用离散单元划分法计算页岩气资源量

A discrete element method for shale gas resource estimation

针对页岩气聚集机理的特殊性和我国页岩气评价的基础条件,提出了采用离散单元划分法计算页岩气资源量。根据页岩含气量的非均质性特点,借鉴有限元原理,将评价地质单元中连续分布的页岩气资源进行有限数目的单元离散;根据页岩气不具有顺层流动性的特点,以含气量资料井为中心,采用井控分块、单元划分、参数类比、离散累加的原则和方法计算页岩气资源量。该方法应用在鄂尔多斯盆地下寺湾区页岩气资源量计算中,效果良好,表明离散单元划分法可应用于页岩气勘探开发各阶段,在页岩气滚动评价中具有较大的推广应用前景。

Based on the present exploration and development of shale gas in China,a discrete element method was proposed to investigate the accumulation mechanism and characteristics of shale gas.The gas content in shale is heterogeneous,resulting in that shale gas can not flowing along the shale reservoir bed.The proposed method divides the continuously distributed shale gas resoueces into a limited number of discrete elements.A principle of＂well controlling element,discrete element division,parameter analog and discrete cumulative＂is adopted,which is well consistent with the results of reliable gas content data as estimating center.The method was applied in the Ordos basin Xiasiwan area and showed a good practical effect,indicating that this method can be applied at various stages in the exploration and development of shale gas and demonstrates a large application prospects.