Temporal variability of vertical heat flux in the Makarov Basin during the ice camp observation in summer 2010

Based on hydrographic data obtained at an ice camp deployed in the Makarov Basin by the 4th Chinese Arctic Research Expedition in August of 2010, temporal variability of vertical heat flux in the upper ocean of the Makarov Basin is investigated together with its impacts on sea ice melt and evolution of heat content in the remnant of winter mixed layer （rWML）. The upper ocean of the Makarov Basin under sea ice is vertically stratified. Oceanic heat flux from mixed layer （ML） to ice evolves in three stages as a response to air temperature changes, fluctuating from 12.4 W/m2 to the maximum 43.6 W/m2. The heat transferred upward from ML can support （0.7＋0.3） cm/d ice melt rate on average, and daily variability of melt rate agrees well with the observed results. Downward heat flux from ML across the base of ML is much less, only 0.87 W/m2, due to enhanced stratification in the seasonal halocline under ML caused by sea ice melt, indicating that increasing solar heat entering summer ML is mainly used to melt sea ice, with a small proportion transferred downward and stored in the rWML. Heat flux from ML into rWML changes in two phases caused by abrupt air cooling with a day lag. Meanwhile, upward heat flux from Atlantic water （AW） across the base of rWML, even though obstructed by the cold halocline layer （CHL）, reaches 0.18 W/m2 on average with no obvious changing pattern and is also trapped by the rWML. Upward heat flux from deep AW is higher than generally supposed value near 0, as the existence of rWML enlarges the temperature gradient between surface water and CHL. Acting as a reservoir of heat transferred from both ML and AW, the increasing heat content of rWML can delay the onset of sea ice freezing.

Present Terrestrial Heat Flow Measurements of the Geothermal Fields in the Chagan Sag of the YingenEjinaqi Basin,Inner Mongolia,China

Owing to the lack o f terrestrial heat flow data, studying lithospheric thermal structure and geodynamics of the Yingen-Ejinaqi Basin in Inner Mongolia is limited. In this paper, the terrestrial heat flow o f the Chagan sag in the YingenEjinaqi Basin were calculated by 193 system steady-state temperature measurements of 4 wells, and newly measuring 62 rock thermal conductivity and 20 heat production rate data on basis o f the original 107 rock thermal conductivity and 70 heat production data. The results show that the average thermal conductivity and heat production rate are 2.11 ±0.28 W/(m.K) and2.42±0.25 nW/m^3 in the Lower Cretaceous o f the Chagan sag. The average geothermal gradient from the Lower Suhongtu 2 Formation to the Suhongtu 1 Fonnation is 37.6 °C/km, and that o f the Bayingebi 2 Formation is 27.4 °C/km. Meanwhile, the average terrestrial heat flow in the Chagan sag is 70.6 mW/m^2. On the above results, it is clear that there is an obvious negative correlation between the thermal conductivity o f the stratum and its geothermal gradient. Moreover, it reveals that there is a geothermal state between tectonically stable and active areas. This work may provide geothermal parameters for further research o f lithospheric thermal structure and geodynamics in the Chagan sag.

The Geothermal Regime in Sirt Basin, Libya: The Geological Role and Heat Flow Studies

Bottom hole temperatures (BHTs) and static formation temperatures (DSTs) of 70 deep exploratory wells are used to evaluate the geothermal regime in the northeastern part of Sirt Basin. A linear regression was derived between the BHT’s and the DST’s, for correcting the bottom hole temperatures from the drilling factors that lower them from the true formation temperatures. The geothermal gradients were calculated using the corrected BHT’s and the heat flow has been estimated. Interpretation of the geothermal data, utilizing subsurface maps and isothermal geologic cross section, revealed a shallow, local semi-thermal reservoir of Oligo-Miocene age (at depths 1000 m). The geothermal gradients and heat flow values of this reservoir are ranging from 40 - >60°C/Km and from 80 up to >130 mW/m2, respectively. At deeper depths (>1000 m until the maximum depth of investigation), the area has more or less moderate to low geothermal gradients that range from 40 to 2. The study indicates that the vertical and the lateral variations of the formation temperatures, geothermal gradients and the heat flow values are controlled by the structural, groundwater movements as well as lithological and thermal characteristics of the subsurface sequence.

