Source rock palaeoenvironments and controls on the distribution of dibenzothiophenes in lacustrine crude oils, Bohai Bay Basin, eastern China

Huang, Haiping; Pearson, Michael J.

doi:10.1016/s0146-6380(99)00126-6

Cited by 170 publications

(51 citation statements)

References 32 publications

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“…This basin formed on the top of the North China craton had a complex evolution history (Huang and Pearson, 1999). The basin developed as a back-arc basin during the Mesozoic and evolved into an intracratonic-rifted basin during the Cenozoic.…”

Section: Geological Settingmentioning

confidence: 99%

Depositional system and hydrocarbon accumulation in Gubei slope zone, Zhanhua Depression, Bohai Bay Basin, eastern China

Guo

Jia

Konhauser

2016

Energy Exploration & Exploitation

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The Zhanhua Depression is a hydrocarbon-rich, fault-generated depression in Bohai Bay Basin, eastern China. Gubei slope zone, located in eastern Zhanhua Depression, is an important oil production region. Drilling cores, logging data, and 3D seismic data were used to identify several depositional system infilling the slope zone, including braided-delta, sublacustrine fans, and deep/ semi-deep lake fine-grained deposits and turbidite, all of which are associated with a lacustrine succession belonging to the 3rd member of Shahejie Formation (Es 3 ). Sedimentary rock of Es 3 are composed of mudstone, silty mudstone, fine sandstone, coarse sandstones, and conglomeratic sandstones with various structures including massive bedding, parallel bedding, scour-fill structures, graded bedding, and deformed structures. Sandstone distributed in braided-delta front subfacies, lacustrine fans and some turbidite are favorable reservoir facies. Fault system was an important hydrocarbon migration pathway and sometimes a sealing geologic unit, which played an important role in the formation of commercial oil reservoirs in Gubei slope zone. The commercial oil reservoir is dominantly distributed in ridge-like structures in Gubei slope zone, which give an inspiration that ridge-like structure was probably a very favorable area for hydrocarbon exploration in continental basin slope zone.

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Section: Geological Settingmentioning

confidence: 99%

Depositional system and hydrocarbon accumulation in Gubei slope zone, Zhanhua Depression, Bohai Bay Basin, eastern China

Guo

Jia

Konhauser

2016

Energy Exploration & Exploitation

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“…The variation of the ratios about dibenzothiophene to phnanthrene (DBTH/P) and methyl dibenzothiophene to methyl phenanthrene (MDBTH/MP) are mainly controlled by the properties of the depositional environment and the lithlogical features of source rocks [24,25] . Generally speaking, hypersaline depositional environment is rich in sulfur-containing aromatic hydrocarbons, and fresh depositional environment is characteristic of poor sulfur-containing aromatic hydrocarbons.…”

Section: Variation Of Distributions and The Compositions Of Alkyl Aromentioning

confidence: 99%

The effects of biodegradation on the compositions of aromatic hydrocarbons and maturity indicators in biodegraded oils from Liaohe Basin

Bao

Zhu

2009

Sci. China Ser. D-Earth Sci.

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Citation: Bao J P, Zhu C S. The effects of biodegradation on the compositions of aromatic hydrocarbons and maturity indicators in biodegraded oils from Liaohe Basin. By the aid of GC-MS technique, a series of sequentially biodegraded oils from Liaohe Basin have been analyzed. The results show that the concentrations and relative compositions of various aromatic compounds in the biodegraded crude oils will change with increasing biodegradation degree. The concentrations of alkyl naphthalenes, alkyl phenanthrenes, alkyl dibenzothiophene are decreased, and the concentration of triaromatic steroids will increase with increasing biodegradation degree in biodegraded oils. Those phenomena indicate that various aromatic compounds are more easily biodegraded by bacteria like other kinds of hydrocarbons such as alkanes, but different series of aromatic compounds have a varied ability to resistant to biodegradation. The ratios of dibenzothiophene to phenenthrene (DBTH/P) and methyl dibenzothiophene to methyl phenanthrene (MDBTH/MP) are related to the features of depositional environment for source rocks such as redox and ancient salinity. However, in biodegraded oils, the two ratios increase quickly with the increase of the biodegradation degree, indicating that they have lost their geochemical significance. In this case, they could not be used to evaluate the features of depositional environment. Methyl phenanthrene index, methyl phenanthrene ratio and methyl dibenzoyhiophene ratio are useful aromatic maturity indicators for the crude oils and the source rocks without vitrinite. But for biodegraded oils, those aromatic maturity indicators will be affected by biodegradation and decrease with the increase of the biodegradation degree. Therefore, those aromatic molecular maturity indicators could not be used for biodegraded oils.biodegraded oils, alkyl phenanthrenes, alkyl dibenzothiophenes, aromatic maturity indicator, Liaohe Basin

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“…Therefore, both Source rock maturity is another important control factor for wax generation and preservation. The maturity of source rock in the Damintun depression is not very high, ranging from low mature to marginal mature [23]. The vitrinite reflectance (R a ) ranges from 0.44% to 0.79%.…”

Section: Geological Background and Sample Analysismentioning

confidence: 99%

“…The maximum burial depth of the ES 4 source rock is less than 3500 m and the vitrinite reflectance is less than 0.8%, whilst the normal oil distributed south part of the depression undergoes higher thermal evolution. The maximum burial depth of the ES 3 source rock is more than 4000 m and the vitrinite reflectance reaches about 1.0% [19,23]. This is coincident with high wax oil spatial distribution.…”

Section: Geological Background and Sample Analysismentioning

confidence: 99%

Lacustrine biomass: An significant precursor of high wax oil

et al. 2003

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Although a variety of precursors have been proposed for the formation of high molecular weight hydrocarbons (HMWHCs) in crude oil, their precise origin remains elusive. Quantitative studies of macrocrystalline wax and microcrystalline wax content of source rock extracts from the Damintun depression, Liaohe Basin, a typical high wax producing area, coupled with microscopical maceral composition studies and pyrolysis-GC analysis indicate that oil shale enriched in lacustrine biomass makes a primary contribution to wax in oil. The main precursors of high wax oil are lacustrine alginites and their amorphous matrix, which are highly aliphatic in nature and have high generative potential for HMWHCs. Wax generation efficiency could be affected by organic material abundance and maturity. The high abundance and low maturity of organic material are favorite for the formation of high quantity of wax, which declines with decreasing organic abundance and increasing thermal maturity. This suggests that wax is derived from organic-rich lacustrine biomass at early stages of maturation (R o = 0.4%-0.7%). Although the contribution of high plant cuticular wax and sporopollen cannot be ruled out, lacustrine biomass is more important in the formation of high wax oil.

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Source rock palaeoenvironments and controls on the distribution of dibenzothiophenes in lacustrine crude oils, Bohai Bay Basin, eastern China

Cited by 170 publications

References 32 publications

Depositional system and hydrocarbon accumulation in Gubei slope zone, Zhanhua Depression, Bohai Bay Basin, eastern China

Depositional system and hydrocarbon accumulation in Gubei slope zone, Zhanhua Depression, Bohai Bay Basin, eastern China

The effects of biodegradation on the compositions of aromatic hydrocarbons and maturity indicators in biodegraded oils from Liaohe Basin

Lacustrine biomass: An significant precursor of high wax oil

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