Methane-dominated gaseous inclusions in the Sinian carbonate reservoirs in central Sichuan Basin and their implications for natural gas accumulation

Wang, Xing; Tian, Hui; Xiao, Xianming; Liu, Dehan; Min, Yi; Li, Tengfei; Ji, Sun; Peng, Ping’an

doi:10.1016/j.marpetgeo.2020.104871

Cited by 17 publications

(8 citation statements)

References 36 publications

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“…4d ), corresponding to the period of ELIP activity (Fig. 4a–c ), high-temperature hydrothermal fluids (~319 °C) 30 invaded the basin through faults, unconformities, and high-porosity reservoirs, and then efficiently pyrolyzed the oils into methane and pyrobitumen within the reservoirs 31 , 32 , 52 . This process has been recorded in in-situ pyrobitumen, hydrothermal veins, quartz inclusions and other hydrothermal-related minerals 18 , 21 , 30 , 33 .…”

Section: Resultsmentioning

confidence: 99%

“…For example, the Sinian Dengying Formation contains widely developed hydrothermal channels that formed on the basis of tiny-grabens caused by the pull-apart function of strike-slip faults 53 , which likely provided potential faults and pipes contemporaneous with the ELIP for gas venting 25 . Such rapid expansion and extreme high pressures have been preserved in CH 4 -dominated gaseous inclusions within the quartz formed in the reservoirs 52 . Paleo-pressure coefficients of larger than 3.0 were recorded under Late Permian trapping depths compared to the values of the gas pool pressure coefficients of less than 1.2 under current reservoir conditions 21 , 30 .…”

Section: Resultsmentioning

confidence: 99%

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High temperature methane emissions from Large Igneous Provinces as contributors to late Permian mass extinctions

et al. 2022

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Methane (CH4) emissions induced by Large Igneous Provinces have the potential to contribute to global environmental changes that triggered mass extinctions in Earth’s history. Here, we explore the source of methane in gas samples from central Sichuan Basin, which is within the Emeishan Large Igneous Province (ELIP). We report evidence of high methane formation temperatures (between 249−17/+19 and 256−20/+22 °C) from clumped methane measurements and mantle-derived signatures of noble gases, which verify that oil-cracked CH4 and pyrobitumen are by-products within the reservoirs, associated with hydrothermal activity and enhanced heating by the ELIP. We estimate the volume of oil-cracked CH4 induced by the ELIP and argue that CH4 emissions would have been sufficient to initiate global warming prior to the end of the Permian. We also suggest that similar emissions from oil-cracked CH4 associated with the Siberian Traps Large Igneous Province may also have contributed to the end-Permian mass extinction significantly.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High temperature methane emissions from Large Igneous Provinces as contributors to late Permian mass extinctions

et al. 2022

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“… 1 Besides the distinguishing plate, the existence of a large amount of reservoir bitumen under the reflected polarized light microscope ( Figure 6 ) also suggests the occurrence of oil cracking. 33 − 35 It has been reported that the bitumen contents in the reservoirs of the Deng-2 Member, Canglangpu Formation, and Longwangmiao Formation can reach 4.7%, 1.9%, and 2.1%, respectively, 1 proving the development of paleo-oil reservoir with favorable gas generation capacity in the Penglai gas area.…”

Section: Discussionmentioning

confidence: 99%

“… 32 According to Figure 5 , for the Sinian-Cambrian natural gas samples in the Penglai gas area, all the samples belong to oil-cracking gas with R o > 2.5%, same as the Anyue gas field. 33 It is pointed out that the source rocks of the Sinian-Cambrian source rocks entered the overmature evolution stage in the Middle Jurassic, and then reached the maturity peak in the Cretaceous, during which period the crude oil massively cracked and generated substantial amounts of natural gas. 1 Besides the distinguishing plate, the existence of a large amount of reservoir bitumen under the reflected polarized light microscope ( Figure 6 ) also suggests the occurrence of oil cracking.…”

Section: Discussionmentioning

confidence: 99%

Geochemical Characteristics and Origin of Sinian-Cambrian Natural Gas in Penglai Gas Area, Sichuan Basin

