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Analysis of the Offshore Oil or Gas Reservoirs' Spontaneous Potential Characteristic and Its Orgins
Author(s): 
Pages: 164-167
Year: Issue:  2
Journal: WELL LOGGING TECHNOLOGY

Keyword:  自然电位海上油气田油气水特征离子交换矿化度含水饱和度渤海油田;
Abstract: 渤海油田地层水矿化度低,砂岩自然电位正异常,油(气)层自然电位幅度随含水饱和度增大而增大.南海较多的油气田地层水与海水泥浆滤液矿化度相近,水层自然电位正异常,油(气)层表现为负异常,含烃饱和度越大,负异常幅度越大.自然电场是在地层水与泥浆滤液浓度差作用下发生离子交换而形成的.油(气)层中的水主要是束缚水,与泥浆滤液发生离子交换能力弱,使自然电位幅度随含水饱和度增加而增大.油(气)层含盐量的差异、电阻率的高低也影响自然电位响应特征.根据多地区油(气)水层的自然电位测井曲线特征,提出自然电位与含水饱和度的经验关系式.
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