摘要
济阳坳陷蕴藏着丰富的地热资源,开展深层干热岩的系统评价对于坳陷地热资源综合利用具有重要意义.本文利用收集的1∶20万重力数据38870 km2、1∶5万航磁数据26630 km2和胜利油田以往实施的钻井、地震勘探资料,采用Parker-Oldenburg反演迭代算法、重力-地震联合剥层方法、重磁正反演等方法,开展莫霍面、居里面、壳断裂-岩石圈断裂、基底构造和基底岩性等地热地球物理研究.通过实施大地电磁测深剖面116 km,验证了壳幔过渡带熔融体发育特征.从居里面深度、莫霍面深度、地温梯度、热储层岩性、盖层厚度、潜山规模6个方面评价优选了5处干热岩靶区.济阳坳陷具"壳幔生热、构造控热、潜山储热、盖层保温"四位一体地热成因特征,是以"传导型干热-水热共存、对流型水热补充"为主要特征的盆地复合型地热系统,潜山型干热岩靶区具有进一步勘探和开发的前景.
Abstract
The Jiyang Depression is known for its abundant geothermal resources,and a systematic evaluation of deep dry hot rocks is crucial for the comprehensive utilization of geothermal resources in the depression.This study utilizes a comprehensive dataset,including 1∶200000 gravity data covering an area of 38870 km2,1∶50000 aeromagnetic data covering 26630 km2,drilling data and seismic exploration data conducted by Shengli Oilfield Company.Various advanced techniques,such as the Parker-Oldenburg inversion iteration algorithm,gravity seismic joint layer stripping method,and gravity magnetic forward and backward modeling,are applied to perform geothermal geophysical research on key parameters including the Moho surface,Curie surface,crustal fault lithospheric fault,basement structure,and basement lithology.To verify the development characteristics of molten bodies in the crust-mantle transition zone,a 116 km magnetotelluric sounding profile is implemented.Based on comprehensive analysis,five promising dry hot rock targets are identified and evaluated from six perspectives:the depth of the Curie surface,the depth of the Moho surface,the geothermal gradient,the lithology of the thermal reservoir,the thickness of the cap rock,and the scale of the buried hill.The geothermal system in the Jiyang Depression exhibits a four in one geothermal genesis feature,namely"crust mantle heat generation,structural heat control,buried hill heat storage,and cover layer insulation".It is primarily a basin composite geothermal system characterized by a combination of conduction-type dry heat water and convection-type water heat supplement.The findings of this study present significant opportunities for further exploration and development of the buried hill-type dry hot rock targets in the Jiyang Depression,confirming their potential for geothermal energy extraction and utilization.
基金项目
山东省自然科学基金青年项目(ZR2022QD060)
胜利油田分公司科研项目(P22090)
NETL
NSTL
维普
万方数据