Geochemical characteristics of water-dissolved gases and implications on gas origin of Sinian to Cambrian reservoirs of Anyue gas field in Sichuan Basin, China

Qin, Shanshan; Liu, Feng; Zhou, Zheng; Zhou, Guobing

doi:10.1016/j.marpetgeo.2017.05.013

Cited by 17 publications

(17 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Leshan-Longnvsi paleouplift was shifted to the current location of the Weiyuan gas field as a new structural high after uplifting by about 4000 m. The eastern part of the paleo-uplift was much less deformed, for example, Gaoshiti and Moxi structures were relatively stable with uplifting an amplitude of about 2500 m (Qin et al, 2018).…”

Section: Geological Background Of Sichuan Basinmentioning

confidence: 96%

“…Triassic Leikoupo formation and Upper Triassic Xujiahe formation (Tang et al, 2008;Ding et al, 2018;Qin et al, 2018;Zhao et al, 2018).…”

Section: Lower Cambrian Longwangmiao Formation Lower Triassic Jialinmentioning

confidence: 99%

“…The Longwangmiao formation is dominated by crystalline dolomite, grain dolomite, forming a regional high quality dolomite reservoir (Chen et al, 2017). The Longwangmiao formation gas reservoir has a high temperature of up to 150 °C and ultrahigh pressure with a pressure coefficient of 1.5 -1.7 (Qin et al, 2018). The predominant source rocks in this field are black mudstone and shale of Lower Cambrian Qiongzhusi formation (kerogen type I), with an average TOC value of 1.95% (Wei et al, 2015;Qin et al, 2018).…”

Section: The Middle Triassic Leikoupo Formation Conformably Overlies mentioning

confidence: 99%

“…Middle Cambrian Gaotai formation is mainly composed of siltstone. Gypseous dolomite and mudstone served as the direct caprocks in the Longwangmiao formation of the Anyue gas field (Qin et al, 2018).…”

Section: The Middle Triassic Leikoupo Formation Conformably Overlies mentioning

confidence: 99%

“…The formation water samples from gas fields were taken by using 500 ml glass bottles at gaswater separators of the well sites. After sampling, each bottle was sealed with a rubber plug to ensure that the organic components of formation water would not leak during transportation (Qin et al, 2018). Five reservoir bitumen samples were taken from the drilling cores of Gaoshiti-Moxi structures.…”

Section: Analysis Of Natural Gas Composition and Stable Carbon Isotopmentioning

confidence: 99%

See 4 more Smart Citations

Tracing interaction between hydrocarbon and groundwater systems with isotope signatures preserved in the Anyue gas field, central Sichuan Basin, China

Qin

Wang

et al. 2020

Geochimica et Cosmochimica Acta

Self Cite

View full text Add to dashboard Cite

Anyue gas field is a large gas field located in the central Sichuan Basin, China. Although many studies have been carried out previously, the formation mechanism of this field is unclear and currently under debate. To better understand the accumulation history, the role that groundwater plays in transporting hydrocarbons within sedimentary basins and water-gas interactions, stable and noble gas isotopes were measured in thirteen free gas samples from the Anyue gas field. In addition, nine formation water samples and five reservoir bitumen samples were analyzed for stable carbon isotopes. δ 13 C(CH4) values in the gas samples range from-35.0 to-32.6‰, showing evidence of thermogenic origin. δ 13 C values among three different types of samples (free gases, water-dissolved gases and reservoir bitumen) show a pattern that cannot be explained by oil cracking followed by free gas accumulation. It suggests the occurrence of gas-groundwater interaction in the Anyue field. Free gas samples can be divided into 2 distinct groups by their geographical locations and stratigraphical source formations. 3 He/ 4 He ratios (R/Ra) in group 1 and group 2 samples range from 0.0118 to 0.0132 and 0.0115 to 0.0256, respectively, indicating He is mainly derived from the crust. 20 Ne/ 22 Ne and 21 Ne/ 22 Ne ratios suggest a mixing between the air and crust sources. 40 Ar/ 36 Ar ratios ranging from 1658 to 2019 and 2168 to 5973 in group 1 and group 2 samples, respectively, are significantly higher than the air value of 298.6. In comparison, heavier noble gas (Kr and Xe) isotopic compositions are predominantly air-like. The relative enrichment of 4 He and 21 Ne* in group 1 samples can be possibly explained by preferential release of light noble gases in a low temperature environment. Samples in group 2 show a good fit to the solubility-controlled Rayleigh fractionation model, suggesting the presence of an open system degassing of gases from the groundwater. The excess heavy noble gases in natural gas samples can be attributed to the addition of sedimentary components from the source rocks during geological evolution. 4 He groundwater ages considering in-situ production and external flux indicate the addition of 3 young groundwater into the Anyue gas field. Low gas-groundwater ratios and high CH4/ 36 Ar ratios suggest that only a small portion of the gases in the current Longwangmiao reservoir of Anyue gas field has been in contact with the relatively young groundwater. Based on the noble gas and stable carbon isotope results in all samples, we propose a two-stage gas and groundwater interaction process during the gas preservation and accumulation history in the Anyue gas field in China.

show abstract

Section: Geological Background Of Sichuan Basinmentioning

confidence: 96%

“…Triassic Leikoupo formation and Upper Triassic Xujiahe formation (Tang et al, 2008;Ding et al, 2018;Qin et al, 2018;Zhao et al, 2018).…”

Section: Lower Cambrian Longwangmiao Formation Lower Triassic Jialinmentioning

confidence: 99%

Section: The Middle Triassic Leikoupo Formation Conformably Overlies mentioning

confidence: 99%

Section: The Middle Triassic Leikoupo Formation Conformably Overlies mentioning

confidence: 99%

Section: Analysis Of Natural Gas Composition and Stable Carbon Isotopmentioning

confidence: 99%

See 3 more Smart Citations

Tracing interaction between hydrocarbon and groundwater systems with isotope signatures preserved in the Anyue gas field, central Sichuan Basin, China

Qin

Wang

et al. 2020

Geochimica et Cosmochimica Acta

Self Cite

View full text Add to dashboard Cite

show abstract

Deep-basin gas generation via organic–inorganic interactions: New insights from redox-controlled hydrothermal experiments at elevated temperature

Yang

Zhong

et al. 2022

International Journal of Coal Geology

View full text Add to dashboard Cite

Cryogenian–Cambrian tectono-sedimentary evolution, paleoclimate and environment effects, and formation of petroleum resources in the Tarim Block

Zhang,

Zhu,

Chen

et al. 2024

Earth-Science Reviews

View full text Add to dashboard Cite

Geochemical characteristics of water-dissolved gases and implications on gas origin of Sinian to Cambrian reservoirs of Anyue gas field in Sichuan Basin, China

Abstract: characteristics of waterdissolved gases and implications on gas origin of Sinian to Cambrian reservoirs of Anyue gas field in

Cited by 17 publications

References 13 publications

Tracing interaction between hydrocarbon and groundwater systems with isotope signatures preserved in the Anyue gas field, central Sichuan Basin, China

Tracing interaction between hydrocarbon and groundwater systems with isotope signatures preserved in the Anyue gas field, central Sichuan Basin, China

Deep-basin gas generation via organic–inorganic interactions: New insights from redox-controlled hydrothermal experiments at elevated temperature

Cryogenian–Cambrian tectono-sedimentary evolution, paleoclimate and environment effects, and formation of petroleum resources in the Tarim Block

Contact Info

Product

Resources

About