| 运用方解石中流体包裹体最小均一温度确定塔河油田奥陶系油气成藏时间:来自激光原位方解石U-Pb年龄的证据 |
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| 引用本文： | 徐豪,郭小文,曹自成,王斌,刘永立,陈家旭,张旭友,罗涛.运用方解石中流体包裹体最小均一温度确定塔河油田奥陶系油气成藏时间:来自激光原位方解石U-Pb年龄的证据[J].地球科学,2021,46(10):3535-3548. |
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| 作者姓名： | 徐豪 郭小文 曹自成 王斌 刘永立 陈家旭 张旭友 罗涛 |
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| 作者单位： | 1.中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金项目41872139 |
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| 摘 要： | 碳酸盐矿物中的同期烃类包裹体共生盐水包裹体均一温度变化范围较大，导致采用流体包裹体均一温度结合储层埋藏史和热演化史确定的油气成藏时间具有多解性.以塔里木盆地塔河油田奥陶系碳酸盐岩油气藏为例，基于方解石脉体中发育的流体包裹体岩相学、荧光分析和显微测温，结合激光原位方解石U-Pb定年结果，提出利用同期烃类包裹体共生盐水包裹体最小均一温度确定油气成藏时间，并确定塔河油田奥陶系碳酸盐岩储层油气充注期次和时间.塔河油田奥陶系储层共存在4期油充注，第1期至第3期油充注时间分别与3期方解石脉体形成时间一致，第4期油充注发生于3期方解石脉形成之后.对发育原生烃类包裹体的方解石脉进行激光原位U-Pb同位素绝对定年，结果指示采用同期油包裹体共生盐水包裹体最小均一温度确定的油气充注时间与方解石脉形成时间一致，说明采用同期盐水包裹体最小均一温度确定的油气充注时间更可靠.运用同期油包裹体共生盐水包裹体最小均一温度得到，塔河地区奥陶系碳酸盐岩油气藏4期油气充注时间分别对应加里东、海西、印支和燕山构造运动时期.
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| 关 键 词： | 最小均一温度 流体包裹体 激光原位方解石U-Pb定年 油气成藏年代学 塔河油田 油气 |
| 收稿时间： | 2020-11-08 |
Application of Minimum Homogenization Temperatures of Aqueous Inclusions in Calcite Veins to Determine Time of Hydrocarbon Accumulation in Ordovician of Tahe Oilfield: Evidence from In-Situ Calcite U-Pb Dating by Laser Ablation |
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| Xu Hao,Guo Xiaowen,Cao Zicheng,Wang Bin,Liu Yongli,Chen Jiaxu,Zhang Xuyou,Luo Tao.Application of Minimum Homogenization Temperatures of Aqueous Inclusions in Calcite Veins to Determine Time of Hydrocarbon Accumulation in Ordovician of Tahe Oilfield: Evidence from In-Situ Calcite U-Pb Dating by Laser Ablation[J].Earth Science-Journal of China University of Geosciences,2021,46(10):3535-3548. |
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| Authors: | Xu Hao Guo Xiaowen Cao Zicheng Wang Bin Liu Yongli Chen Jiaxu Zhang Xuyou Luo Tao |
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| Abstract: | The homogenization temperatures of aqueous inclusions coeval with the hydrocarbon inclusions are widely distributed in carbonate minerals, which leads to that the timing of oil charge interpreted by fluid inclusion homogenization temperatures combined with burial and thermal histories of reservoir is ambiguity. Taking the carbonate of Ordovician in Tahe oilfield of the Tarim basin as an example, the timing of oil charge determined by the minimum homogenization temperature of aqueous inclusions coeval with the hydrocarbon inclusions combined with burial and thermal histories is suggested and the timing of oil charge in the Ordovician strata of Tahe oilfield was investigated in this study based on the investigation of the lithography, microspectrofluorimetry and microthermistry of fluid inclusions developed in calcite veins combined with the result of in-situ U-Pb dating by laser ablation. There are four episodes of oil charge in Tahe oilfield. The timing of the first to third episodes of oil charge is consistent with the formation time of three calcite veins and the fourth episode of oil charge occurred after the three calcite veins. The results of the U-Pb dating by laser ablation of the calcite veins associated with primary oil inclusions indicate that the absolute age of calcite veins is consistent with the timing of oil charge determined by the minimum homogenization temperature of aqueous inclusions coeval with the oil inclusions combined with burial and thermal histories, which confirmed that the timing of oil charge determined by the minimum homogenization temperature of aqueous inclusions coeval with the hydrocarbon inclusions combined with burial and thermal histories is more credible. Finally, it is suggested that the timing of the four episodes of oil charge in Ordovician of Tahe oilfield occurred at the periods of the Caledonian, the Hercynian, the Indosinian, and the Yanshanian tectonic movements respectively. |
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