-range molecular parameters and nonmolecular maturity parameters such as Rock-Eval Tmax, vitrinite reflectance, and downhole temperatures. This enables maturity evaluation of volatile oils and condensates whose biomarker concentrations are at low or trace levels. The rock-based calibration data were used to assess thermal maturity of nonvolatile oils, volatile oils, and condensates from the Central Graben area of the UK North Sea and includes samples from high-pressure (gradients [Formula: see text]) and high-temperature ([Formula: see text]) hydrocarbon systems. Source rocks for theses North Sea oils and condensates are the Upper Jurassic Kimmeridge Clay and Heather shales, with a predominance of marine, algal type II organic matter.

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