Origin of hydrocarbons in the Bach Ho field (The Vietnamese shelf)

2021 ◽  
pp. 4-13
Author(s):  
V. Kerimov ◽  
◽  
R. Mustaev ◽  
Vu Nam Hai ◽  
◽  
...  
Keyword(s):  
Organic Matter ◽  
Distinctive Feature ◽  
Sedimentary Rocks ◽  
Crystalline Basement ◽  
Source Rocks ◽  
Sedimentary Sequences ◽  
Geochemical Study ◽  
The World ◽  
Sedimentary Source ◽  
Hydrocarbon Distribution

This article presents the results of a geochemical study of oil on the Vietnam shelf (Cuu Long basin), including those in the crystalline basement. The Bach Ho field oils in the basement have a hydrocarbon distribution that is no different than oil of numerous accumulations in Oligocene and Miocene sedimentary sequences. Similar to the organic origin oils of the world, oils from the Bach Ho field lack regular isoprenanes С12 and С17 and cheilanthanes (tri-cyclic terpanes) С22 and С27. A distinctive feature of these oils is a large amount of cheilanthanes С19-С29, and large neo-adiantane to adiantane and hopanes to steranes ratios. All these parameters indicate a large bacterial contribution in the generation of these oils. Studies have shown the similarity between oil biomarker parameters and the organic matter of sedimentary rocks, which supports the organic nature of the oils in the basement fields on the Vietnam shelf. It is shown that the hydrocarbon accumulations in the basement complexes of the Cuu Long basin are in a secondary occurrence, and their origin was the organic matter of the sedimentary source rocks.

Reassessment of the Mesozoic metasedimentary rocks and tectonic setting of Taiwan and the adjacent continental margin of eastern Asia

2016 ◽  
Vol 154 (5) ◽  
pp. 1127-1154 ◽  
Author(s):  
YU WANG ◽  
CHIN-HO TSAI ◽  
LIYUN ZHOU ◽  
YAN QIU ◽  
GUIHUA SUN
Keyword(s):  
Continental Margin ◽  
Tectonic Setting ◽  
Active Continental Margin ◽  
Crystalline Basement ◽  
Detrital Zircons ◽  
Source Rocks ◽  
Metamorphic Belt ◽  
Late Mesozoic ◽  
Sedimentary Sequences ◽  
Se China

AbstractIt remains unclear whether a crystalline basement exists in SE China (including Taiwan), whether the formation of the Tananao metamorphic belt in Taiwan was linked to subduction of the Palaeo-Pacific Plate, and whether the source rocks of the sedimentary sequences in the metamorphic belts are late Mesozoic or Palaeozoic in age. Field investigations and zircon age data in the present study indicate that there is no pre-Palaeozoic gneiss (crystalline basement) in Taiwan (although orthogneisses were produced during deformation and metamorphism of Mesozoic granites), and investigations of the metasediments show that the sedimentary sequences in the Tailuko and Yuli belts are similar. Moreover, LA-ICP-MS dating of detrital zircons from the Pingtan–Dongshan belt in Fujian Province yields a cluster of 206Pb–238U ages at ~ 210–190 Ma, and the Tailuko and Yuli belts in Taiwan have similar clusters of detrital zircon ages at 200 Ma, 160 Ma, 120 Ma and 110 Ma, as well as a later overprinting caused by arc–continent collision. The cathodoluminescence images and trace-element characteristics of the zircons show that they were originally magmatic in origin. This finding, combined with the Hf isotope data, indicates that the sources of sediments in the Tananao belt (Tailuko and Yuli belts) were relatively close to an active continental margin, and that both the Tailuko and Yuli belts have similar sedimentary sources. From the margin of the Chinese mainland to Taiwan, the metasediments seem to represent a continuous sequence of deposits ranging in age from Jurassic to Cretaceous, but with the sediments becoming progressively younger towards the east. It can be inferred that the sediments in the Tailuko and Yuli belts were continental-shelf sequences with sources in SE China.

scholarly journals Permian petroleum system of Lena-Anabar trough - lithological-geochemical studies (at an example of well Ust’-olenek 2370)

