Classification and Distribution of Insulating Layers in Linnan Oilfield
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摘要: 在对临南油田储层砂岩小层及单砂体精细划分对比基础上, 通过对取心井的岩心观测和测井曲线分析, 对小砂层之间的隔层进行了系统研究, 按照岩性、岩相特征划分为3种主要类型: 泥岩类隔层(Ⅰ型隔层)、粉砂岩类隔层(Ⅱ型隔层)和钙质岩类隔层(Ⅲ型隔层).并根据沉积相特点把Ⅰ型隔层分为Ⅰ1型和Ⅰ2型, 把Ⅱ型隔层分为Ⅱ1型和Ⅱ2型.这些不同类型的隔层在测井曲线形态、沉积组合关系和空间展布上都具有不同的特点.隔层分布不连续会造成砂层在垂向上局部的相互连通, 上下砂层为砂坝砂体或河道砂体时, 形成连通的原因不同, 也分别具有各自不同的测井响应模式.根据隔层的岩性、电性特征和建立的连通模式, 从测井曲线出发, 对研究区内110多口井逐一进行了研究, 最终揭示了隔层的空间展布规律, 为剩余油预测和优化开采方案提供了依据.Abstract: Based on detailed division and correlation of reservoir sandstones in Linnan oilfield, the insulating layers are systemically studied through core observation and well logging analysis.According to lithology and lithofacies of the layers, they are divided into mudstone insulating layers(typeⅠ), siltstone ones(typeⅡ)and carbonate-bearing ones(typeⅢ). Because of facies variation, typeⅠ insulating layers are subdivided intoⅠ1 andⅠ2, and typeⅡ intoⅡ1 andⅡ2.All the insulating layers have differentwell logging features, sedimentary assemblages and spatial distributions. Discontinuity of the insulating layers could make nearby sand layers connected.The connection between sandbarbodies or channel sand ones shows differentorigins and distinguishedwell loggingmodels.The spatial distribution characteristics of each insulating layer are concluded by the research of more than 110 well loggings, thus providing basic data for the prediction of residual oil and selection of exploitation methods.
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图 1 各类型隔层的岩性和测井曲线特征
Fig. 1. Lithology and well logging features of different insulating layers
图 2 砂坝之间的连通模式
a.夏52-23井, 沙三中段三砂组的2小层1砂体和2小层2砂体在垂向上相互连通的测井曲线模式; b.夏52块沙三中段三砂组2小层1砂体和2小层2砂体之间相互连通区域在剖面上的分布特征
Fig. 2. Connection model between sandbar layers
图 3 河道砂体之间的连通模式
a.夏32-10井沙二段六砂组, 4小层1砂体和4小层2砂体在垂向上相互连通的测井曲线模式; b.夏32块沙二段六砂组4小层1砂体和4小层2砂体之间相互连通区域在剖面上的分布特征
Fig. 3. Connection models between fluvial sand bodies
图 4 临南油田夏52块沙三中段三砂组底部隔层等厚线
夏52块沙三中段三砂组底部的隔层只有Ⅰ1型一种类型, 并且该层隔层厚度大, 在整个研究区内稳定分布.这种类型的隔层可作为全区地层对比的标准层, 是各砂岩组之间的界线
Fig. 4. Isopachous map of insulating layers at bottom of the third sandstone group in Xia 52 area, Linnan oilfield
图 5 临南油田夏52块沙三中段三砂组4小层2砂体和5小层1砂体之间的隔层等厚线
夏52块沙三中段三砂组4小层2砂体和5小层1砂体之间有Ⅰ1和Ⅱ1两种类型的隔层, 其中Ⅱ1型隔层在三角洲的一侧发育, Ⅰ1型隔层则在向湖的一侧发育, 两者之间呈渐变过渡关系
Fig. 5. Isopachous map of insulating layers between 42 and 51 sand bodies of the third sandstone group in Xia 52 area, Linnan oilfield
图 6 临南油田夏52块沙三中段三砂组2小层1砂体和2小层2砂体之间的隔层等厚线
夏52块沙三中段三砂组2小层1砂体和2小层2砂体之间的隔层为Ⅱ1型, 该层隔层分布不稳定, 连续性差, 发育较多的连通区域
Fig. 6. Isopachous map of insulating layers between 21 and 22 sand bodies of the third sandstone group in Xia 52 area, Linnan oilfield
图 7 临南油田夏32块沙二段六砂组4小层1砂体和2砂体之间的隔层等厚线
夏32块沙二段六砂组4小层1砂体和2砂体之间的隔层以Ⅱ2型为主, 局部区域为Ⅰ2型, 由于河流的下切作用而发育较多的连通区域
Fig. 7. Isopachous map of insulating layers between 41 and 42 sand bodies of the sixth sandstone group in Xia 32 area, Linnan oilfield
表 1 隔层类型划分
Table 1. Classification of insulating layers
表 2 临南油田隔层分布特征
Table 2. Distribution characters of insulating layers in Linnan oilfield
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