莺琼结合部气烟囱群地震响应特征

doi:10.3969/j.issn.1006-6535.2020.05.005

摘要/Abstract

摘要： 南海北部莺歌海盆地与琼东南盆地的交接部位存在多个地震模糊带异常体,而围区模糊体类型众多,西部莺歌海盆地发育底辟、海底麻坑、油气苗渗漏系统,北部海南隆起火山活动频繁,东部琼东南盆地发育古潜山群、火山,该区勘探程度低,近物源封盖条件匮乏。针对该区模糊带地质类型归属不清的问题,分析模糊带的地震反射特征及与围岩接触关系,总结各类可造成地震模糊的地质异常体的形成机制及其演化规律,类比分析异常体的地震相,并对该区异常体进行了三维可视化刻划表征。研究认为:这些模糊带具有规模小、无岩浆囊、根部浅等赋存特征,结合钻井资料分析,将这些模糊带定性为气烟囱。该区气烟囱成群成带分布,第四纪晚期仍在活动,油气运移活跃,是有利油气富集区。研究结果表明该区具有较好的勘探前景,圈闭条件好的目标可作为下步勘探突破方向。

关键词: 气烟囱, 底辟, 火山, 地震相类比, 莺琼结合部, 油气苗

Abstract: There are several anomalies in seismic fuzzy zones at the junction region of the Yinggehai Basin and the Qiongdongnan Basin in the northern South China Sea.There are many types of fuzzy bodies in the peripheral zones. Diapirs, submarine pockmarks and oil and gas seepage systems are developed in the western Yinggehai Basin. Volcanic activity was frequent in the northern Hainan uplift. Buried hill groups and volcanoes are developed in the eastern Qiongdongnan Basin. The exploration degree in this area is low, and the sealing conditions are scarce as the result of being near the provenance. Aiming at the problem that the geological types of the fuzzy zones are not clearly assigned in this area, the seismic response characteristics of the fuzzy zones are summarized. Combined with the formation mechanism and evolution law of various geological anomaly bodies, analogy analysis of seismic facies of the anomaly bodies in the peripheral zones was conducted, and the three-dimensional visualization characterization of the anomaly bodies was carried out. The study shows that these fuzzy zones have the characteristics of small scale, no magma capsule and shallow root, etc. Combined with the analysis of drilling data, these fuzzy zones are characterized as gas chimneys. The gas chimneys in this area are distributed in groups and zones, and are still active during the Late Quaternary, with active oil and gas migration, thus they are favorable oil and gas enrichment zones. The research results show that this area has a better exploration prospect, and the targets with good trap conditions can be used as the breakthrough direction for next exploration.

Key words: gas chimney, diapir, volcano, seismic facies analogy, junction region of Yinggehai-Qiongdongnan Basins, oil and gas seepage

中图分类号:

TE122

宋瑞有, 胡林, 黄义文, 胡潜伟, 侯静娴. 莺琼结合部气烟囱群地震响应特征[J]. 特种油气藏, 2020, 27(5): 30-37.

Song Ruiyou, Hu Lin, Huang Yiwen, Hu Qianwei, Hou Jingxian. Seismic Response Characteristics of Gas Chimneys in Junction Region of Yinggehai-Qiongdongnan Basins[J]. Special Oil & Gas Reservoirs, 2020, 27(5): 30-37.

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