[1]吴琼玲,肖张波,雷永昌,等.珠江口盆地陆丰22洼岩浆活动地震响应及发育模式[J].华南地震,2023,(02):20-34.[doi:10.13512/j.hndz.2023.02.03]
 WU Qiongling,XIAO Zhangbo,LEI Yongchang,et al.Seismic Response and Development Model of Magmatic Activity in Lufeng 22 Sag,Pearl River Mouth Basin[J].,2023,(02):20-34.[doi:10.13512/j.hndz.2023.02.03]
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珠江口盆地陆丰22洼岩浆活动地震响应及发育模式()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2023年02期
页码:
20-34
栏目:
地震科学研究
出版日期:
2023-06-20

文章信息/Info

Title:
Seismic Response and Development Model of Magmatic Activity in Lufeng 22 Sag,Pearl River Mouth Basin
文章编号:
1001-8662(2023)02-0020-15
作者:
吴琼玲肖张波雷永昌邱欣卫张素芳
中海石油(中国)有限公司深圳分公司,深圳 518000
Author(s):
WU QionglingXIAO ZhangboLEI YongchangQIU XinweiZHANG Sufang
Shenzhen Branch of CNOOC China Limited , Shenzhen 518000, China
关键词:
岩浆活动地震响应发育模式珠江口盆地陆丰22洼
Keywords:
Magmatic activitySeismic responseDevelopment modelPearl River Mouth BasinLufeng 22 sag
分类号:
P618.13
DOI:
10.13512/j.hndz.2023.02.03
文献标志码:
A
摘要:
珠江口盆地陆丰22洼岩浆活动频发,呈现强度大、多期次、岩性复杂等特征,一定程度影响洼陷结构、沉积充填和烃源岩的分布等。为明确低勘探程度区岩浆活动地震响应特征、发育强度和期次,利用周边钻井和高精度三维地震资料,采用地震属性配合地震相特征进行岩浆岩三维刻画,研究岩浆活动的地震响应特征、幕次划分、时空展布和发育模式,分析岩浆活动与洼陷构造演化历史的耦合关系。结果表明:陆丰22洼共识别出3类7种岩浆岩类型,通过井震对比建立了岩浆岩岩相的综合识别标准,不同的岩浆岩岩相具有特定的地震响应特征,共识别出陆丰22洼及周缘主要发育3期岩浆喷发和3期岩浆底辟;陆丰22洼各期次岩浆活动时间、分布位置、活动类型和活动强度存在较大差异,其中文六段岩浆喷发规模最大,主要分布在洼陷的西侧,文六段和文四段岩浆底辟规模最大,主要分布在洼陷内部及南缘,整体呈现北东东—南西西向,与洼陷展布方向较为一致;陆丰22洼共发育4期次岩浆活动,包括3期与深大断裂伴生的以裂隙式喷发模式为主的岩浆喷发活动,3期与区域构造运动相伴生的岩浆底辟,对应陆丰地区古近系经历的4次大规模的构造运动,每一期岩浆活动都与区域的构造演化联系紧密,空间上具有耦合关系。此研究成果有利于指导低勘探程度区的岩浆识别和规律研究,并为后续洼陷结构解剖、古地理格局恢复、烃源分布和油气勘探提供参考。
Abstract:
Lufeng 22 sag in the Pearl River Mouth Basin is characterized by frequent magmatic activity,with high intensity, multiple stages and complex lithology, which to some extent affects the depression structure, sedimentary filling and distribution of hydrocarbon source rocks. In order to clarify the seismic response characteristics, development intensity and stage of magmatic activity in low exploration degree area, using the surrounding drilling and high-precision 3D seismic data, the seismic attributes and seismic facies characteristics are used to carry out the 3D characterization method of magmatic rock to study the seismic response characteristics, episode division,spatial and temporal distribution and development mode of magmatic activity,and to analyze the coupling relationship between magmatic activity and the evolution history of the depression structure. The results show that 7 types of magmatic rocks in 3 categories are identified in Lufeng 22 sag, and the comprehensive identification standard of magmatic lithofacies is established through well-seismic comparison. Different magmatic rock subfacies have specific seismic response characteristics, and three phases of magmatic eruption and three phases of magmatic diapir are identified in Lufeng 22 sag and its periphery. There are great differences in the time, distribution location,activity type and intensity of magmatic activities in different stages of Lufeng 22 sag. Among them,the magma eruption scale of the sixth member of the Wenchang Formation is the largest,mainly distributed in the west side of the sag,and the magma diapir scale of the sixth and fourth members of the Wenchang Formation is the largest, mainly distributed in the interior and southern margin of the sag, showing the overall NEE-SWW direction,which is relatively consistent with the distribution direction of the sag. There are four stages of magmatic activities in Lufeng 22 sag,including three stages of magmatic eruption associated with deep faults,mainly in the form of fissure eruption mode, and three stages of magmatic diapir associated with regional tectonic movement, corresponding to four large-scale tectonic movements experienced by the Paleogene in Lufeng area. Each stage of magmatic activity is closely related to regional tectonic evolution,and there is a coupling relationship in space. The research results are conductive to guide the magma identification and law research of low exploration degree areas, and provide a reference for the subsequent sag structure anatomy, paleogeographic pattern restoration, hydrocarbon source distribution and oil and gas exploration.

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备注/Memo

备注/Memo:
收稿日期:2023-03-12基金项目:中国海洋石油集团有限公司“十四五”重大科技项目“中国近海新区新领域勘探技术”(KJGG-2022-0301);中国海洋石油有限公司前瞻基础研究项目“珠一坳陷隐伏断裂带特征及其控洼控藏作用研究”(KJQZ-2023-2001)联合资助。作者简介:吴琼玲(1987-),女,工程师,主要从事石油地质综合研究工作。E-mail:wuql16@cnooc.com.cn
更新日期/Last Update: 2023-06-15