渤海湾盆地南堡凹陷X平台馆陶组热储潜力评价

伴随能源结构调整及“双碳”目标的推进,地热资源的勘探开发逐渐成为热点。通过地质资料整理、地温梯度计算、热储厚度解释、水质分析及采灌数值模拟等方法,探讨了渤海湾盆地南堡凹陷X平台馆陶组地热地质条件,明确了地热资源潜力。研究表明,研究区馆陶组热储岩性以砂岩为主,砂地比介于36.5～54.9%之间;层顶界埋深在2160m～2340m之间,底界埋深在2880m～2996m之间,热储层有效厚度在223.4m～349.6m;热储层孔隙度介于11.4%～39.0%之间,渗透率平均为348.8×10-3μm2;地层温度介于80.8℃～95.6℃。热储资源量为10.683×1018J,折合标准煤约3.65亿吨;在流量为120m3/h的采灌平衡的条件下,得出地热水开采稳产30年的采灌井合理间距为400m。研究结果为我国含油气盆地的中深层水热型地热资源勘探开采提供了有效借鉴。

Evaluation of heat storage potential of the X-platform Guantao Formation in the Nanpu sag in the Bohai Bay Basin

With the adjustment of energy structure and the promotion of dual carbon goals, the exploration and development of geothermal resources has gradually become a hot spot. Through geological data collation, geothermal gradient calculation, heat storage thickness interpretation, hydrogeochemical testing and numerical simulation of irrigation and harvesting, the geothermal geological conditions of the X-platform pavilion of the Nanpu sag in the Bohai Bay Basin were discussed, and the potential of geothermal resources was clarified. The results show that the hot storage lithology of the Guantao Formation in the study area is mainly sand-conglomerate, and the sand-to-ground ratio is between 36.5~54.9%. The burial depth of the top boundary is between 2160m~2340m, the buried depth of the bottom boundary is between 2880m~2996m, the effective thickness of the thermal reservoir is 223.4m~349.6m, the porosity of the thermal reservoir is between 11.4%~39.0%, and the average permeability is 348.8×10-3μm2. The formation temperature is between 80.8 °C ~ 95.6 °C. The thermal storage resources are 10.683×1018J, equivalent to about 365 million tons of standard coal. Under the condition that the production and irrigation ratio of geothermal wells is 100% and the mining flow rate is 120 m3/h, it is concluded that the reasonable spacing of the production and irrigation wells with stable production for 30 years of geothermal water exploitation is 400m. It provides an effective reference for the exploration and development of medium and deep hydrothermal geothermal resources in oil-bearing basins in China.