HEAT FLOW AND ACCUMULATION OF OIL/GAS POOLS IN ORDOS BASIN,NW CHINA

This paper focuses on the heat flow field of Ordos Basin, NW China, by combin-ing experiment method of U, K and Th, heat generation, heat conductivity, etc. In the light of the comprehensive study of the experimental data and layer divisions of the crust, the average heat of Moho in Ordos Basin is 0. 37 HFU, much lower than that in North China Basin (0. 64-0. 97 HFU) or that in Songliao Basin (1.19 HFU) , NE China, showing the characteristics of the heat flow field of the stable cratonic basin. The average heat flow on the crust surface of the basin is about 1. 44 HFU, similar to that in Mesozoic diwa orogeny of the world, probably indicating that the diwa stage is soon expected in the basin. The interfaces from Moho to the surface in Ordos Basin have the same heat flow distribution-style with their high anomaly in theSE part, low anomaly in the NW part and NE-trending transition zone from Wuqi to Jingbian. In the transition zone, the geothermal dynamics plays the most important role for accumulation of petroleum. The top of the liquid window locates at the depth 1300m in the northwest, 1700m in the south, 1200m in the east of the basin.

Geothermal Gradient and Heat Flow in the Nigeria Sector of the Chad Basin, Nigeria

Information on geothermal gradient and heat flow within the subsurface is critical in the quest for geothermal energy exploration. In a bid to ascertain the thermal potential of Nigeria sector of the Chad Basin for energy generation, subsurface temperature information from 19 oil wells, 24 water boreholes drilled to depths beyond 100 metres and atmospheric temperature from the Chad basin were utilized in calculating geothermal gradient of the area. Selected ditch cuttings from the wells were subjected to thermal conductivity test using Thermal Conductivity Scanner (TCS) at the Polish Geological Institute Laboratory in Warsaw. The terrestrial heat flow was calculated according to the Fourier’s law as a simple product of the geothermal gradient and the mean thermal conductivity. Results obtained indicated geothermal gradient range of 2.81 °C/100 m to 5.88 °C/100 m with an average of 3.71 °C/100 m. The thermal conductivity values from the different representative samples range from 0.58 W/m*K to 4.207 W/m*K with an average of 1.626 W/m*K. The work presented a heat flow value ranging from 45 mW/m2 to about 90 mW/m2 in the Nigerian sector of the Chad Basin.

The annual mean sketches and climatological variability of the volume and heat transports through the inter-basin passages:A study based on 1 400-year spin up of MOM4p1

The annual mean volume and heat transport sketches through the inter-basin passages and transoceanic sections have been constructed based on 1400-year spin up results of the MOM4p 1. The spin up starts from a state of rest, driven by the monthly climatological mean force from the NOAAWorld Ocean Atlas （1994）. The volume transport sketch reveals the northward transport throughout the Pacific and southward transport at all latitudes in the Atlantic. The annual mean strength of the Pacific-Arctic-Atlantic through flow is 0.63x106 m3/s in the Bering Strait. The majority of the northward volume transport in the southern Pacific turns into the Indonesian through flow （ITF） and joins the Indian Ocean equatorial current, which subse- quently flows out southward from the Mozambique Channel, with its majority superimposed on the Ant- arctic Circumpolar Current （ACC）. This anti-cyclonic circulation around Australia has a strength of 11 x 106 ms /s according to the model-produced result. The atmospheric fresh water transport, known as P-E^R （pre- cipitation minus evaporation plus runoff）, constructs a complement to the horizontal volume transport of the ocean. The annual mean heat transport sketch exhibits a northward heat transport in the Atlantic and poleward heat transport in the global ocean. The surface heat flux acts as a complement to the horizontal heat transport of the ocean. The climatological volume transports describe the most important features through the inter-basin passages and in the associated basins, including： the positive P-E＋R in the Arctic substantially strengthening the East Greenland Current in summer; semiannual variability of the volume transport in the Drake Passage and the southern Atlantic-Indian Ocean passage; and annual transport vari- ability of the ITF intensifying in the boreal summer. The climatological heat transports show heat storage in July and heat deficit in January in the Arctic; heat storage in January and heat deficit in July in the Antarctic circumpolar current regime （ACCR）; and intensified heat transport of the iTF in July. The volume transport of the ITF is synchronous with the volume transport through the southern Indo-Pacific sections, but the year-long southward heat transport of the ITF is out of phase with the heat transport through the equatorial Pacific, which is northward before May and southward after May. This clarifies the majority of the ITF origi- natinR from the southern Pacific Ocean.

