| 渤海湾盆地束鹿凹陷沙一段石盐岩中流体包裹体特征及其地质意义 |
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| 引用本文： | 赵艳军,刘成林,张华,王立成,丰勇,吴悠,刘宝坤.渤海湾盆地束鹿凹陷沙一段石盐岩中流体包裹体特征及其地质意义[J].地球科学,2014,39(10):1355-1363. |
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| 作者姓名： | 赵艳军 刘成林 张华 王立成 丰勇 吴悠 刘宝坤 |
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| 作者单位： | 1.中国地质科学院矿产资源研究所，国土资源部成矿作用与资源评价重点实验室，北京 100037 |
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| 基金项目： | 国家重点基础研究计划973项目(No.2011CB403007);国家自然科学基金项目(No.41302059) |
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| 摘 要： | 束鹿凹陷内古新统沙河街组一段石盐岩中发育了大量原生的人字形单一液相水溶液包裹体和次生油包裹体，这为深刻揭示凹陷内蒸发岩成因及油气运移、保存提供了有利条件.在流体包裹体岩相学研究的基础上，开展了流体包裹体均一温度测试、并恢复了钻井的埋藏史和包裹体捕获时间及古压力.研究表明石盐岩中与次生油包裹体同期的水溶液包裹体均一温度分为66.5~91.5 ℃和103.7~108.9 ℃两期，其对应的捕获时间分别为10.56~10.11 Ma和1.10 Ma，表明油气流体进入盐岩层的时间分别为馆陶组沉积的中晚期和更新统沉积期，与生烃史的研究结果基本吻合.石盐岩层中部利用包裹体模拟的古压力系数高达1.64，底部石盐岩中存在大量超压条件下形成的单一液相油包裹体，证明盐下存在超压系统，而超压系统的存在为油气的运移和保存提供了动力条件.
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| 关 键 词： | 石盐岩 油包裹体 古压力 沙一段 束鹿凹陷 石油地质 |
| 收稿时间： | 2014-02-23 |
Characteristics and Geological Significance of Fluid Inclusions in Halite of the First Member of Shahejie Formation in Shulu Depression,Bohai Bay Basin |
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| Abstract: | A large amount of primary single-phase aqueous fluid inclusions and secondary petroleum inclusions are discovered in the halite in the first member of Palaeogene Shahejie Formation in Shulu depression, which facilitates the determination of the origin of evaporite and the migration and preservation conditions of oil and gas. In this paper, the formation time and the trapping paleopressure of fluid inclusions and the burial history of oil and gas are analyzed by linking the homogenization temperature of both the primary single-phase aqueous fluid inclusions and secondary petroleum inclusions with the petrography of halite. As the results, the homogenization temperature of the aqueous inclusion, which is symbiosis with the petroleum inclusions, ranges from 66.5 to 91.5 ℃ and 103.7 to 108.9 ℃, respectively. The trapping time of the former is about 10.56 to 10.11 Ma and the trapping time of the latter is about 1.10 Ma. It is concluded that the time of oil and gas fluid entering into the salt rock is about the middle-late Guantao Formation and Pleistocene, which is also evidenced by the investigation of the oil and gas generation history. The paleopressure coefficient of the middle part of the salt rock modeled by fluid inclusions is up to 1.64, suggesting that there existed a hyperpressure system under the salt rock which probably facilitated the migration and preservation of oil and gas. |
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