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琼东南盆地深水区上新世以来天然气水合物稳定域时空迁移及其分布特征

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江定川, 刘睿, 赵晓明, 方小宇, 葛家旺, 陆江, 姚哲, 朱继田, 宋鹏. 琼东南盆地深水区上新世以来天然气水合物稳定域时空迁移及其分布特征[J]. 海洋地质前沿, 2021, 37(7): 43-51. doi: 10.16028/j.1009-2722.2021.094
引用本文: 江定川, 刘睿, 赵晓明, 方小宇, 葛家旺, 陆江, 姚哲, 朱继田, 宋鹏. 琼东南盆地深水区上新世以来天然气水合物稳定域时空迁移及其分布特征[J]. 海洋地质前沿, 2021, 37(7): 43-51. doi: 10.16028/j.1009-2722.2021.094
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JIANG Dingchuan, LIU Rui, ZHAO Xiaoming, FANG Xiaoyu, GE Jiawang, LU Jiang, YAO Zhe, ZHU Jitian, SONG Peng. DYNAMIC MIGRATION OF GAS HYDRATE STABILITY ZONE IN THE DEEP WATER AREAS OF THE QIONGDONGNAN BASIN SINCE PLIOCENE AND ITS DISTRIBUTION PATTERN[J]. Marine Geology Frontiers, 2021, 37(7): 43-51. doi: 10.16028/j.1009-2722.2021.094
Citation: JIANG Dingchuan, LIU Rui, ZHAO Xiaoming, FANG Xiaoyu, GE Jiawang, LU Jiang, YAO Zhe, ZHU Jitian, SONG Peng. DYNAMIC MIGRATION OF GAS HYDRATE STABILITY ZONE IN THE DEEP WATER AREAS OF THE QIONGDONGNAN BASIN SINCE PLIOCENE AND ITS DISTRIBUTION PATTERN[J]. Marine Geology Frontiers, 2021, 37(7): 43-51. doi: 10.16028/j.1009-2722.2021.094
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琼东南盆地深水区上新世以来天然气水合物稳定域时空迁移及其分布特征

  • 1.

    南方海洋科学与工程广东省实验室（湛江），湛江 524000

  • 2.

    西南石油大学地球科学与技术学院，成都 610500

  • 3.

    中海石油（中国）有限公司湛江分公司，湛江 524057

  • 基金项目: 南方海洋科学与工程广东省实验室（湛江）“南海水合物富集规律及固态流化开采机理研究（一期）”（ZJW-2019-03）；国家自然科学基金（42072184，41702157）
详细信息
    作者简介: 江定川（1997—），男，在读硕士，矿产普查与勘探专业. E-mail：1924818601@qq.com
    通讯作者: 刘睿(1988—)，男，博士，副研究员，主要从事石油与天然气地质学教学与科研工作. E-mail：liurui@outlook.com

  • 中图分类号: P744.4；P618.13

DYNAMIC MIGRATION OF GAS HYDRATE STABILITY ZONE IN THE DEEP WATER AREAS OF THE QIONGDONGNAN BASIN SINCE PLIOCENE AND ITS DISTRIBUTION PATTERN

  • 1.

    Guangdong Laboratory of Southern Marine Science and Engineering-Zhanjiang, Zhanjiang 524000, China

  • 2.

    School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

  • 3.

    Zhanjiang Branch of CNOOC Limited, Zhanjiang 524057, China

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    摘要

  • 琼东南盆地深水区天然气水合物富集条件优越，具有巨大的勘探开发前景。基于近年来新获取的海洋地质地球物理关键参数，反演了琼东南盆地深水区上新世（约5 Ma）以来的天然气水合物稳定域迁移过程。研究表明：琼东南盆地现今天然气水合物稳定域主要存在于水深>600 m的海底，约在水深1 800～2 400 m处水合物稳定域厚度达到最大值，约190 m；冰期海平面下降导致水合物稳定域向深海平原迁移，而陆坡-深海平原转换带的水合物稳定域厚度则相对于现今减薄约80 m；岩浆热事件导致深海平原水合物稳定域厚度减薄约50 m，天然气水合物随之分解后释放大量气体导致多边形断层形成。

    The deepwater area of the Qiongdongnan Basin is beneficial to the enrichment of natural gas hydrate, where great potential occurs for commercial exploration and development of the hydrate. Utilizing the key parameters obtained in recent years, the dynamic migration of gas hydrate stability zone in the deepwater area of the basin since Pliocene (approximate 5 Ma) is carefully studied in this paper. The results suggest that the gas hydrate stability zone in the Qiongdongnan Basin currently occurs under the seafloor with a water depth >600 m and the maximum thickness may approach 190 m in the area with water depths around 800～2 400 m. Sea level falling during the glacial period might drive the gas hydrate stability zone migrating toward the abyssal plain, and there was an approximately 80 m reduction of gas hydrate stability zone in the transitional zone between the continental slope and abyssal plain. Thickness of the gas hydrate stability zone in the abyssal plain was thinned by approximately 50 m due to magmatic thermal events, and hydrate decomposition may cause the formation of polygonal faults.

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  • 图 1  琼东南盆地构造区划与典型凹陷结构地震剖面

    Figure 1. 

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    图 2  南海西北部沉积浅层（<100 mbsf）实测地温梯度与浅层（<100 mbsf）、深层（>1 000 mbsf）地温梯度差异机制示意图

    Figure 2. 

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    图 3  琼东南盆地水合物钻井样品天然气组分[13, 15]

    Figure 3. 

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    图 4  琼东南盆地海底温压条件及天然气水合物相边界

    Figure 4. 

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    图 5  琼东南盆地深水区地层温度梯度与天然气水合物稳定域（GHSZ）厚度

    Figure 5. 

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    图 6  琼东南盆地地震剖面中天然气水合物稳定域（GHSZ）与似海底反射（BSR）分布

    Figure 6. 

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    图 7  南海北部近500 ka以来的表层海水温度和海平面相对变化

    Figure 7. 

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    图 8  冰期与热事件作用下的天然气水合物稳定域厚度变化

    Figure 8. 

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    图 9  约5 Ma时期陆坡上倾方向的陆架边缘三角洲前缘滑塌与深海平原区的多边形断层

    Figure 9. 

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收稿日期:  2021-04-11
刊出日期:  2021-07-28

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