古城油田泌125区块核三段Ⅴ油组边际储层界限识别方法  

Identification method of marginal reservoirs of V oil zone in Bi 125 block, Gucheng oilfield

作　　者：黄金山[1] 

机构地区：[1]中国石化股份公司油田事业部,北京100728

出　　处：《油气地质与采收率》2014年第3期28-32,112-113,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目"火山活动背景下优质储层发育机制--以海拉尔盆地贝中地区为例"(41302095)

摘　　要：古城油田泌125区块核三段Ⅴ油组存在泥岩低自然伽马现象,有效储层的自然伽马值范围宽,且与无效储层自然伽马值范围交叉;油藏埋藏浅,地层水矿化度低,自然电位幅度异常小,有效储层自然电位范围宽,且与无效储层自然电位范围交叉;2种主要岩性识别曲线相继失效或部分失效,使得研究区有效储层识别困难。根据目的层段无法给出有效储层确定性测井下限的现状,剖析了产生这种复杂现象的地质因素,结合实际资料,综合多种测井信息,经过去伪存真处理,建立了适合研究区特点、包含多种测井信息的自然伽马幅度异常边际界限模型、自然电位幅度异常边际界限模型和无效储层剔除界限。应用建立的边际储层识别模型,重新解释了研究区108口井,新增解释油层37层共26.4 m;剔除误解油层18层共15.6 m;修正了原来解释油层的厚度。建立的复杂岩性岩石边际储层识别模型,适用于快速沉积的扇三角洲体系,有望推广至冲积扇、水下扇等快速沉积体系。There are low-gamma ray mudstones present in V oil zone of Bi 125 block, and the natural gamma ray of effective reservoirs has a wide range which crosses with that of ineffective reservoirs; the reservoirs are shallow, the salinity of formation water is low, theamplitude anomaly of self-potential is minor and the self-potential of effective reservoirs also has a wide range and its range crosseswith that of invalid reservoirs. These two curves of identifying lithology are both or partially invalid, which makes it difficult to identifythe effective reservoirs in the area. According to the fact that there is no low limit of logging curves to determine effective reservoirs ofthe objective intervals, the geological factors causing the complex phenomenon have been studied, and together with the actual data, in-tegrated with the useful information contained in a variety of logging data, then, the models appropriate for the area have been estab-lished, including models of natural gamma amplitude anomaly marginal limits, self-potential amplitude anomaly marginal limits and in-valid reservoirs removal. The application of these models makes the logging interpretation of effective reservoirs in the area possibleand turns the adverse situation that the identification of effective reservoirs could only depend on coring and borehole log. With the ap-plication of the newly-established marginal reservoir identification model, 108 wells in the area have been reinterpreted, and 37 oil lay-ers, up to 26.4 m thick, have been added; moreover, the misinterpreted 18 oil layers, 15.6 m thick, have been removed; and the thick-ness of numerous pre-interpreted oil layers has been corrected. The established identification models of complex-lithology effectivereservoirs are suitable for the fast-deposited fan deltaic system and are expected to be applied to other fast-deposited systems such asalluvial fanandsubsea apron.

关 键 词：扇三角洲 低自然伽马泥岩 有效储层 边际储层界限识别 古城油田 

分 类 号：TE112.23[石油与天然气工程—油气勘探]