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大北气田属于裂缝型致密砂岩储层,裂缝发育程度直接影响了天然气的发现,以及后期产能建设,因而对裂缝的正确描述意义重大。目前一般用裂缝密度描述裂缝的发育程度,但该方法存在着固有的局限性:只能应用于野外露头、岩心和成像测井方面。针对井下裂缝描述,岩心先天具有量少、代表性差的缺陷,而利用成像测井资料解释裂缝,对资料、人员要求高,解释结果随机性相对较大,并且成像测井成本高,资料缺乏。因此,通过实践,在裂缝的研究过程中,引入了分形学的概念。根据分形学的定义,利用常规测井资料,结合大北气田裂缝在常规测井曲线上的反应特征,利用R/S分析对大北地区目的层段裂缝发育程度进行了定量分析。经钻井、岩心等验证,效果良好,表明在大北气田,应用R/S方法对岩心进行定量描述是一个行之有效的方法。
Dabei gas field belongs to the fractured sandstone sandstone reservoirs. The degree of fracture development has a direct impact on the discovery of natural gas and the post-production capacity. Therefore, the correct description of fractures is of great significance. At present, fracture development is generally described by crack density. However, this method has inherent limitations: it can only be applied to outcrops, cores and imaging logs. In view of the description of downhole fractures, there are few congenital core defects and poor representativeness. However, imaging logging data are used to interpret fractures. Therefore, data and personnel are highly demanding. Interpretation results are relatively random, and imaging logging costs are high and data are scarce. Therefore, through the practice, the concept of fractal has been introduced in the research of fractures. According to the definition of fractal, using the conventional logging data, combined with the reaction characteristics of the conventional well logging curves in the Dabei gas field, the degree of fracture development in the target layer of Dabei area was quantitatively analyzed by R / S analysis. After drilling and core verification, the result is good, which shows that using R / S method to describe the core quantitatively is an effective method in Dabei gas field.