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Modeling Effect of Invaded Zone on SP Log with Finite Difference Method
Author(s): 
Pages: 164-168
Year: Issue:  2
Journal: WELL LOGGING TECHNOLOGY

Keyword:  测井解释电化学有限差分法自然电位侵入带;
Abstract: 自然电位与地层流体的矿化度有密切关系,侵入带中泥浆滤液的矿化度对自然电位测井有较大的影响.在近年来提出的侵人带中泥浆滤液矿化度是渐变而非突变的自然电场模型的基础上,用有限差分法模拟了不同泥浆矿化度及侵入深度的侵入带对自然电位的影响,得到以下结论:侵入带不影响自然电位测井曲线对地层中点对称和在砂泥岩地层界面处变化明显这2个特征;当砂岩中地层水矿化度大于泥浆矿化度时,在不同的侵入深度及泥浆滤液与地层水矿化度的比值下,自然电位曲线的幅度都随着泥浆矿化度及侵入深度的增大而变小;在侵入带深度以及泥浆矿化度和地层水矿化度都不变的情况下,侵入带中流体矿化度的变化越平缓,其自然电位的幅度越小.
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