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鄂尔多斯盆地塔巴庙区块中下石盒子组气藏自投入开发以来,而区块内气井产量也随着开发时间的增加而出现了不同程度的递减。塔巴庙下石盒子组的地层温度普遍接近90℃,且其埋深不超过3 000 m,岩层内的地热能属于中低温地热资源。目前,体积法是沉积型热储中普遍使用的一种地热资源评价法。采用下石盒子组中岩芯矿物组成资料和矿物比热容数据,依据Voigt和Reuss提出的算术平均模型计算出下石盒子组中盒1段、盒2段与盒3段的岩石骨架体积比热容值。采用体积法,由岩石骨架和孔隙流体的体积比热容、岩石孔隙度、流体饱和度以及地层温度与当地年均温的差值这五项评价参数计算出下石盒子组中的地热资源量。
Since the middle and lower Shihezi gas reservoirs in the Taba temple block of Ordos Basin have been put into development, the gas well production in the blocks has also decreased in varying degrees with the increase of development time. The formation temperature of the Lower Shihezi Formation in Taba Temple generally approaches 90 ℃ and its buried depth does not exceed 3 000 m. The geothermal energy in the rock formation belongs to medium- and low-temperature geothermal resources. At present, the volume method is commonly used in sedimentary heat storage geothermal resources assessment method. Based on the data of core mineral composition and mineral specific heat capacity in the lower lithosphere subgroup, the volumetric specific heat capacity of the rock framework in the first, second and third boxes of the lower lithosphere subgroup was calculated according to the arithmetical mean model proposed by Voigt and Reuss. Volumetric method is used to calculate the amount of geothermal resources in Xiashihezi Formation from the five evaluation parameters of volumetric specific heat capacity, rock porosity, fluid saturation and difference between local temperature and local average temperature of rock skeleton and pore fluid.