Significance of petroleum seepages in hydrocarbon exploration-case study of Khourian Desert, Central Iran.
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| Title: | Significance of petroleum seepages in hydrocarbon exploration-case study of Khourian Desert, Central Iran. |
|---|---|
| Authors: | Hosseini, Azadeh1 (AUTHOR), Saberi, Mohammad Hossein1 (AUTHOR) mh.saberi@semnan.ac.ir, ZareNezhad, Bahman2 (AUTHOR) |
| Source: | Journal of Petroleum Exploration & Production Technology. Jun2022, Vol. 12 Issue 6, p1649-1663. 15p. |
| Subject Terms: | *Oil seepage, *Sulfur isotopes, *Geophysical surveys, *Hydrocarbons, *Bacterial colonies, *Geological surveys, *Geochemical surveys |
| Geographic Terms: | Iran |
| Abstract: | Hydrocarbon exploration has long been based on such costly and time-intensive methods as geophysical surveys, geological studies, and drilling. In recent years, however, researchers have started to consider such inexpensive alternatives as surface geochemistry for hydrocarbon exploration. Some 100 years ago, the leakage of hydrocarbons onto the surface in the form of micro- and macro-seepages motivated researchers toward drilling a well in the Khourian Desert in the south of Semnan Province, Iran. Upon drilling the well, researchers found evidences of non-released (free) hydrocarbons. These findings drove further study of the area using surface geochemistry while considering the nearby hydrocarbon accumulation in Qom Formation. Conventional and indirect surface geochemical methods provide an insight into the relationship between surface and subsurface hydrocarbons. In the present work, the results of the Rock–Eval pyrolysis showed total organic carbon (TOC) values in the range of 0.31–4.13 wt.% and S1 peaks between 0.07 and 27.35. Sulfur isotope analysis showed a sulfur isotopic value of −0.4. The study of hydrocarbon-oxidizing bacteria showed the presence of bacterial colonies in MSM at 1.22 × 106 cfu/g of soil sample. We further investigated surface changes due to the presence of free hydrocarbons and pH variations (4.9–8) resulted from the changes in the concentrations of calcium carbonate and iron. According to the results and given the presence of organic sulfur in the samples, the occurrence of Gach-i-turush and alike phenomena was proposed in this area. The results of geo-microbial prospecting method, surface secondary changes, and sulfur isotope studies were well in agreement with the characteristics of the existing hydrocarbon reserves in this area. Surface geochemical surveys can precede other geochemical and geophysical surveys to identify surface anomalies and hence focus on more probable locales of hydrocarbon accumulation in the Khourian Desert, central Iran. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 156747621 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Significance of petroleum seepages in hydrocarbon exploration-case study of Khourian Desert, Central Iran. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hosseini%2C+Azadeh%22">Hosseini, Azadeh</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Saberi%2C+Mohammad+Hossein%22">Saberi, Mohammad Hossein</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mh.saberi@semnan.ac.ir</i><br /><searchLink fieldCode="AR" term="%22ZareNezhad%2C+Bahman%22">ZareNezhad, Bahman</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Petroleum+Exploration+%26+Production+Technology%22">Journal of Petroleum Exploration & Production Technology</searchLink>. Jun2022, Vol. 12 Issue 6, p1649-1663. 15p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Oil+seepage%22">Oil seepage</searchLink><br />*<searchLink fieldCode="DE" term="%22Sulfur+isotopes%22">Sulfur isotopes</searchLink><br />*<searchLink fieldCode="DE" term="%22Geophysical+surveys%22">Geophysical surveys</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrocarbons%22">Hydrocarbons</searchLink><br />*<searchLink fieldCode="DE" term="%22Bacterial+colonies%22">Bacterial colonies</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+surveys%22">Geological surveys</searchLink><br />*<searchLink fieldCode="DE" term="%22Geochemical+surveys%22">Geochemical surveys</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Iran%22">Iran</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Hydrocarbon exploration has long been based on such costly and time-intensive methods as geophysical surveys, geological studies, and drilling. In recent years, however, researchers have started to consider such inexpensive alternatives as surface geochemistry for hydrocarbon exploration. Some 100 years ago, the leakage of hydrocarbons onto the surface in the form of micro- and macro-seepages motivated researchers toward drilling a well in the Khourian Desert in the south of Semnan Province, Iran. Upon drilling the well, researchers found evidences of non-released (free) hydrocarbons. These findings drove further study of the area using surface geochemistry while considering the nearby hydrocarbon accumulation in Qom Formation. Conventional and indirect surface geochemical methods provide an insight into the relationship between surface and subsurface hydrocarbons. In the present work, the results of the Rock–Eval pyrolysis showed total organic carbon (TOC) values in the range of 0.31–4.13 wt.% and S1 peaks between 0.07 and 27.35. Sulfur isotope analysis showed a sulfur isotopic value of −0.4. The study of hydrocarbon-oxidizing bacteria showed the presence of bacterial colonies in MSM at 1.22 × 106 cfu/g of soil sample. We further investigated surface changes due to the presence of free hydrocarbons and pH variations (4.9–8) resulted from the changes in the concentrations of calcium carbonate and iron. According to the results and given the presence of organic sulfur in the samples, the occurrence of Gach-i-turush and alike phenomena was proposed in this area. The results of geo-microbial prospecting method, surface secondary changes, and sulfur isotope studies were well in agreement with the characteristics of the existing hydrocarbon reserves in this area. Surface geochemical surveys can precede other geochemical and geophysical surveys to identify surface anomalies and hence focus on more probable locales of hydrocarbon accumulation in the Khourian Desert, central Iran. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s13202-021-01440-7 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 1649 Subjects: – SubjectFull: Oil seepage Type: general – SubjectFull: Sulfur isotopes Type: general – SubjectFull: Geophysical surveys Type: general – SubjectFull: Hydrocarbons Type: general – SubjectFull: Bacterial colonies Type: general – SubjectFull: Geological surveys Type: general – SubjectFull: Geochemical surveys Type: general – SubjectFull: Iran Type: general Titles: – TitleFull: Significance of petroleum seepages in hydrocarbon exploration-case study of Khourian Desert, Central Iran. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hosseini, Azadeh – PersonEntity: Name: NameFull: Saberi, Mohammad Hossein – PersonEntity: Name: NameFull: ZareNezhad, Bahman IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 21900558 Numbering: – Type: volume Value: 12 – Type: issue Value: 6 Titles: – TitleFull: Journal of Petroleum Exploration & Production Technology Type: main |
| ResultId | 1 |
