LA-ICP-MS U-Pb geochronology and clumped isotope constraints on the formation and evolution of an ancient dolomite reservoir: The Middle Permian of northwest Sichuan Basin (SW China)

Pan, Liyin; Shen, Anjiang; Zhao, Jian‐xin; Hu, Anping; Hao, Yi; Liang, Feng; Feng, Yuexing; Wang, Xiaofang; Jiang, Lei

doi:10.1016/j.sedgeo.2020.105728

Cited by 37 publications

(11 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…SEM characteristics of euhedral dolomite and typical dissolved and undissolved dolomites. (a) Euhedral dolomite, 2414.07 m, Well K2; (b) Euhedral dolomite, 2424.92 m, Well K2; (c) Undissolved dolomite, intact crystal texture (Pan et al, 2020); (d) Dissolved dolomite (She et al, 2014). …”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The origin of heterogeneous sucrosic dolomite reservoir of the lower Permian Qixia Formation, NW Sichuan Basin, China

Jiang

Wang

Dong³

et al. 2023

Energy Exploration & Exploitation

Self Cite

View full text Add to dashboard Cite

Sucrosic dolomite, an important hydrocarbon reservoir, has long been the focus of carbonate sedimentological and reservoir geological studies. This study investigated a kind of heterogeneous sucrosic dolomite in the Lower Permian Qixia Formation of NW Sichuan Basin, which has recently been the location of giant natural gas discoveries. The heterogeneous sucrosic dolomite is characterized by coexistence of porous euhedral dolomite and tight anhedral dolomite, and it is mainly distributed in the platform-marginal shoal facies with a quasi-layered structure. Further geochemical analysis, including C, O, and Sr isotopes as well as rare earth elements, reveals that the euhedral dolomite and anhedral dolomite have similar geochemical properties to the matrix limestone representing coeval seawater, and they were mainly generated from dolomitization by the closed marine-related fluid (left-leaning REE and δPr < 1) in the shallow burial. The difference in crystal morphology, porosity, and permeability between the euhedral dolomite and anhedral dolomite is mainly related to the compositional and textural heterogeneities of the host rocks. Due to the dissolution of meteoric water (relatively flat REE and low Y/Ho) in the early diagenetic stage caused by high frequent exposures, quasi-layered vugs and caves were formed in the grainstones. In the process of shallow burial dolomitization, the loose-filled carbonate sands formed the porous euhedral dolomite due to sufficient space, while the matrix limestone formed the tight anhedral dolomite due to relatively poor porosity and permeability. Accordingly, the paleogeomorphic highland controlled platform-marginal shoal superimposed by meteoric water dissolution in the early diagenetic stage is the main factor for the formation of Qixia Formation reservoirs, while dolomitization is mainly manifested as the inheritance and adjustment of pre-existing pores in the host rock. Therefore, the exploration direction for dolomite reservoirs in the Qixia Formation in the Sichuan Basin should be shifted to the favorable sedimentary facies-controlled reservoir model, which can also be referential for other cases under similar geological setting.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Location of the study area and sedimentary facies distribution (modified from Pan et al, 2022) of Qixia Formation.…”

Section: Geological Settingmentioning

confidence: 99%

The origin of heterogeneous sucrosic dolomite reservoir of the lower Permian Qixia Formation, NW Sichuan Basin, China

Jiang

Wang

Dong³

et al. 2023

Energy Exploration & Exploitation

Self Cite

View full text Add to dashboard Cite

show abstract

“…Knowledge of the composition and temperature of the parent fluid(s) allows for quantitative statements regarding burial diagenesis and isotope fractionation. Moreover, carbonate clumped isotope analysis was established as highly promising (but non‐trivial) approach in carbonate diagenesis research (Bernasconi et al, 2021; Millán et al, 2016; Murray & Swart, 2017; Pan et al, 2020; Ritter et al, 2015; Staudigel & Swart, 2019). With regard to the data obtained, clumped isotope analyses are performed using a larger sample volume representing a bulk‐data point averaging across several diagenetic phases.…”

Section: Isotope Geochemistry Of Burial Fluids and Carbonate Cementsmentioning

confidence: 99%

On the delimitation of the carbonate burial realm

Immenhauser¹

2021

The Depositional Record

View full text Add to dashboard Cite

show abstract

“…Consequently, the present-day T Δ47 of the finely crystallized dolostone cannot be used to determine the MBT. Perhaps U-Pb dating of carbonate can be used to accurately determine the final equilibrium age of the dolostone (Pan et al, 2020), and combined with the general burial and thermal gradient information, it can be used to reconstruct the MBT based on the solid-state reordering model, which is a valuable research direction for future studies.…”

Section: Figure 5 |mentioning

confidence: 99%

Using Clumped Isotopes to Reconstruct the Maximum Burial Temperature: A Case Study in the Sichuan Basin

Duan

Cheng

et al. 2021

Front. Earth Sci.

View full text Add to dashboard Cite

For strata that have experienced continual burial in the early stage and uplift in the late stage, the present-day temperature is lower than the maximum burial temperature (MBT), which is a key parameter for studying the hydrocarbon generation history of source rocks in petroliferous basins. In this paper, a new method for reconstructing the MBT is proposed based on the solid-state reordering model of carbonate clumped isotopes (Δ47). The MBT reconstructed using the Δ47 was compared with the MBT constrained using the traditional Easy%Ro model. The clumped isotope temperature (TΔ47) of the Permian micritic limestone from the Xibeixiang outcrop (about 62°C) is much higher than its initial formation temperature (20–25°C), suggesting that the limestone experienced partial solid-state reordering during the late burial process. The MBT of the calcite obtained from the solid-state reordering model is 139–147°C, which is quite similar to the MBT determined using the Easy%Ro model (139.5–147.5°C). TΔ47 of the Permian and Triassic limestone and calcite cements in the Puguang gas field are 150–180°C, while TΔ47 of the micritic dolostone is about 70°C, suggesting that the Δ47 of the limestone and calcite cements experienced complete solid-state reordering and the dolostone only experienced partial solid-state reordering. The MBT of the dolomite determined using the solid-state reordering model is 200–220°C, which is also similar to the MBT determined using the Easy%Ro model (202–227°C). Therefore, the case studies from the Sichuan Basin suggest that Δ47 can be used to reconstruct the MBT of ancient carbonate strata lacking vitrinite and detrital zircon data. However, different types of carbonate samples should be used to reconstruct the MBT for strata that have experienced different temperature histories. Micritic limestone and very finely crystallized dolostone can be used to reconstruct the MBT of strata that have experienced MBTs of <150–200°C and >200–250°C, respectively.

show abstract

LA-ICP-MS U-Pb geochronology and clumped isotope constraints on the formation and evolution of an ancient dolomite reservoir: The Middle Permian of northwest Sichuan Basin (SW China)

Cited by 37 publications

References 77 publications

The origin of heterogeneous sucrosic dolomite reservoir of the lower Permian Qixia Formation, NW Sichuan Basin, China

The origin of heterogeneous sucrosic dolomite reservoir of the lower Permian Qixia Formation, NW Sichuan Basin, China

On the delimitation of the carbonate burial realm

Using Clumped Isotopes to Reconstruct the Maximum Burial Temperature: A Case Study in the Sichuan Basin

Contact Info

Product

Resources

About