摘要
裂缝性致密砂岩储层基质物性较差,裂缝的发育丰度是影响储层产能的主要因素,如何准确评价裂缝有效性与储层产能是油田勘探开发面临的首要问题。在配套岩石物理实验的基础上,形成了表征孔隙结构特征的基质储层分类标准,建立了一套基于测井资料逐点评价基质储层类型的计算方法。通过不同探测尺度的声、电成像测井,构建了裂缝面法向应力与裂缝渗透率计算模型,结合试气测试资料,系统分析了裂缝走向与最大主应力夹角、裂缝渗透率、裂缝面法向应力、裂缝参数与米采气指数的关系,建立裂缝有效性分级评价方法与标准。在基质与裂缝分级评价的基础上建立基质储层与裂缝综合评价图版,形成了一套致密砂岩有效性综合评价标准。将该方法应用于新井解释评价中,评价结果与实际生产数据吻合,说明该方法可以综合评价储层的有效性,准确预测储层产气能力。
The physical property of matrix in the fractured tight sandstone reservoirs is poor,and the development degree of the fractures is the main influencing factors of reservoir productivity.How to evaluate the fracture effectiveness and reservoir productivity accurately is the critical issue in oilfield exploration and de-velopment.Based on the petrophysics experiment,the classification standard of the matrix reservoir was formed for charactering pore structure features,and a computational method for evaluating matrix reservoir type point by point based on log data was established.Through acoustic and electric imaging logging with various detect-ing scales,the calculation model of normal stress of fracture surface and permeability of the fractures was built.According to gas test data,the relationship between the fracture strike and the maximum principal stress angle,and between the fracture permeability,normal stress of the fracture surface,fracture parameters and gas productivity index per meter was analyzed systematically.An evaluation method and standard of the fracture effectiveness was established.Based on the grading evaluation of the matrix and fractures,a comprehensive evaluation chart of the matrix reservoirs and fractures was set up and comprehensive evaluation criterion for the effectiveness of the tight sandstone was formed.After this method was applied to interpretation and evalua-tion of new wells,the evaluation results coincided with the actual production data.It proved that this method can evaluate the effectiveness of the reservoirs comprehensively and predict the gas production capacity of the reservoirs accurately.
出处
《中外能源》
CAS
2017年第12期42-53,共12页
Sino-Global Energy
基金
中国石油天然气股份有限公司重大专项"塔里木油田勘探开发关键技术研究与应用"二期(编号:2014E-2014)课题研究成果之一
关键词
裂缝性致密砂岩
裂缝有效性
储层产能
基质储层
裂缝渗透率
综合评价标准
fractured tight sandstone
fracture effectiveness
reservoir productivity
matrix reservoir
fracture permeability
comprehensive evaluation criterion
