位于琼东南盆地中央峡谷的陵水17-2气田是我国海域自营勘探发现的第一个深水大气田,其储层主要为重力流沉积.基于研究区黄流组6口井的随钻电阻率成像测井、录井、地震、岩心和井壁取心等资料,通过岩心刻度成像资料实现全井段的岩性和沉积构造等成像地质刻度,并结合地震资料分析砂体分布和演化规律.结果表明:研究区黄流组主要发育块状构造-叠合层理、变形层理-块状构造、叠合层理-层状构造等3种沉积构造组合以及滑塌沉积、砂质碎屑流沉积、泥质碎屑流沉积和砂质浊流沉积等4种重力流沉积类型;主要发育轴向充填砂体、点砂坝、天然堤和水道充填砂体,其中研究区中段以点砂坝沉积为主,东段和西段以天然堤砂体为主;研究区重力流沉积受峡谷壁的限制作用,形成独特的多期弯曲水道沉积叠加的峡谷充填模式,其中点砂坝和天然堤砂体圈闭条件好、储层物性好,勘探潜力大.%LS17-2 gas field,located in Central Canyon area of Qiongdongnan Basin,is the first large deep water gas field discovered through self-operated exploration in the waters of China.Its reservoir is mainly formed due to gravity flow deposition.Based on the LWD resistivity imaging log,mud logging,seismic,core and wellbore coring of 6 wells in Huangliu Formation in the study area,imaging geological scale for the lithology and sedimentary tectonic of the whole well is achieved through the core scale imaging data,and analysis of the sand body distribution and evolution rule is carried out with the seismic data.The results show that Huangliu Formation in the study area is mainly composed of three sedimentary assemblages,namely massive structure-laminated bedding,deformed bedding-massive structure,laminated bedding-layered structure,and four kinds of gravity flow sedimentary types including slump sedimentation,sandy debris flow sedimentation,muddy debris flow sedimentation and turbidity flow sedimentation;mainly axially filled sand body,point bars,natural dike and channel filling sand body were developed,with middle section of study area dominated by point bars,and east and west sections dominated by natural dike sand bodies.The gravity flow deposition in the study area is restricted by the canyon wall,forming a unique canyon filling mode with superimposed multi-period meandering channel sedimentation,in which the point bar and the natural dike have favorable trapping conditions,good reservoir physical properties and great exploration potential.
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