COMPREHENSIVE EVALUATION OF HETEROGENEITY CONGLOMERATE RESERVOIRS——TAKING CONGLOMERATE RESERVOIRS IN QIZHONG AND QIDONG AREA OF KARAMAY OIL FIELD AS AN EXAMPLE
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摘要: 克拉玛依油田七中、东区砾岩储层以其特高非均质性和复模态孔隙结构特点区别于砂岩储层,受山麓洪积相带、成岩压实及后生成岩变化影响,岩矿组分差异大,颗粒大小不均匀,纵横向相带变化剧烈,层内、层间渗透性变化大。通过对反映砾岩储层特征的多种参数及评价指标的分析,利用砾岩储层储能参数、储量参数、油层分布、规模、连片性、钻遇率、渗透率及其非均质性定量评价指标体系,在该区克拉玛依组砾岩储层建立起综合评价参数、标准和权系数,利用灰色理论有机集成和综合了非均质砾岩储层的多种信息,对非均质砾岩储层进行了综合评价和分类描述。从而,从不同角度分析并阐明了该区非均质砾岩储层静态质量,从宏观上认识和评价微观结构特殊的砾岩储层及其非均质性,有效控制和划分了非均质砾岩储层开发的有利井区、层位及类型,为指导油田开发决策和增产措施提供了有利目标区。Abstract: Conglomerate reservoirs in Qizhong and Qidong area of Karamay Oil Field are different from sandstone ones due to extra-high heterogeneity and complex mode pore structure.Influenced by piedmont pluvial phase,diagenetic compact and epigenetic diagenetic change,the reservoir is characterized by obviously different rock and mineral components,unequal grain sizes,great changes of facies horizontally and vertically as well as changes of permeability in or between layers.It is established in this paper comprehensive evaluation parameter,criterion and weighting coefficient by quantitative evaluation index system of stored energy parameter,reserves parameter,reserves distribution,scales,connectivity,drilling meeting ratio,permeability and heterogeneity.Comprehensive evaluation and classification description of heterogeneity conglomerate reservoirs are also made with gray system.Hence it is analyzed and illustrated from different aspects the quiescent quality of heterogeneity conglomerate reservoirs in this area.Conglomerate reservoirs with special microcosmic construction are studied macroscopically.Potential wells,layers and types for heterogeneity conglomerate reservoir development are pointed out,providing guild for oil field exploration.
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