油田密井网条件下井震匹配构造表征技术及应用

Structure characterization technology and application of well seismic matching under dense well pattern in oilfield

特高含水老油田井网密,剩余油高效挖潜要求精细刻画构造在三维空间展布特征。在对油田资料信息特点、开发需求以及构造解释和构造建模两种方法在构造表征方面的优势与不足分析基础上,总结出井震匹配构造表征方法。方法包含不同井网井震标定及层位解释、断点落实及断层解释、动态信息断层检验、深度域断点二次组合、井震匹配断层建模,地震约束层位建模6个关键步骤,详细分析每个步骤中井震匹配的关键要素。该方法将地震资料空间识别构造特征的优势和井信息在构造表征中的定位、判别作用结合起来,对断层及微幅度构造进行准确描述。结果表明,采用该方法建立的构造模型精度高,对剩余油精准预测及挖潜有积极的指导作用。

The dense well pattern of extra-high water cut old oilfields requires fine characterization of the distribution characteristics of structures in three-dimensional space to efficiently tap remaining oil.Based on the analysis of the advantages and disadvantages of oilfield data information characteristics,development requirements,structural interpretation and structural modeling in structural characterization,the well seismic matching structural characterization method is summarized.The method includes six key steps:well seismic calibration and horizon interpretation of different well patterns,implementation of breakpoints and fault interpretation,dynamic information fault inspection,secondary combination of breakpoints in the depth domain,well seismic matching fault modeling,and seismic constrained horizon modeling.The key elements of well seismic matching in each step are analyzed in detail.This method accurately describes faults and micro amplitude structuresby combining the advantages of spatial identification of structural characteristics of seismic data with the positioning and discrimination of well information in structural characterization.The application of structural characterization results in actual blocks shows that the structural model established by this method has high accuracy and plays a positive guiding role in the accurate prediction of remaining oil and tapping potential.