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应用表征孔缝储集性的定量参数———分维数,将奥陶系古风化壳马五1—马五4储集层裂缝分为7种组构类型,孔洞分为8种组构类型,计算了各组构类型的分维数。计算结果表明,裂缝组构类型中的网状缝、孔洞组构类型中的溶蚀孔洞的分维数最高,对油气储集最有利。从分维数平面分布特征来看,盆地中部地区裂缝、孔洞分维数均比东部高,在中部和东部之间存在一个南北向的分维数低值区,为区域岩性致密带。把分维数作为储集层评价的主要参数,结合渗透率、白云石和方解石饱和指数等资料,应用灰色系统判别决策方法,对鄂尔多斯盆地中东部古风化壳气藏的主要产层———马五31储集层进行了分区预测评价,认为陕9—陕117井区、陕100—陕109井区为有利储集层发育区,陕188—陕50井区、大保当地区为较有利储集层发育区。图2表4参4(马振芳摘)
By using fractal dimension, which is a quantitative parameter that characterizes the reservoir porosity, the fractures of Ma Wu-1-Ma-54 reservoir in the Ordovician paleokaryon crust are divided into seven types of structures. The pores are divided into eight types of structures Type, calculated the fractal dimension of each fabric type. The calculated results show that fractured vugs in fractures have the highest fractal dimension, which is most favorable for hydrocarbon accumulation. According to the fractal dimension distribution, the fractures and fractal dimension in the central part of the basin are higher than the east part. There is a north-south fractal low value region between the middle and the east, which is the lithologic tight belt. Taking the fractal dimension as the main parameter of reservoir evaluation, combined with the permeability, dolomite and calcite saturation index and other data, the gray system discriminant decision-making method is applied to analyze the main formation of ancient weathering crust gas reservoirs in the middle and eastern Ordos Basin. Five31 reservoirs were subdivided and predicted to be prospective areas. It is considered that Shan 9-Shan 117 well and Shan 100 -Shaanxi 109 well are favorable reservoir development zones, Shaan 188-Shan 50 well and Dabao Dang area are favorable Reservoir development zone. Figure 2 Table 4 Senate 4 (Ma Zhenfang pick)