摘要
南海西部北部湾盆地乌石凹陷古近系流沙港组二段是近年来获得原油勘探发现的主要层系,发育扇三角洲沉积储层,高中低渗储层均有发育,非均质性强、产能差异大。为了精细表征流二段储层特征,首次在本地区将随钻高分辨率电阻率成像测井及元素俘获能谱测井引入到对沉积环境、构造特征、岩性分析、物性参数的研究中。结果表明,扇三角洲前缘水下分流河道为流二段有利储层,储层岩性以细砂岩和中砂岩为主,可见块状构造、变形层理、交错层理及平行层理发育,矿物类型主要为黏土矿物和硅质矿物,储层物性条件较好;流二段主要发育开启型和闭合型2种断层,开启型断层主要发育在砂岩中,闭合型断层主要发育在泥岩中;流二段砂体展布方向主要为近南、北2个方向,即物源方向为近南、北2个方向。随钻高分辨率电阻率成像测井与元素俘获能谱测井的综合应用,达到了乌石凹陷流二段储层精细表征的目的,为今后乌石凹陷流二段整体评价、目标优选和井位方案设计提供了强有力的参考依据。
The Second Member of Paleogene Liushagang Formation(Liu-2 Member)in Wushi sag of Beibuwan basin in western South China Sea is the main stratum discovered by oil exploration in recent years.The fan delta sedimentary reservoir was developed here,the high/middle/low permeability reservoirs were all developed,the heterogeneity is strong and the difference on production capacity is significant.In order to finely characterize the reservoir characteristics in the Liu-2 Member,the high-resolution resistivity imaging logging while drilling and the element-capture spectroscopy logging were introduced into the studies of sedimentary environment,structural features,lithology analysis and physical parameters for the first time in this area.The results show that the subaqueous distributary channel of the fan delta front is a favorable reservoir in the Liu-2 Member.The reservoir lithology is dominated by fine sandstone and medium sandstone,the development of blocky structure,deformed bedding,cross bedding and parallel bedding is observed,the mineral types are mainly clay mineral and siliceous mineral,and the reservoir physical properties are good.Mainly two types of faults,i.e.,the open-type and closed-type faults were developed in the Liu-2 Member.The open-type fault was mainly developed in sandstones,and the closed-type fault was mainly developed in mudstones.The sand body distribution in the Liu-2 Member is mainly in the south and north directions,that is,the provenance is in the south and north directions.The comprehensive application of high-resolution resistivity imaging logging while drilling and element-capture spectroscopy logging has achieved the purpose of fine characterization of Liu-2 Member in the Wushi sag,which will provide strong reference for the overall evaluation,target optimization and well location design of the Liu-2 Member in the Wushi sag.
作者
郭书生
高永德
曲长伟
蔡惠敏
孙本强
刘延梅
GUO Shusheng;GAO Yongde;QU Changwei;CAI Huimin;SUN Benqiang;LIU Yanmei(CNOOC China Limited,Zhanjiang Branch,Zhanjiang,Guangdong 524057,China;Schlumberger China,Beijing 100015,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2019年第2期39-50,共12页
China Offshore Oil and Gas
关键词
乌石凹陷
流沙港组二段
储层精细表征
高分辨率电阻率成像测井
元素俘获能谱测井
Wushi sag
Second Member of Liushagang Formation(Liu-2 Member)
fine reservoir characterization
high-resolution resistivity imaging logging
elemental capture spectroscopy logging
