低速泥岩识别技术在莺歌海盆地区域勘探中的应用  

The application of low-velocity shale identification technology in the Yinggehai basin area exploration

作　　者：张明伟 高凌 谭建财 潘光超 李文拓 ZHANG Mingwei;GAO Ling;TAN Jiancai;PAN Guangchao;LI Wentuo(Zhanjiang Branch,CNOOC China Limited,Zhanjiang 524057,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《中国矿业》2018年第11期145-150,共6页China Mining Magazine

基　　金：莺琼盆地高温高压天然气富集规律与勘探开发关键技术(三期)项目资助(编号:2016ZX05024-005)

摘　　要：亮点型低速泥岩地球物理特征表现为"两红夹一黑",低频、强振幅,有些具有明显的"V"型水道下切特征,吸收分析具有含烃显示,AVO为三类,与含气储层特征一致,给莺歌海盆地亮点识别气层技术带来很多陷阱。分析其成因可以概括为:欠压实、含气和构造裂缝成因。勘探中可以通过叠后和叠前方法的综合运用来区分储层和低速泥岩,排除亮点型低速泥岩陷阱的可能性,创新利用低速泥岩落实圈闭侧封有效性。The geophysical characteristics of the bright spot low-speed mudstone are mostly characterized by seismic response of“one black in two red”,low frequency and strong amplitude.And some may have obvious“V”channel incising features.The absorption analysis shows that the AVO is the type III,which is consistent with the characteristics of the gas-bearing reservoir.Therefore,it brings many traps to identify the gas bearing formation using the bright spot in the Yinggehai basin.Through the comprehensive analysis,it can be concluded that undercompaction,gas bearing and structural fractures are the three main causes of bright spot low-velocity mudstone in Yinggehai basin.It reveals by the research that the comprehensive utilization of pre-stack and post-stack methods can effectively distinguish the gas-bearing reservoir and low-velocity mudstone,and eliminate the possibility of the bright spot low-velocity mudstone trap.Through the practical application of this method in the area exploration,the false bright spot traps have been avoided effectively,and multiple traps have been defined creatively.Good application results have been obtained.

关 键 词：低速泥岩 欠压实 构造裂缝 

分 类 号：P168.13[天文地球—天文学]