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高分辨率层序地层学在八区下乌尔禾组油藏研究中的应用
【作者】 丁振华；
【作者基本信息】 西南石油大学 ， 石油与天然气工程， 2009， 硕士
【摘要】 二叠系乌尔禾组是准噶尔盆地西北缘砾岩储层重要的产油层系之一,其中八区下乌尔禾组储层特征典型且石油储量规模巨大。由于沉积厚度大,层系划分过粗,造成了在生产过程中相当数量的井注采不对应,水驱效果较差。近年来,高分辨率层序地层学在地层划分方面显示出了其优越性,已成为建立地层格架的首选方法和技术。运用高分辨率层序地层学理论和技术,通过岩心、测井、三维地震资料的综合应用,建立了全区精细地层格架,确定下乌尔禾组三种沉积相类型,揭示精细地层格架内沉积微相及砂体的展布规律,为八区下乌尔禾组油藏开发调整方案的制定提供地质依据,并在现场实施中取得很好效果。同时,本文的研究理论、方法对同类型油藏的细分层、沉积微相研究也具有指导意义。取得的主要成果如下:(1)以层序界面特征研究为基础,将下乌尔禾组划分为1个二级层序、2个三级层序、22个准层序。在三级层序Ⅰ中识别出低位、水进、高位三个体系域:层序Ⅱ中则包括水进、高位两个体系域。(2)综合能谱测井、组合测井及地震资料,结合沉积演化特征,将下乌尔禾组划分为5个段、22个小层。5个段分别与层序地层的5个体系域相对应,22个小层对应于22个准层序。通过深入研究测井响应特征,选取对比标志层,并充分利用地震资料,对全区进行了地层划分对比。(3)以岩心观察和分析为依据,确立了岩心微相类型,建立了沉积微相与测井响应之间的组合关系模式,并对全区进行了测井沉积微相的处理和解释。以小层为单元,划分了沉积微相,进行了井间及空间相分布预测,揭示了相带空间展布特征。(4)现场实施表明,本次油藏描述工作符合油藏实际,有效指导了八区下乌尔禾组油藏三次加密调整。
【Abstract】 Wuerhe formation in Permian is one of the most important conglomerate reservoir productive series in northwestern margin of Junggar basin, especially in 8th District, it develops typical reservoir in lower Wuerhe formation and has an enormous oil reserve. There display voidage-injection imbalance and water-flooding ineffectiveness in many well when product, because of the thick sedimentation and rough subdivision of strata series. In recent years, high resolution sequence stratigraphy indicates superiority in subdivision of strata, and become the premier way to build strata framework.Based on high resolution sequence stratigraphy theory and comprehensive application of core, logging and 3D seismic data, build fine strata framework in the area, divide three types of microfacies in lower Wuerhe formation, reveal the distribution of microfacies and sandy body inner fine strata framework. It provides a geological foundation for development adjustment scheme in 8th District for lower Wuerhe formation and also obtains effective result in field. Meanwhile, all the achievement of research theory and method have inductive signification for other similar reservoir in fine subdivision and microfacies.There obtain many achievements in the dissertation, such as:(1)According to sequence interface research, it can be divided into one second-order sequence, two third-order sequence, and twenty two subsequences for lower Wuerhe formation. Identify low stand system tract, transgressive system tract, high stand system tract in I # third-order sequence, and transgressive, high system tracts in II # third-order sequence.(2) Based on energy integral logging, combination logging and seismic data, also sedimentation characteristic, lower Wuerhe formation divided into five member, twenty two sublayers, which corresponded to the five tracts and twenty two subsequences. By the research of logging response and comparison marker bed, using seismic data, establish strata comparison framework in the entire district.(3)Establish microfacies type according to core reserve and analysis, and build combination model between microfacies and logging response. Process and interpret all the logging and microfacies data at last. Identified microfacies type inner sublayer, predict and reveal facies distribution in interwell and space.(4)It proved in field implementation that the reservoir description coincide with the real character, and will induct the third infilling adjustment for lower Wuerhe formation in 8th District.