歧口凹陷区新近系馆陶组热储特征及成因机制OA北大核心CSTPCD
Characteristics and genetic mechanism of geothermal reservoirs in the Neogene Guantao Formation,Qikou Sag
渤海湾盆地黄骅坳陷歧口凹陷内赋存极为丰富的地热资源,其中新近系馆陶组热储最具开采价值,开展馆陶组热储地温场、孔渗条件、地热水循环规律和成因模式研究对认识馆陶组地热资源属性,合理开发地热资源具有重要意义.通过分析该区钻探、物探、测温、开发数据等资料,确定歧口凹陷内馆陶组热储为沉积盆地传导型地热系统,深部地幔热流和地壳内放射性生热以热传导方式传热,地热异常分布受基岩起伏的控制,在沧东断裂、滨海断裂附近出现高温地热异常,地温梯度可达 5.0℃/hm以上.馆陶组热储的孔渗条件南北两侧较高、中部较低,热储孔隙率整体在 26%以上,渗透率在 390×10-3 μm2 以上,单井涌水量平均 60 m3/h,是优质热储.地热水主要来源于古大气降水,由北部燕山补给,沿地层深循环,吸取岩石热量后形成地热水.歧口凹陷区馆陶组热储地热资源量为 41.81×1018 J,尤以天津滨海新区和河北黄骅市分布最广,占总资源量的 95%,资源与需求匹配度高,具有良好的开发利用前景.
The Qikou Sag in the Huanghua Depression,Bohai Bay Basin boasts extremely abundant geothermal re-sources.Among them,the geothermal reservoirs of the Neogene Guantao Formation have the greatest potential for ex-ploitation.To ascertain the properties of geothermal resources in this formation and rationally exploit these resources,it is significant to investigate the geothermal field,porosity,permeability,geothermal water circulation patterns,and genet-ic mode of geothermal reservoirs in the formation.Based on data from drilling,geophysical exploration,thermometry,and production of the study area,this study determined that the geothermal reservoirs of the Guantao Formation in the Qikou Sag constitute a conductive geothermal system of a sedimentary basin,with the heat flow from the deep mantle and the radioactive heat from the crust being transferred through heat conduction.The distribution of geothermal anom-alies is subjected to wavy bedrock.High-temperature geothermal anomalies with geothermal gradients up to above 5.0℃/hm are found near the Cangdong and Binhai faults.The geothermal reservoirs of the Guantao Formation manifest high porosity and permeability in the north and south but low porosity and permeability in the central portion,with porosity greater than 26% ,permeability above 390×10-3 μm2,and average single-well water yield of 60 m3/h overall.These suggest high-quality geothermal reservoirs.The geothermal water in the study area primarily originates from pa-leometeoric water.As the recharge source,the paleometeoric water from the Yanshan area in the north circulates deeply along strata while absorbing heat from the rock matrix,ultimately forming geothermal water.The geothermal reservoirs of the Guantao Formation in the Qikou Sag host geothermal resources of 41.81×1018 J,95% of which are distributed in the Tianjin Binhai New Area and Huanghua City,Hebei Province.Their high match with demands makes geothermal re-sources in the study area have great potential for production and utilization.
夏国朝;楼达;赵艳婷;王辉;段忠丰;孙晓林;张飞鹏;雒蓉;葛家成
中国石油大港油田公司,天津 300280天津地热勘查开发设计院,天津 300250中国石油大学(华东) 地球科学与技术学院,山东 青岛 266580
地球科学
歧口凹陷孔隙型热储馆陶组热储特征成因模式渤海湾盆地
Qikou Sagporous geothermal reservoirGuantao Formationgeothermal reservoir characteristicsgenetic modeBohai Bay Basin
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国家自然科学基金项目(42072130);中国石油天然气股份有限公司项目(2021DJ5501)
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