2016 ◽  
pp. 71-81
Author(s):  
E. A. Bakay ◽  
M. E. Smirnova ◽  
N. I. Korobova ◽  
D. V. Nadezhkin
Keyword(s):  
Organic Matter ◽  
Source Rocks ◽  
Petroleum Potential ◽  
Marine Organic Matter ◽  
Geochemical Study ◽  
Study Results ◽  
Core Descriptions ◽  
Geochemical Studies ◽  
First Time ◽  
Sand Bodies

Lithofacies of different genesis were determined within the Permian sequence, basing on analysis of core descriptions. The best reservoirs are associated with deltaic sand bodies. Permian source rocks with marine organic matter were distinguished. Initial organic matter parameters were estimated, initial good-excellent petroleum potential was suggested. Lithological-geochemical study results for core samples from one of the northern wells of Laptev Sea coast are published for the first time.

scholarly journals Geochemistry of neoprotherosoic organic matter in the southeast of the Siberian platform

Georesursy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 41-54
Author(s):  
Irina D. Timoshina ◽  
Lyudmila N. Boldushevskaya
Keyword(s):  
Organic Matter ◽  
Distinctive Feature ◽  
Siberian Platform ◽  
Homologous Series ◽  
Depositional Environments ◽  
Source Rocks ◽  
Thermal Maturity ◽  
Maturity Level

In the Neoproterozoic of the Aldan-Maya depression, the rocks of the Malgin (MF), Tsipanda (TF) and Kumakha (KF) Formations are enriched in organic matter (OM) and can be classified as source rocks. High generation potential is typical for the MF and TF (267–511 mg HC/g TOC). The thermal maturity level of OM corresponds to MC12 grade (Tmax is 438–443ºC). Based on the biomarker distribution, the biological precursors of OM in these formations are mostly prokaryotes, including cyanobacteria (hopanes, acyclic biomarkers) and to a lesser extent eukaryotes (the presence of steranes С27-C30) that lived in the Precambrian (the presence of 12- and 13-monomethylalkanes) marine (absence of continental biomarkers, the distributions of acyclic alkanes and steranes) basin with clayey sedimentation (high content of diasteranes). The absence of steranes in some samples (the absence of eukaryotes in the source OM), the MF is likely to have been partly deposited before the emergence of eukaryotes. Most samples have elevated concentrations of low-molecular tricyclanes (2C19-20/C23-26>1), which can be attributed to the specificity of the source biota, although it is not typical for marine OM. A rare homologous series of 2,7-dimethylalkanes that has been recently found by other researchers in some Precambrian strata is present in several samples of the MF and KF and totally absent from all samples of the TF. This may indicate the differences in its biota, depositional environments or its evolution during diagenesis and catagenesis. A distinctive feature of the TF is the high content of ethylcholestanes (C29/C27=2.5).

NEW APPROACHES TO DETECTION AND CORRECTION OF SUPPRESSED VITRINITE REFLECTANCE

1997 ◽  
Vol 37 (1) ◽  
pp. 524 ◽  
Author(s):  
J. Newman
Keyword(s):  
Organic Matter ◽  
Vitrinite Reflectance ◽  
Sedimentary Rocks ◽  
Nitrogen Atmosphere ◽  
Source Rocks ◽  
Coal Seams ◽  
A New Technique ◽  
Thermal Indicators ◽  
Bulk Chemistry ◽  
Made In

Vitrinite reflectance is commonly used as an indicator of thermal history and the likely maturity of source rocks. However, comparison of reflectance with other thermal indicators, and assessment of downhole gradients, indicate that vitrinites sometimes have anomalously low reflectance. This phenomenon is referred to as suppression, and can affect vitrinite in both marine and terrestrial sedimentary rocks, and in coal seams. For coals it is possible to diagnose and correct reflectance suppression using bulk chemistry; however, dispersed organic matter in sedimentary rocks requires a petro- logical approach. Therefore, a new technique has been developed combining reflectance with quantitative vitrinite fluorescence (VRF). A VRF plot allows objective differentiation of sedimentary Type III and IV organic matter into suppressed vitrinite, normal vitrinite, recycled vitrinite, and inertinite, based on graphical relationships. This takes the guesswork out of vitrinite identification and overcomes the problem of suppression. Measurements are made in a nitrogen atmosphere to avoid fluorescence alteration. Examples of VRF plots show that fresh samples are not essential for vitrinite fluorescence, as previously assumed.

