| 团簇同位素在白云岩化流体恢复中的应用与局限性 |
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| 引用本文： | 李平平,王淳,邹华耀,余新亚. 团簇同位素在白云岩化流体恢复中的应用与局限性[J]. 石油与天然气地质, 2021, 42(3): 738-746. DOI: 10.11743/ogg20210318 |
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| 作者姓名： | 李平平 王淳 邹华耀 余新亚 |
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| 作者单位： | 1. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 1022492. 中国石油大学(北京) 地球科学学院, 北京 1022493. 中国地质大学(武汉) 资源学院, 武汉 湖北 430074 |
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| 摘 要： | 碳酸盐的团簇同位素(Δ47)可以直接确定矿物的形成温度,结合矿物的氧同位素,还可以根据传统的氧同位素温度计确定矿物生长的流体(水)的氧同位素(δ18 O),提供了一种潜在的确定白云化流体的δ18 O、分析白云岩化流体来源的新方法.受白云岩化之后的重结晶作用和高温固态重置作用的影响,白云岩的团簇同位素温度(TΔ47)会比...
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| 关 键 词： | 团簇同位素 氧同位素 重结晶作用 白云岩 白云岩化流体 碳酸盐岩 四川盆地 |
| 收稿时间： | 2021-01-25 |
Application of clumped isotopes to restoration of dolomitizing fluids and its limitations |
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| 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. DOI: 10.11743/ogg20210318 |
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| Authors: | Pingping Li Chun Wang Huayao Zou Xinya Yu |
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| Affiliation: | 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China3. Faculty of Earth Resource, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China |
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| 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 (TΔ47) usually reads higher than the actual dolomitization temperature, thus limiting the application of TΔ47 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 TΔ47 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. |
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| Keywords: | clumped isotope oxygen isotope recrystallization dolostone dolomitizing fluid carbonate Sichuan Basin |
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