TSR-altered oil with high-abundance thiaadamantanes of a deep-buried Cambrian gas condensate reservoir in Tarim Basin

Zhu, Guangyou; Wang, Huitong; Weng, Na

doi:10.1016/j.marpetgeo.2015.10.007

Cited by 42 publications

(14 citation statements)

References 48 publications

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“…5b -although substitution positions and actual isomeric identities could not be confirmed. These eight products probably include the six isomerically undefined C 3 alkyl-2-thiaadamantanes previously reported from GCxGC-MS analysis of other petroleums (Jiang et al, 2008;Wei et al, 2012;Zhu et al, 2016a). The mass spectra (a-f) of these established products compare closest to peaks 9 TA -13 TA and 15 TA of the LS2 condensate (Fig.…”

Section: Thiadiamondoidsmentioning

confidence: 58%

“…The isomeric identity of the other three C 2 -2-TA's (peaks 6 TA -8 TA ; Fig. 5) could not be assigned, although 7 TA and 8 TA are likely the same as two C 2 -2-TA's observed by GC-GC-MS analysis of deep Cambrian oils from Tarim Basin (Zhu, et al, 2016a).…”

Section: Thiadiamondoidsmentioning

confidence: 91%

“…The high 3.6% H 2 S content of the condensate is indicative of TSR (Zhu et al, 2015a;2016a). The thiadiamondoids and thiophenes (e.g., BTs, DBTs, PTs) in the LS2 condensate are common products of TSR, which was also likely responsible for the ~4‰ heavier  34 S values of BTs compared to DBTs.…”

Section: Origin Of H 2 S and Organic Sulfur Compoundsmentioning

confidence: 99%

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High abundance of alkylated diamondoids, thiadiamondoids and thioaromatics in recently discovered sulfur-rich LS2 condensate in the Tarim Basin

Zhu

Zhang

et al. 2018

Organic Geochemistry

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Section: Thiadiamondoidsmentioning

confidence: 58%

Section: Thiadiamondoidsmentioning

confidence: 91%

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High abundance of alkylated diamondoids, thiadiamondoids and thioaromatics in recently discovered sulfur-rich LS2 condensate in the Tarim Basin

Zhu

Zhang

et al. 2018

Organic Geochemistry

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“…The products are mainly thiophenic compounds with high molecular condensation degrees, such as BTs and DBTs. Thiadiamondoids and diamondoidthiols, as well as thiols, are often found in these oils. ,− …”

Section: Geological Formation Of Sulfur Compoundsmentioning

confidence: 99%

Review on Sulfur Compounds in Petroleum and Its Products: State-of-the-Art and Perspectives

Shi

2021

Energy Fuels

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Sulfur compounds have significant geochemical information, and the removal of sulfur from petroleum products is one of the most important tasks in petroleum refining. However, it is a challenging task to reveal the chemical composition of sulfide at the molecular level because of its complex composition. Unremitting efforts have been made to develop methods for the separation and characterization of sulfur compounds in petroleum and its products in order to understand the mechanisms of their geological origin and their transformation in petroleum processing. Sulfur compounds include thiophenes, sulfides, thiols, sulfoxides, and sulfones, etc. The sulfur element is mainly from sulfate in the sedimentary environment, but the combination of sulfur into hydrocarbons could occur in different ways. Most sulfur compounds are generated in the early diagenetic period through the reaction of unsaturated organic matter with H2S or elemental sulfur released from sulfate via bacterial sulfate reduction. The composition of the sulfur compound in petroleum could be largely altered by thermal maturation, leading to an increase in the relative abundance of highly condensed aromatic sulfur compounds. Another important pathway of sulfur addition is thermochemical reactions between sulfate and hydrocarbons at high temperatures. Some sulfur compounds have a relatively weak chemical stability and are easily decomposed into small-molecule sulfur compounds in petroleum processing. Removing sulfur from petroleum is an essential task for petroleum refinement and upgrading, in which the steric hindrance effect is the most important factor affecting the desulfurization activity of sulfur compounds via hydrotreating. Some polar sulfur compounds are difficult to hydrogenate to remove sulfur; however, the chemical structures of these compounds are unclear. High-resolution mass spectrometry has revealed the high complexity of the molecular composition of sulfur compounds in heavy oils and their polar fractions. However, understanding of their molecular structure is limited, and further research should focus on the formation and transformation mechanism of these polar sulfur compounds. This review will focus on the molecular composition of petroleum sulfur compounds with a collection of topics of sulfur compounds that covers the upstream and downstream petroleum industry, including separation and characterization methods, molecular and structural composition of various sulfur compounds, mechanisms of their geological origin, and their transformation during petroleum processing.

