埕北30潜山太古宇储集层预测

Prediction of Archaeozoic PR reservoir bed in Chengbei 30 buried hill

埕北 30潜山处于胜利探区埕岛油田主体的东部 ,具有中生界、古生界和太古宇 3层结构。太古宇为被断层复杂化的花岗片麻岩 ,经多期风化剥蚀 ,各种缝、洞、孔极其发育。主要预测太古宇储集层 ,在综合地质研究的基础上 ,利用叠前深度偏移地震资料 ,将精细构造解释与三维地质建模技术相结合 ,建立了 30 0 0m以下深度潜山内幕的准确模型 ;用波阻抗合成声波反演技术预测太古宇风化壳的低速储集层分布及其孔隙度、渗透率 ,用相干分析技术预测高角度缝分布。经CB30 3井钻探结果验证 ,深度预测误差为 0 .4%,厚度预测误差为 15 %,预测效果较好。图 8参

The Chengbei No.30 buried hill locates in the east of the major part of Chengdao oil field in Shengli exploration area, with three structures in age of Mesozoic, Paleozoic and Archaeological, respectively. The Archaeological stratum is of granite gneiss with complex faults and excellent developed fracture, carven and pore since the multiphase weathering and erosion had happened in such a long geological history. Based on the comprehensive geologic research and analyses of the data of pre-stack depth migration seismic, an accurate 3-D model within the deep buried hills has been established. The distributions of the low-velocity favorable reservoir, porosity and permeability have been predicted by using the inversion technology of wave refraction. The fractures with big angle of inclination have also been predicted by utilizing the technology of coherent analysis and comprehensive geologic research. The excellent effective of prediction has been verified by the drilling of Chengbei well No. 303, in which the error of the depth prediction below 3000m is 0.4% and the error the thickness prediction is 15%, respectively only.