Origin of a microbial-dominated carbonate reservoir in the Lower Cambrian Xiaoerbulake Formation, Bachu-Tazhong area, Tarim Basin, NW China

Jiang, Weimin; Luo, Qiaojie; Shi, Kaibo; Liu, Bo; Wang, Yuanchong; Gao, Xiangyun

doi:10.1016/j.marpetgeo.2021.105254

Cited by 10 publications

(2 citation statements)

References 72 publications

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“…The 87 Sr/ 86 Sr values of CD1 and C1 are higher than those in Middle Ordovician seawater (Figure 8). The main mechanisms that cause the 87 Sr/ 86 Sr values of diagenetic fluid higher than those of seawater include: (a) The influx of continental water from silicon‐rich aluminate strata with radioactive 87 Sr increases the 87 Sr/ 86 Sr in the primitive diagenetic fluids (Grobe, Machel, & Heuser, 2000; Palmer & Edmond, 1989; Pu, Yuan, Zhang, & Zhao, 2012); (b) the influx of deep hydrothermal fluids derived from the underlying highly metamorphosed rocks with radioactive 87 Sr increase the 87 Sr/ 86 Sr values of diagenetic fluids (Harris, 1995; Jiang et al, 2021). As discussed above, the REE concentration and the REE pattern with no positive Eu anomaly of CD1 and C1 can exclude the hydrothermal origin.…”

Section: Discussionmentioning

confidence: 99%

The moldic pore evolution of the Middle Ordovician sabkha dolostone in Ordos Basin, China: A study based on the petrographic and geochemical characteristics of pore fillings

et al. 2022

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In the Ordos Basin, the sabkha dolostone reservoir with moldic pores of the fifth Member in the Middle Ordovician Majiagou Formation (M5) dominated the gas production of the Lower Palaeozoic. Recent research studies revealed the complex history of the moldic pore evolution, which intensively affected the reservoir potential evaluation. The moldic pores were formed by dissolution of the gypsum concretion and then experienced a different extent of multi‐phase filling. In order to understand the evolution of the moldic pores and explain its affection on the development of reservoirs, comprehensive petrographic and geochemical analysis including the cathodoluminescent, scanning electron microscope, trace and rare earth elements in situ, and strontium isotopes have been utilized to study the moldic pore fillings. The results reveal the moldic pore evolution: (a) the gypsum concretions were dissolved and the moldic pores were formed in the early diagenetic stage; (b) the calcite fillings formed in the vadose zone and phreatic zone during the early diagenetic stage in the sabkha environment; (c) the ferroan dolomites formed during the process of conversion of montmorillonite to illite at the burial diagenesis stage, at the burial depth of 3,500 m–4,000 m in the middle‐Late Jurassic. Significantly, filling in the late burial period is more conducive to the pore preservation compared with the filling in the early diagenetic stage, and the formation of the sabkha dolostone reservoir lies in the preservation of pores in the early diagenetic stage. Consequently, the results of this study provide a framework to differentiate the petrographic and geochemical characteristics of kinds of pore fillings and to understand the moldic pore evolution and its affection on the development of reservoirs in similar sedimentary environments.

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Section: Discussionmentioning

confidence: 99%

The moldic pore evolution of the Middle Ordovician sabkha dolostone in Ordos Basin, China: A study based on the petrographic and geochemical characteristics of pore fillings

et al. 2022

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“…Sequence stratigraphy theory provides methods for the analyses of sea‐level changes, carbonate sedimentary systems, reservoir pore evolution, and prediction of favourable oil and gas reservoirs within an isochronous stratigraphic framework (Fallatah & Kerans, 2018; Flügel, 2004; Jiang et al, 2021; Jiao et al, 2019; Moore & Wade, 2013). Previous studies have carried out extensive work on the characteristics of sequences, depositional facies, and stratigraphic cycles in the Yijianfang Formation.…”

Section: Introductionmentioning

confidence: 99%

Depositional facies and sequence architecture of the Yijianfang Formation in the Shuntuoguole Low Uplift, Tarim Basin, NW China

Song

Shi

et al. 2022

Geological Journal

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In the Middle Ordovician, a ramp carbonate platform was developed in the Shuntuoguole Low Uplift, Tarim Basin. The depositional facies and sequence stratigraphy were investigated using petrographic observations and Fischer plot analyses to clarify the evolution and distribution of depositional facies within the sequence stratigraphic framework of the Yijianfang Formation. Nine types of microfacies (MF1–MF9) were identified in seven environments on a ramp: (a) peritidal, (b) lagoon, (c) low‐energy bioclastic shoal, (d) shoal, (e) sheltered proximal middle‐ramp, (f) low‐energy bioclastic shoal middle‐ramp, and (g) shoal middle‐ramp. A depositional model was established based on analyses of the depositional facies from the key wells. Fischer plots obtained based on fourth‐order cycles identified from continuous wavelet transform of gamma‐ray logging data were analysed. The results show that the changes in relative sea level, as indicated by Fischer plots, are highly consistent with the evolution of paleo‐water depths indicated by microfacies types, microfacies associations, and geochemical indicators. Four third‐order depositional sequences (SQ1–4) were identified according to variations in accommodation space. The accommodation space and its growth rate during the SQ2 transgressive period were the largest, it manifested as rapid landward migration of facies, and sudden changes in the gamma‐ray logging values at the maximum flooding surface. This feature can be easily compared across the entire region. The results of this study indicate that changes in relative sealevel in the Yijianfang Formation are consistent with the global sea‐level change curve, which suggests that sea‐level fluctuation is the main factoir controlling sequence architecture and the evolution of depositional facies.

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A novel evaluation method of dolomite reservoir using electrical image logs: The Cambrian dolomites in Tarim Basin, China

Wu,

Su,

Zhang

et al. 2024

Geoenergy Science and Engineering

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Origin of a microbial-dominated carbonate reservoir in the Lower Cambrian Xiaoerbulake Formation, Bachu-Tazhong area, Tarim Basin, NW China

Cited by 10 publications

References 72 publications

The moldic pore evolution of the Middle Ordovician sabkha dolostone in Ordos Basin, China: A study based on the petrographic and geochemical characteristics of pore fillings

The moldic pore evolution of the Middle Ordovician sabkha dolostone in Ordos Basin, China: A study based on the petrographic and geochemical characteristics of pore fillings

Depositional facies and sequence architecture of the Yijianfang Formation in the Shuntuoguole Low Uplift, Tarim Basin, NW China

A novel evaluation method of dolomite reservoir using electrical image logs: The Cambrian dolomites in Tarim Basin, China

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