济阳坳陷深层地热资源研究进展与下步展望

Research progress and prospects of deep geothermal resources in Jiyang Depression

济阳坳陷地热资源分布范围广、资源潜力大,是胜利油区未来地热资源开发利用的重要方向。为科学、高效地开发利用济阳坳陷地热资源,系统梳理了关于济阳坳陷水热型和干热岩型地热资源的热储层、热盖层、热源等地热地质条件,分别计算了2类地热资源的资源量,揭示其地热资源潜力。研究结果表明,济阳坳陷水热型地热资源主要赋存在馆陶组、东营组及下古生界等,其中馆陶组为水热型地热资源潜力最大的层系,分布广、资源量大,是下步重点勘探开发利用层系。济阳坳陷属于“冷壳热幔型”沉积盆地,具有较高的大地热流值,干热岩型地热资源热储层主要为太古宇的岩浆岩和变质岩,深部地幔热流是其主要热源,热储层分布面积大,温度均较高,其资源丰度为渤海湾盆地中最高。济阳坳陷地热资源丰富,为加快其开发利用步伐,建议水热型地热资源要加强地热资源与油气的关系及资源分区评价2项关键工作;干热岩型地热资源的勘探开发仍处于起步探索阶段,今后需要重点加强其热储层类型的选择与热源机制2个方面的研究。

Geothermal resources are widely distributed in Jiyang Depression,with great potential.They would be essential direc‐tions for the development and utilization of geothermal resources of Shengli Oilfield in the future.The geothermal geological condi‐tions were systematically sorted out,such as thermal reservoir,thermal cover,and heat source of hydrothermal geothermal re‐sources and geothermal resources of dry-hot rocks in Jiyang Depression,and the amounts of two types of geothermal resources were calculated respectively to reveal their geothermal resource potential to develop and utilize geothermal resources in Jiyang De‐pression scientifically and efficiently,.The results show that hydrothermal geothermal resources in Jiyang Depression are mainly de‐posited in the Guantao Formation,Dongying Formation,and Lower Paleozoic strata.Among them,Guantao Formation is the strata with the largest potential for hydrothermal geothermal resources,featuring a wide distribution and massive resources.It is the criti‐cal stratum for exploration and utilization in the next step.Jiyang Depression is a sedimentary basin with a cold crust and hot mantle and has a high geothermal flow value.The thermal reservoirs in the geothermal resources of dry-hot rocks are mainly magmatic rocks and metamorphic rocks of the Archean.The heat flow in the deep mantle is the main heat source.The distribution area of ther‐mal reservoirs is large and has high temperatures,and the resources are primarily distributed in Bohai Bay Basin.Geothermal re‐sources are rich in Jiyang Depression.It is suggested that the relationship between hydrothermal geothermal resources and oil and gas,as well as the evaluation of resource zoning,should be strengthened to accelerate the development and utilization of geother‐mal resources.The exploration and development of geothermal resources of dry-hot rock is still in the initial stage.Research on the selection of thermal reservoir types and heat source mechanisms should be strengthened in the future.