Fault⁃Landform Double Controlled Archean Buried⁃Hill Reservoir Integrated Prediction for BZ26⁃6 Oil Field, Bohai Bay
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摘要: 渤中26⁃6油田太古界潜山储层品质受风化程度与裂缝发育共同控制，为实现储层评价与储量动用，形成基于断-貌双控的太古界潜山储层综合预测技术. 潜山上覆地层时代关系与沉积厚度决定了潜山风化剥蚀程度，基于此通过古地貌恢复实现储层风化程度平面分区. 印支期形成的近东-西向高角度断裂与印支至喜山期长期活动的边界正断层对油田裂缝发育起重要控制作用，基于Radon变换与蚂蚁体技术实现裂缝发育平面预测. 以风化程度平面分区为低频，裂缝发育平面预测为高频，利用高阶小波变换技术实现高、低频信息有效融合，综合表征储层品质. 基于融合属性将储层划分为Ⅰ类、Ⅱ⁃1类与Ⅱ⁃2类，Ⅰ类储层品质最佳，为东营组地层沉积之前太古界潜山持续出露同时裂缝带发育区域. Ⅱ⁃1类储层品质次之，为沙河街组地层沉积之前太古界潜山持续出露同时裂缝带发育区域. Ⅱ⁃2类与Ⅱ⁃1类储层品质接近，为东营组地层沉积之前太古界潜山持续出露但裂缝带一般发育区域. 分类结果与测井及测试资料认识吻合，指导建立了油田储量动用策略，证实基于风化及裂缝发育主控因素开展地震储层预测，并基于属性融合方法实现结果综合的太古界潜山储层技术思路具有实用意义.Abstract: Archean buried⁃hill reservoir in BZ26⁃6, Bohai Bay is controlled by ancient landform and faults simultaneously. In order for reservoir evaluation and reserve production, we propose a fault⁃landform double controlledArchean buried⁃hill reservoir integrated prediction method. The composition of the overlying strata above the Archean buriedhill controls the weathering degree.Via restoration of ancient landform, we achieve reservoir plane division considering the weathering degree. Near east⁃west high⁃angle faults activated in Indosinian period and the normal fault continuously activated among Indosinian, Yanshanian and Himalayan periods control the fracture development, and we exploit the Radon transform and ant tracking methods to predict the favorable area of the fracture.In final, using the prediction of the weathering degree as low⁃frequency information, and the prediction of the fracture as high⁃frequency information, we exploiting the wavelet transform method to achieve the attribute fusion. Based on the fused attribute, the reservoir is classified as type Ⅰ, type Ⅱ⁃1 and type Ⅱ⁃2. The reservoir of type Ⅰ has the best quality, both the weathering degree and fracture development are relatively well, the reservoir of type Ⅱ⁃1 and Ⅱ⁃2 have relatively good quality, either weathering degree or fracture development is relatively well. The reservoir classification is coincided with the well logs and production test data, and helps to establish the reserve production strategy. It illustrates that exploiting the main controlling factors of weathering and fracture to guide seismic reservoir prediction, and using the attribute fusion to merge the results has a certain degree of practical significance.
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图 1 区域太古界潜山基底及油田构造位置
Fig. 1. Regional Archean buried⁃hill basement and structural location of the BZ26⁃6 oil field
图 2 太古界潜山上覆地层时代关系地震剖面
测线位置见图 1
Fig. 2. Times relationship of the overlying strata of Archaeozoic buried hill
图 3 研究区古地形图
a. 中生界沉积末期潜山古地形（T8⁃Tg8）; b. 古近系沙河街组沉积末期中生界古地形（T3⁃T8）; c. 古近系东营组沉积末期沙河街组古地形（T2⁃T3）
Fig. 3. Paleotopographic maps of the study area
图 4 太古界潜山风化程度平面分区（a）强风化区域（b）中风化区域（c）弱风化区域
Fig. 4. Reservoir classification considering the degree of weathering: (a) strongly weathered area, (b) moderately weathered area, and (c) weakly weathered area
图 5 太古界潜山储层风化程度平面综合分类属性
Fig. 5. The integrated reservoir classification considering weathering degree of Archaeozoic buried⁃hill reservoir
图 8 连井地震及Radon变换高陡反射刻画剖面
Fig. 8. Cross⁃well sections of seismic and Radon⁃transformed data
图 9 裂缝带预测属性
a. Radon变换平面属性；b. 蚂蚁体属性；c.Radon变换与蚂蚁体融合属性；属性提取时窗根据地质分层确定为Tg8层位至Tg8下飘120 ms
Fig. 9. Attributes of fracture prediction
图 10 基于Harr小波变换的地震属性融合流程图
Fig. 10. The flow chart of multiple attributes fusion based on high⁃order Harr wavelet
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