团簇同位素在白云岩化流体恢复中的应用与局限性

doi:10.11743/ogg20210318

Abstract

Abstract:

Clumped isotopes (Δ₄₇) can be used to determine formation temperature of carbonate minerals.If combined with the conventional oxygen thermometer and δ¹⁸O of the minerals, the temperature can be used further to calculate the δ¹⁸O of fluids (water), in which the minerals are developed.This provides a potential new method for determining the δ¹⁸O and sources of dolomitizing fluids.However, affected by recrystallization and solid-state reordering after dolomitization, the clumped isotope temperature (T_Δ₄₇) usually reads higher than the actual dolomitization temperature, thus limiting the application of T_Δ₄₇ to the restoration of fluid δ¹⁸O.To determine the sources of the dolomitizing fluids from the Changxing (P₂c) and Feixianguan Formations (T₁f) in northeastern Sichuan Basin, clumped isotopes of dolostone samples from the Puguang and Yuanba gas fields were collected and measured.The T_Δ₄₇ of P₂c and T₁f dolostone samples from the two gas fields ranges between 70 ℃ and 130 ℃, which, however, should be seen as apparent temperature of the samples considering the effect of recrystallization and solid-state reordering.The thermal history and solid-state reordering model results show that the apparent temperature of the samples would increase by about 30-35 ℃ under high-temperature solid-state reordering and the δ¹⁸O of the dolomitizing fluids is 0-4‰ (SMOW) after restoring solid-state reordering, indicating a high-salinity evaporative sea water source.

Key words: clumped isotope, oxygen isotope, recrystallization, dolostone, dolomitizing fluid, carbonate, Sichuan Basin

CLC Number:

TE122.2

Pingping Li, Chun Wang, Huayao Zou, Xinya Yu. Application of clumped isotopes to restoration of dolomitizing fluids and its limitations[J]. Oil & Gas Geology, 2021, 42(3): 738-746.

Figures/Tables 7

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Application of clumped isotopes to restoration of dolomitizing fluids and its limitations

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