多观测圈定琼东南盆地冷渗系统特征

IF 3.6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Xiujuan Wang , Wenlu Wang , Jiapeng Jin , Guangxu Zhang , Zhendong Luan , Chaolun Li , Minxiao Wang , Zhengyi Zhang , Bo Liu , Wei Li , Sanzhong Li
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引用次数: 0

摘要

利用三维地震资料、地球物理属性和现场观测资料对琼东南盆地冷渗进行了识别。通过识别断层、裂缝和储层物性,利用振幅、倾角、相干性和声阻抗属性来描绘不同层间冷渗的空间变化。这些变化是由于天然气水合物的发生导致冷渗漏内部和外部的差异造成的,而冷渗漏内部和外部的质量输运沉积物(MTDs)分布广泛。主要目标是表征冷渗系统的各种特征,包括海底特征、管道系统,以及它们与天然气水合物和浅层天然气的潜在关系。此外,新的遥控潜水器(ROV)潜水已被用于区分与甲烷气泡羽流相关的两种不同的化学合成生物群落。一个群落代表活跃的冷渗层,其特征是在碳酸盐岩上或周围有大量的贻贝和蛤蜊;另一个群落代表古冷渗层,由于天然气水合物稳定带底部附近的圈闭气体泄漏而被天然气水合物钻探重新激活。已识别的冷渗漏均表现为弱振幅异常、拉升反射和烟囱状构造,位于琼东南盆地不同凹陷局部隆起以上的高振幅带内。随钻测井和取心数据在这些烟囱状结构中证实了具有不同形态的中高天然气水合物饱和度,以及与甲烷相关的碳酸盐,表明存在埋藏或活跃的冷渗漏。这些结果表明,冷渗活动受MTDs的影响,流体向上运移与BGHSZ以下深层或浅层气体运移密切相关,流体沿断裂和裂缝系统穿过MTDs,具有压力控制的气体渗流特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multiple observations to delineate the characteristics of cold seep system in the Qiongdongnan Basin
Cold seeps in the Qiongdongnan Basin have been identified from three-dimensional (3D) seismic data, geophysical attributes, and in situ observations. Amplitude, dip, coherence and acoustic impedance attributes are employed to delineate the spatial variations of cold seeps across different layers by identifying faults, fractures and reservoir properties. These variations arise from the differences inside and outside of cold seeps due to the occurrence of gas hydrate, where mass transport deposits (MTDs) are widely distributed. The primary objective is to characterize the diverse features of cold seep systems, including seafloor features, plumbing systems, and their potential relationships with gas hydrates and shallow gas. Moreover, new remotely operated vehicle (ROV) dives have been utilized to distinguish two distinct chemosynthetic biological communities associated with methane bubble plumes. One community represents an active cold seep, characterized by abundant mussels and clams on or around carbonates, while the other is a paleo-cold seep that has been reactivated by gas hydrate drilling due to the leakage of trapped gas near the base of gas hydrate stability zone. All identified cold seeps exhibit weak amplitude anomalies, pull-up reflections, and chimney-like structures, which are located within high amplitude zones above local uplift in different sags of the Qiongdongnan Basin. Logging-while-drilling and coring data within these chimney-like structures have confirmed moderate to high gas hydrate saturations with diverse morphologies, as well as methane-related carbonates, indicating the presence of buried or active cold seeps. These findings suggest that cold seep activity is influenced by MTDs and that the upward fluid migration is closely linked to deep gas or shallow gas below the BGHSZ, which penetrate through MTDs along fault and fracture systems, suggesting pressure-controlled gas seepage.
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来源期刊
Marine and Petroleum Geology
Marine and Petroleum Geology 地学-地球科学综合
CiteScore
8.80
自引率
14.30%
发文量
475
审稿时长
63 days
期刊介绍: Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.
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