Zhang,

Li,

Xie

et al. 2024

ACS Omega

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The Sichuan Basin in southern China is well-known for its large natural gas resource potential stored in Sinian-Cambrian systems. Recently, high-yield industrial gas flow has been discovered from the Dengying Formation (Sinian System) and Canglangpu Formation (Cambrian System) in the Penglai gas area, preluding the multilayer stereoscopic exploration in Sichuan Basin. However, the origin of the natural gas and its preserving mechanics is still debated, and thus, in this study the geochemical characteristics of the natural gas are systematically analyzed, based on the data from gas composition and hydrocarbon isotope of a series of local wells. On this basis, the geochemical characteristics of natural gas in different regions and layers are compared, and the reasons for these differences from the origin and influencing factors are analyzed. The results show the following: (1) The natural gas of the Penglai gas field is dry gas dominated by CH4, and the Sinian Dengying Formation gas has lower C2H6 content, larger dryness coefficient, heavier δ13C, and lighter δ2HCH4 than the Cambrian gas, which is associated with the high proportion of hydrocarbons from the high-maturity Dengying source rocks. (2) The natural gas from some wells in the lower part of the structure is characterized by high H2S content and low CH4 content, and heavy δ13C in the components, which seems to be affected by the thermochemical sulfate reduction (TSR) effect. (3) The natural gas from the Penglai gas area has a relatively low maturity, which appears to be attributed to the continuous sealing ability of the caprock, which can preserve both the early generated gas and the late thermal-cracked gas.

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“…Gaoshiti, Moxi, and Gaoshitinan. In a macroscopic view, the Gaoshiti-Moxi area presents a sequence of paleogeographic distribution from east to west of the karst platform, karst slope, and karst lowland, and various secondary microgeographic units are developed inside the karst platform [35][36][37]. On the other hand, the distribution differences of the microgeographic units in the Gaoshiti and Moxi areas are also obvious.…”

Section: The Sinian Gas Reservoir In the Anyue Gas Field Represents Sedimentation Of The Platform Mound-beachmentioning

confidence: 99%

Comparative Study on the Reservoir Characteristics and Development Technologies of Two Typical Karst Weathering-Crust Carbonate Gas Reservoirs in China

et al. 2021

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Carbonate reservoirs are the main reservoir types in China, which occupy the large ratio of reserves and production at present. The high-efficiency development of carbonate reservoirs is of great significance to assure the stability of national energy supply. The Lower Paleozoic reservoir in Jingbian gas field and the Sinian reservoir in Anyue gas field are two typical carbonate gas reservoirs, and their successful development experiences can provide significant references for other similar carbonate gas reservoirs. For Jingbian gas field, it is a lithological-stratigraphic reservoir developed in a westward monocline and multiple rows of nose-fold structures, and is a stable craton basin with simple palaeognomy distribution and stable connectivity, which has complex gas-water distribution. However, for Anyue gas field, it is a lithological-structural reservoir with multiple tectonic high points and multiple fault systems, and is biological dune beach facies under extensional setting with highly differentiated inside of the block in palaeognomy characteristics, which has limited connectivity and tectonic side water is in a local area. The difference of gas reservoir characteristics leads to the diverse development strategies. For these two gas reservoirs, although there are some similar aspects, such as the screen of enrichment areas, the application of irregular well pattern and reservoir stimulation techniques, the criteria of enrichment areas, the well types, and the means of reservoir stimulation are absolutely different. In addition, due to the differences of control reserves and production capacity for these two kinds of reservoirs, the mode of stable production is also different. The effective development of Jingbian gas field can give some references to the future exploitation on the Sinian gas reservoir. Firstly, the sedimentary characteristics should be studied comprehensively. Secondly, the distribution pattern and distribution characteristics of the palaeognomy should be found and determined. Thirdly, the distribution of fracture system in the reservoir should be depicted finely. Finally, dynamic monitoring on the production performance should be strengthened, and the management for this gas field should be improved further. The findings of this study can help for better understanding of the Karst weathering-crust carbonate gas reservoir formation characteristics and the optimal development technologies that should be taken in practice.

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Methane-dominated gaseous inclusions in the Sinian carbonate reservoirs in central Sichuan Basin and their implications for natural gas accumulation

Cited by 17 publications

References 36 publications

High temperature methane emissions from Large Igneous Provinces as contributors to late Permian mass extinctions

High temperature methane emissions from Large Igneous Provinces as contributors to late Permian mass extinctions

Geochemical Characteristics and Origin of Sinian-Cambrian Natural Gas in Penglai Gas Area, Sichuan Basin

Comparative Study on the Reservoir Characteristics and Development Technologies of Two Typical Karst Weathering-Crust Carbonate Gas Reservoirs in China

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