Reservoir forming conditions and key exploration technologies of Lingshui 17-2 giant gas field in deepwater area of Qiongdongnan Basin  

作　　者：Yuhong Xie Gongcheng Zhang Zhipeng Sun Qingbo Zeng Zhao Zhao Shuai Guo 

机构地区：[1]China National Offshore Oil Co.,Ltd.,Beijing,100028,China [2]Research Institue Co.Ltd,China National Offshore Oil Co.,Ltd.,Beijing,100028,China [3]Research Institute of Zhanjiang Branch,China National Offshore Oil Co.,Ltd.,Zhanjiang,524057,China

出　　处：《Petroleum Research》2019年第1期1-18,共18页石油研究（英文）

基　　金：The work was supported by China National Significant Science and Technology Project(No.2008ZX05025,No.2011ZX05025,No.2016ZX05026);China National Key Basic Research and Development Program(973 Program)(2009CB219400);Project of Ministry of Land and Resources of the People's Republic of China(XQ2004-05,XQ2007-05).

摘　　要：On September 15,2014,China National Offshore Oil Co.,Ltd announced that a high production of oil and gas flow of 1.6
106 m3/d was obtained in Well LS17-2-1 in deepwater area in northern South China Sea,which is the first great oil and gas discovery for self-run deepwater exploration in China sea areas,and a strategic breakthrough was made in natural gas exploration in deepwater area of Lingshui sag in Qiongdongnan Basin.Under the combined action of climax of international deepwater exploration,high oil prices,national demands of China,practical needs of exploration,breakthroughs in seismic exploration and testing technologies,innovations in geological cognition and breakthroughs in deepwater operation equipment,Lingshui 17-2 gas field is discovered.Among these factors,the innovation in reservoir forming geological cognition directly promotes the discovery.The quality of seismic data in the early time is poor,so key reservoir forming conditions such as effective source rocks,high quality reservoirs and oil-gas migration pathways are unable to be ascertained;with support of new seismic acquisition and processing technology,some researches show that Lingshui sag is a successive large and deep sag with an area of 5000 km2 and the maximum thickness of Cenozoic stratum of 13 km.In the Early Oligocene,the Lingshui sag was a semi-closed delta-estuarine environment,where the coalmeasure and marine mudstones in Lower Oligocene Yacheng Formation were developed.The Lingshui sag is a sag with high temperature,and the bottom temperature of source rocks in Yacheng Formation can exceed 250C,but the simulation experiment of hydrocarbon generation at high temperature indicates that the main part of this set of source rock is still in the gas-generation window,with resources of nearly 1 trillion cubic meters,so the Lingshui sag is a hydrocarbon-rich generation sag.In the Neogene,the axial canyon channel from the Thu Bon River in Vietnam passed through the Lingshui sag,and five stages of secondary channels were developed in the axi

关 键 词：Deepwater oil and gas Source rocks Lower limit of gas generation The central canyon Diapiric zone Migration pathway Lingshui sag Lingshui 17-2 giant gas field Qiongdongnan basin 

分 类 号：P61[天文地球—矿床学]