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Reservoir Characteristics and Genetic Mechanisms of the Mesozoic Granite Buried Hills in the Deep-water of the Qiongdongnan Basin,Northern South China Sea
投稿时间:2020-05-22  修订日期:2020-11-07  点此下载全文
引用本文:YOU Li,XU Shouli,MAO Xuelian,ZHONG Jia,JIAO Yaoqi,XIONG Xiaofeng.2021.Reservoir Characteristics and Genetic Mechanisms of the Mesozoic Granite Buried Hills in the Deep-water of the Qiongdongnan Basin,Northern South China Sea[J].ACTA GEOLOGICA SINICA(English edition),95(1):259~267
摘要点击次数: 473
全文下载次数: 689
DOI:10.1111/1755-6724.14635
作者单位E-mail
YOU Li Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China youli1@cnooc.com.cn 
XU Shouli Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
MAO Xuelian Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
ZHONG Jia Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
JIAO Yaoqi Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
XIONG Xiaofeng Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
 
Author NameAffiliationE-mail
YOU Li Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China youli1@cnooc.com.cn 
XU Shouli Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
MAO Xuelian Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
ZHONG Jia Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
JIAO Yaoqi Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
XIONG Xiaofeng Chinese National Offshore Oil Limited Corporation (Zhanjiang),Zhanjiang,Guangdong 524057,China  
Abstract:Due to its structure,rock and mineral composition,fluid and other factors,the granite Buried Hill Reservoir is highly heterogeneous with a complex longitudinal structure and a reservoir space made up of a combination of dissolution pores and fractures.This paper is based on current understanding of tectonic evolution in the northern part of the South China Sea,in conjunction with the seismic phase characteristics.It is determined that the meshed fault system was formed by three stages of movement-tectonic compression orogeny during the Indochinese epoch,strike-slip compression-tension during the Yanshanian Period, early fracture extension activation during the Himalayan–which controlled the distribution of the Buried Hill Reservoir.Drilling revealed two types of buried hills,faulted anticline and fault horst,their longitudinal structure and the reservoir space type being significantly different.The mineral composition,reservoir space and diagenetic characteristics of the reservoir rocks and minerals were analyzed by lithogeochemistry,microsection and logging etc.,it thus being determined that the Mesozoic rocks of the Songnan Low Uplift in the Qiongdongnan Basin are mainly composed of syenogranite,granodiorite,monzogranite,which is the material basis for the development of the Buried Hill Reservoir.The content of felsic and other brittle minerals is more than 70%,making it easy for it to be transformed into fractures.At the same time, the weathering resistance of granodiorite and monzogranite is weaker than that of syenogranite,which is easily weathered and destroyed,forming a thick sand gravel weathering zone.With increasing depth of burial,weathering and dissolution gradually weaken,the deep acidic fluid improving the reservoir property of internal fractures and expanding the vertical distribution range of the reservoirs.The research results lay a foundation for the exploration of Buried Hill in the deep-water area of the Qiongdongnan Basin.
keywords:granite buried hill,weathering structure,deep-water,genetic mechanism,Qiongdongnan Basin
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