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“…During Chinese 13th Five-Year Plan period, PetroChina and Sinopec increased investment in exploration and achieved major exploration discoveries in the ultra-deep stratas of Tarim Basin. So far, several billion-ton-level oilfields in Tarim Basin have been discovered and developed one after another, such as Tahe, Tazhong, Halahatang, YingMaiLi, and Shunbei Oilfields [1][2][3][4][5]. Taking Shunbei Oilfield as example, this type of newly discovered reservoirs behave some unique features that are different from conventional carbonate reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Parameters evaluation of fault-karst carbonate reservoirs with vertical beads-on-string structure based on bottom-hole pressure: Case studies in Shunbei Oilfield, Tarim Basin of Northwestern China

Cao

Cheng

Chen³

et al. 2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Tarim Basin newly discovered the fault-karst carbonate reservoirs, which are formed by the large-scale tectonic fault activities and multiple-stage karstification. Four kinds of mediums coexist in the reservoirs, including the large cave, vug, tectonic fracture and matrix. The tectonic fractures interconnect with large caves in series to form the vertical beads-on-string structure, which is the most common connection pattern in reservoirs. To provide a well test method for evaluating this type of structure, this work firstly presents a multi-fracture-region multi-cave-region series connection physical model by simplifying vertical beads-on-string structure. We consider four kinds of mediums in the proposed physical model, including large caves, small vugs, high-angle tectonic fracture and rock matrix. The fracture regions mainly contain fracture, vug and matrix mediums. The cave regions contain cave medium. The corresponding mathematical model is also developed, in which the flow in fracture regions obeys the Darcy’s law, while the flow in cave regions is assumed to obey free flow. Furthermore, the gravity is taken into account because the flow is along the vertical direction. Then the typical flow regimes are analyzed and sensitivity analysis is conducted on crucial parameters. Results indicate that (a) the typical feature of vertical beads-on-string structure on type curves is that the cave storage regimes and linear flow regimes alternately appear; (b) the type curves will exhibit the cave storage regimes with unit-slope pressure derivative for the existence of large caves, which is different from the inter-porosity flow regimes for the existence of the vugs (slope ≠ 1); (c) the gravity effect could lead to unit-slope pressure and pressure derivative curves, which can be regarded as closed boundary in a peculiar sense; (d) gravity effect is difficult to be observed from well test curves with about 2-weeks test duration in real application. Finally, two cases from Shunbei Oilfield are interpreted to illustrate the practicability and feasibility of proposed method.

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TSR-altered oil with high-abundance thiaadamantanes of a deep-buried Cambrian gas condensate reservoir in Tarim Basin

Cited by 42 publications

References 48 publications

High abundance of alkylated diamondoids, thiadiamondoids and thioaromatics in recently discovered sulfur-rich LS2 condensate in the Tarim Basin

High abundance of alkylated diamondoids, thiadiamondoids and thioaromatics in recently discovered sulfur-rich LS2 condensate in the Tarim Basin

Review on Sulfur Compounds in Petroleum and Its Products: State-of-the-Art and Perspectives

Parameters evaluation of fault-karst carbonate reservoirs with vertical beads-on-string structure based on bottom-hole pressure: Case studies in Shunbei Oilfield, Tarim Basin of Northwestern China

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