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

Li, Yan; Qin, Shanshan; Wang, Yunpeng; Holland, Greg; Zhou, Zheng

doi:10.1016/j.gca.2020.01.039

Cited by 21 publications

(11 citation statements)

References 108 publications

(208 reference statements)

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“…Samples were first partially crushed until the sample was heard to fragment and then fully crushed when the valve tip was fully extended. Samples were purified and analyzed following the procedures of Li et al (2020). A blank and an air standard were analyzed for each sample (see Supplemental Material 1 ).…”

Section: Methodsmentioning

confidence: 99%

Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer

et al. 2021

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This study evaluates examples of hydrothermal dolomitization in the Middle Cambrian Cathedral Formation of the Western Canadian Sedimentary Basin. Kilometer-scale dolomite bodies within the Cathedral Formation carbonate platform are composed of replacement dolomite (RD), with saddle dolomite-cemented (SDC) breccias occurring along faults. These are overlain by the Stephen Formation (Burgess Shale equivalent) shale. RD is crosscut by low-amplitude stylolites cemented by SDC, indicating that dolomitization occurred at very shallow depths (<1 km) during the Middle Cambrian. Clumped isotope data from RD and SDC indicate that dolomitizing fluid temperatures were >230 °C, which demonstrates that dolomitization occurred from hydrothermal fluids. Assuming a geothermal gradient of 40 °C/km, due to rift-related basin extension, fluids likely convected along faults that extended to ∼6 km depth. The negative cerium anomalies of RD indicate that seawater was involved in the earliest phases of replacement dolomitization. 84Kr/36Ar and 132Xe/36Ar data are consistent with serpentinite-derived fluids, which became more dominant during later phases of replacement dolomitization/SDC precipitation. The elevated 87Sr/86Sr of dolomite phases, and its co-occurrence with authigenic quartz and albite, likely reflects fluid interaction with K-feldspar in the underlying Gog Group before ascending faults to regionally dolomitize the Cathedral Formation. In summary, these results demonstrate the important role of a basal clastic aquifer in regional-scale fluid circulation during hydrothermal dolomitization. Furthermore, the presence of the Stephen Formation shale above the platform facilitated the build-up of fluid pressure during the final phase of dolomitization, leading to the formation of saddle dolomite-cemented breccias at much shallower depths than previously realized.

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Section: Methodsmentioning

confidence: 99%

Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer

et al. 2021

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“… Schematic diagram of the fully automated all‐metal noble gas extraction line at Lancaster University (modified from Li et al. [2020]). …”

Section: Methodsmentioning

confidence: 99%

Performance of the NGX High‐Resolution Multiple Collector Noble Gas Mass Spectrometer

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et al. 2021

Geochem Geophys Geosyst

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Noble gases, namely helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe), have proven to be powerful tools for understanding geological systems due to their properties of low abundance and chemical inertness (Ozima & Podosek, 2002;Porcelli et al., 2002). For example, noble gases, such as 3 He and 4 He, can provide new insights into the rates and sources of groundwater recharge, residence times, and flow dynamics in groundwater studies (

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

Cited by 21 publications

References 108 publications

Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer

Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer

Performance of the NGX High‐Resolution Multiple Collector Noble Gas Mass Spectrometer

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

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