摘要
东营断陷湖盆广泛发育滨浅湖相的滩坝砂沉积。由于常规测井资料分辨率不够,储层的岩性识别及油气层解释面临较大困难。基于大量的岩心和常规测井资料对比分析,总结了该储集体各类岩性的测井响应特征;通过侵入特性分析和地层水性质分析,总结了该沉积体系下油层、干层及水层的识别方法。对于岩性识别,研究认为,在该地区,灰质砂岩中灰质非均匀分布,灰质含量的高低决定储层是否含油。对多口井的岩心观测表明,在含油井段当灰质含量大于20%时储层不含油;而泥质砂岩实际为很薄的砂岩、粉砂岩与泥岩形成的互层。对于流体识别研究认为,在高压油层下,泥浆对油气的驱替作用不大,侵入影响较小,表现在电阻率测井上深、中、浅等3种曲线难以区分;在含油水层及水层中,由于泥浆滤液与地层水为相溶流体,不仅存在驱替过程,同时存在离子扩散和对流质传现象,会出现浅探测电阻率明显高于深探测电阻率的现象。
Beach bar sandbodies of lake shore were widely developed in Dongying rift lacustrine basin. It is difficult to do the lithologic identification of reservoir and hydrocarbon reservoir interpretation because of the low resolution of conventional log data. Based on comparison of rock core with conventional log data, the log response characters of different lithologies of this reservoir was summed up. Through invasion feature and formation water character analysis, summarized are the identification method of oil layers, water layers and dry layers in this depositional system. As to lithologic identification, the research considers： in this area, limestone is heterogenetic dis tribution in lime-sandstone. The content of limestone is the main factor of oiliness. Observing a few rock cores demonstrate： when the limestone content of reservoir is more than 20%, the res ervoir is oil free; the shaly sand is actually very thin sandstone, siltstone and clay stone alternate layer. For fluid typing, the research considers： in high pressure oil layers, the displacement action of mud to hydrocarbon is not strong, and invasion affection is small, the difficult discrimination of deep, middle, shallow resistivity logging curves supports this viewpoint. In petroliferous water layers and water layers, the mud filtrate and formation water is intersoluble, not only the displacement process is subsistent, but also simultaneously ion diffusion and convective mass transfer phenomenon are subsistent.
出处
《测井技术》
CAS
CSCD
北大核心
2009年第2期143-147,共5页
Well Logging Technology
基金
中国石化胜利油田分公司十一五攻关项目:油气薄互层测井识别与评价(课题编号YKK0709)
关键词
测井解释
东营凹陷
滩坝砂体
岩性识别
流体识别
log interpretation , Dongying sag, beach-bar sandbodies, lithologic identification, fluid typing