الجامعة الاسلامية العالمية بماليزيا وودورها فى تعليم اللغة العربية للناطقين بغيرها International Islamic University of Malaysia and Its Role in Teaching Arabic to Non-Native Speakers

2014 ◽  
Vol 10 (2) ◽  
pp. 66
Author(s):  
علاء حسنى المزين (Alaa Hosni)
Keyword(s):  
Distinctive Feature ◽  
Native Speakers ◽  
Arabic Language ◽  
Strong Connection ◽  
Positive Effects ◽  
The World ◽  
Islamic Identity ◽  
Islamic Civilization ◽  
The University ◽  
Scientific Documentation

كان من أهم الآثار الإيجابية للصحوة الإسلامية التى عمت العالم الإسلامى بشكل ملحوظ منذ أوائل السبعينيات فى القرن العشرين زيادة إقبال الشعوب الإسلامية على تعلم اللغة العربية، وبدأ الاهتمام الحقيقى لجامعات العالم الإسلامى بتوفير مساقات متخصصة لهذا الغرض منذ أوائل الثمانينات، وكانت الجامعة الإسلامية العالمية بماليزيا التى أسست سنة 1983 من أنشط الجامعات فى هذا الصدد، وهو نشاط استلفت نظر الباحث إذ وجده يستحق الرصد والتوثيق العلمى، والمراجعة إذا اقتضت الضرورة لا بهدف الإشادة بالتجربة بل رغبة فى الإفادة والاستفادة من قبل المختصين من المهتمين بهذا الميدان الحيوى من ميادين خدمة اللغة العربية بل خدمة الإسلام، وحضارته نظرا للارتباط الوثيق بين اللغة العربية وهذا الدين الحنيف باعتبارها لغة كتابه الخالد، والمعلم الرئيس من معالم الهوية الإسلامية المميزة والصمود الحضارى.*****************************************************One of the most positive effects of the Islamic awakening since the early seventies, in the twentieth century, which spread across the Islamic world in a significant manner, has been the increased Muslims’ interest in learning the Arabic language all over the world. There began a real interest in the universities of the Muslim world for the Arabic language by providing specialized courses for this purpose since the early eighties and  the International Islamic University Malaysia established in 1983 has been the most active university in this regard. And this activity of the university drew the interest of the researcher who found it worthy of investigation and scientific documentation as well as of revision, if necessary, not in order to pay tribute to the experience, but for taking advantage and learning from specialists interested in this vital field of the fields of Arabic language service which is actually service of Islam and its civilization considering the strong connection between Islam and the Arabic language, the language of the Qur’Én , the most distinctive feature of Islamic identity and resilience of Islamic civilization.

scholarly journals Effective source rock selection and oil–source correlation in the Western Slope of the northern Songliao Basin, China

2021 ◽  
Vol 18 (2) ◽  
pp. 398-415
Author(s):  
He Bi ◽  
Peng Li ◽  
Yun Jiang ◽  
Jing-Jing Fan ◽  
Xiao-Yue Chen
Keyword(s):  
Organic Matter ◽  
Source Rock ◽  
Thermal Evolution ◽  
Songliao Basin ◽  
Source Rocks ◽  
Crude Oils ◽  
Western Slope ◽  
Geochemical Parameters ◽  
Group I ◽  
Oil Source

AbstractThis study considers the Upper Cretaceous Qingshankou Formation, Yaojia Formation, and the first member of the Nenjiang Formation in the Western Slope of the northern Songliao Basin. Dark mudstone with high abundances of organic matter of Gulong and Qijia sags are considered to be significant source rocks in the study area. To evaluate their development characteristics, differences and effectiveness, geochemical parameters are analyzed. One-dimensional basin modeling and hydrocarbon evolution are also applied to discuss the effectiveness of source rocks. Through the biomarker characteristics, the source–source, oil–oil, and oil–source correlations are assessed and the sources of crude oils in different rock units are determined. Based on the results, Gulong and Qijia source rocks have different organic matter primarily detrived from mixed sources and plankton, respectively. Gulong source rock has higher thermal evolution degree than Qijia source rock. The biomarker parameters of the source rocks are compared with 31 crude oil samples. The studied crude oils can be divided into two groups. The oil–source correlations show that group I oils from Qing II–III, Yao I, and Yao II–III members were probably derived from Gulong source rock and that only group II oils from Nen I member were derived from Qijia source rock.

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