元坝长兴组生物礁储层精细雕刻技术

Fine depict of reef reservoirs in Changxing Formation,Yuanba area

元坝长兴组生物礁储层纵向上多期次叠加,内幕结构十分复杂,精细雕刻难度大。在实际开发生产中研究生物礁内幕结构可为井位调整优化和井轨迹设计钻遇优质储层提供重要依据。通过单井相识别生物礁发育层段、地震模型正演建立地震响应模式、古地貌分析、地震属性优选、储层多参数定量预测进行礁平面展布研究,并应用三维可视化技术对礁体内幕精细雕刻,形成了一套针对生物礁储层内幕结构的精细雕刻技术。应用该技术对元坝长兴组生物礁储层进行开发井位部署及井位优化调整,大大提高了优质储层的钻遇率,后期钻井预测厚度的符合率达88.6%。

Changxing reef reservoirs in Yuanba area are vertically superimposed on multiple stages,and their internal architectures are very complex.So it is difficult to finely depict them.In order to optimize well locations,we carry out a research on complicated reef reservoir geometry and propose an approach to depict reef reservoirs.This approach consist of:reef cognition with well facies,seismicresponse pattern building with forward modeling,reservoir horizontal distribution prediction with the analysis of ancient landform,seismic attributes,reservoir multi-parameters,and fine depict of reef internal architectures with 3D visualization.The proposed approach is applied to Changxing reef reservoirs in Yuanba area.Well deployment optimization based on our prediction greatly improves drilling results.The coincidence rate of reservoir thickness predicted by the proposed approach reaches 88.6%.