关键词: 深部地质封存技术, 三维地质建模, 深地模型, 鄂尔多斯盆地

Abstract: Deep geological storage is the most promising way of high brine and carbon dioxide geological storage. Based on the borehole database, combined with the terrain and geological data, the 3D geological modeling software Surpac is used to construct the 3D geological model for Dongsheng coal field in northeastern Ordos basin. The data of 8 deep wells with a depth greater than 2000m underground in the study area are collected in the model. A deep ground model covering the area of deep geological storage in northeastern Ordos basin was constructed. Based on the detailed analysis of the geometric characteristics of the strata distribution in the model, combined with the core test analysis results of the demonstration project, the occurrence forms, favorable characteristics and changing characteristics of the deep geological storage potential reservoir Liujiagou formationin the study area are summarized. The main conclusions are as follows: (1) In the study area, the formation thickness of the Liujiagou formation changes little, but in general, the southwest side of the Liujiagou formation is deeper and thicker than that of the northeast side, and the potential sealing space is larger，the scientific practice of deep geological sequestration can be actively carried out in this region; (2) The existence of arkose in Liujiagou formation provides micro-fracture space for storage, which is an important feature of the target layer for storage. According to the results of three-dimensional geological modeling, the overall thickness of Liujiagou formation in the study area is between 277m-460m, and the potential storage space can reach 2.79 million km3; (3) Due to the few number of demonstration projects, the model could provide a reference of the depth and thickness changes of Liujiagou formation in the region that lack drilling data under the background of a small amount of drilling data.