塔南凹陷南二段低渗透砂岩有利储层预测研究

塔南凹陷南二段由于构造特征复杂，储集层岩性种类多、物性差，有利储层预测难度大。根据岩性资料和试油结论对有利储层岩性分布情况和物性参数进行分析，在此基础上，对有利储层进行测井响应特征分析，利用多参数拟合曲线重构的思路对敏感曲线进行融合重构，以重构后曲线为约束进行地震反演有利储层预测。结果表明，南二段有利储层为高阻砾岩背景下的含油粉砂岩，单一的测井曲线无法将有利储层识别出来，选取对地层岩性及含油性有较好响应的自然电位曲线与深侧向电阻率曲线进行曲线融合重构，采用重构后拟合曲线约束地震反演进行有利储层预测，通过与井上砂岩数据进行误差统计，认为有利储层预测精度较高，该方法对油田后续井位部署有重要指导作用。

Study on prediction of favorable reservoirs of low permeability sandstone in South 2nd Section of Tanan Sag

Due to the complex tectonic characteristics of the South 2nd Section of the Tanan Sag，the reservoirs have many types of lithology and poor physical properties，it is difficult to predict favorable reservoirs.The lithological distribution and physical parameters of favorable reservoirs are analyzed through lithological data and oil testing conclusions.On this basis，logging response characteristics of favorable reservoirs are analyzed，sensitive curves are fused and reconstructed using the idea of multi-parameter fitting curve reconstruction，and favorable reservoir prediction through seismic inversion is performed using the reconstructed curve as a constraint.The results show that the favorable reservoir in South 2nd Section is oil-bearing siltstone under the background of high resistivity conglomerate，and a single logging curve cannot identify the favorable reservoir.The natural potential curve and deep lateral resistivity curve that have a good response to formation lithology and oil content are selected for curve fusion reconstruction，and the reconstructed fitting curve is used to constrain seismic inversion for favorable reservoir prediction.Error statistics are made with the sandstone data in the well.The prediction accuracy of favorable reservoirs is high，and this method has an important guiding role for subsequent well location deployment in the oilfield.