Sedimentary characteristics and genetic mechanism of the giant ancient pockmarks in the Qiongdongnan Basin, northern South China Sea
Sedimentary characteristics and genetic mechanism of the giant ancient pockmarks in the Qiongdongnan Basin, northern South China Sea
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DOI：
10.1007/s13131-022-2125-y
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发表时间：
2023-02
影响因子：
1.4
通讯作者：
Peng Xiong;Cong Cheng;Z. Kuang;Jinfeng Ren;Jinqiang Liang;H. Lai;Zigui Chen;Jiang Lu;Xiaoyu Fang;Tao Jiang
中科院分区：
文献类型：
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作者：
Peng Xiong;Cong Cheng;Z. Kuang;Jinfeng Ren;Jinqiang Liang;H. Lai;Zigui Chen;Jiang Lu;Xiaoyu Fang;Tao Jiang
中新世晚期，琼东南盆地发育了全球罕见的巨型古麻子。为了确定琼东南盆地莺歌海组巨型古麻点的沉积特征和成因机制，基于高分辨率三维地震资料和多属性融合技术，对古麻点的平面展布和地震相进行了分析，并将古麻点与河道、火山口、水合物坑等特征进行了对比。此外，我们还讨论了古麻子发育区的流体逃逸系统和古海底流活动的意义，并分析了古麻子对该地区古气候的影响。最后，提出了巨型古麻子的进化模型。该模型表明，琼东南盆地南部的巨型古麻点受到深部流体逃逸和古底流横向转换的双重影响。此外，巨大的古麻痕对中新世晚期大气CO2浓度有贡献，对当代深水石油勘探评价发挥了巨大作用。
In the late Miocene, giant ancient pockmarks, which are fairly rare globally, developed in the Qiongdongnan Basin. In this paper, to determine the sedimentary characteristics and genetic mechanism of these giant ancient pockmarks in the Yinggehai Formation of the Qiongdongnan Basin, based on high-resolution 3D seismic data and multiattribute fusion technologies, we analyzed the planar distribution and seismic facies of the ancient pockmarks and compared the characteristics of the ancient pockmarks with those of channels, craters, and hydrate pits. Moreover, we also discussed the implications of the fluid escape system and paleo-bottom current activity in the ancient pockmark development area and analyzed the influence of the ancient pockmarks on the paleoclimate in this region. Finally, an evolutionary model was proposed for the giant ancient pockmarks. This model shows that the giant ancient pockmarks in the southern Qiongdongnan Basin were affected by both deep fluid escape and lateral transformation of paleobottom currents. In addition, the giant ancient pockmarks contributed to the atmospheric CO2concentration in the late Miocene and played a great role in the contemporary evaluation of deepwater petroleum exploration.