How Does Heat-Stress Intensity Affect the Stability of Microbial Activity and Diversity of Soil Microbial Communities in Outfields and Homefields’ Cultivation Practices in the Senegalese Groundnut Basin?

Agroecosystems in the Senegalese groundnut basin experience long periods of high temperatures and drought, which disrupt the stability of soil microbial communities. This study evaluated how that stability is affected by homefields and outfields’ agricultural practices and the duration of heat stress. Specifically, we collected soils from organically farmed fields that receive continual high inputs of manure (homefields), and from fields that are rarely manured (outfields). Soil samples were submitted to artificial heat stress at 60°C for 3, 14, and 28 days, followed by 28 days of recovery at 28°C. We examined the functional stability of microbial communities by quantifying C mineralization, and characterized the stability of the communities’ taxonomic compositions via high-throughput DNA sequencing. We found that the microbial communities have a low resistance to heat stress in soils from both types of fields. However, the manuring practice does affect how the functional stability of microbial communities responds to different durations of heat stress. Although functional stability was not recovered fully in either soil, microbial community resilience seemed to be greater in homefield soils. Differences in manuring practices also affected the structural taxonomic stability of microbial communities: relative abundances of Bacilli, Chloroflexia, Actinobacteria and Sordariomycetes increased in the homefield stressed-soils, but decreased significantly in outfield soils. In contrast, relative abundances of α-Proteobacteria, γ-Proteobacteria and Eurotiomycetes increased significantly in outfield stressed-soils, while decreasing significantly in the homefield soils. Relative abundances of Bacilli changed little in outfield soils, indicating that this taxon is resistant to heat stress. In summary, the microbial communities’ capacities to resist heat stress and recover from it depend upon the organic richness of the soil (i.e., manuring practice) and the adaptation of soil microbes to environmental conditions.

Determination of Curie Point Depth and Heat Flow Using Airborne Magnetic Data over the Kom-Ombo and Nuqra Basins, Southern Eastern Desert, Egypt

The Kom-Ombo and Nuqra basins in southern Egypt have recently been discovered as potential hydrocarbon basins. The lack of information about the geothermal gradient and heat flow in the study area gives importance to studying the heat flow and the geothermal gradient. Several studies were carried out to investigate the geothermal analyses of the northwestern desert, as well as the west and east of the Nile River, using density, compressive wave velocity, and bottom hole temperature (BHT) measured from deep oil wells. This research relies on spectral analysis of airborne magnetic survey data in the Kom-Ombo and Nuqra basins in order to estimate the geothermal gradient based on calculating the depth to the bottom of the magnetic source that caused the occurrence of these magnetic deviations. This depth is equal to the CPD, at which the material loses its magnetic polarisation. This method is fast and gives satisfactory results. Usually, it can be applied as a reconnaissance technique for geothermal exploration targets due to the abundance of magnetic data. The depth of the top (Zt) and centroid (Z0) of the magnetic source bodies was calculated for the 32 windows representing the study area using spectral analysis of airborne magnetic data. The curie-isotherm depth, geothermal gradient, and heat flow maps were constructed for the study area. The results showed that the CPD in the study area ranges from 13 km to 20 km. The heat flow map values range from 69 to 109 mW/m2, with an average of about 80 mW/m2. The calculated heat flow values in the assigned areas (A, B, C, and D) of the study area are considered to have high heat flow values, reaching 109 mW/m2. On the other hand, the heat flow values in the other parts range from 70 to 85 mW/m2. Since heat flow plays an essential role in the maturation of organic matter, it is recommended that hydrocarbon accumulations be located in places with high heat flow values, while deep drilling of hydrocarbon wells is recommended in places with low to moderate heat flow values.

Observational analysis of the double-diffusive convection in the deep Canada Basin

The Canada Basin （CB） is the largest sub-basin in the Arctic, with the deepest abyssal plain of 3 850 m. The double-diffusive process is the possible passage through which the geothermal energy affects the above isolated deep waters. With the temperature-salinity-pressure observations in 2003, 500-m-thick transition layers and lower 1 000-m-thick bottom homogenous layers were found below 2 400 m in the central deep CB. Staircases with downward-increasing temperature and salinity are prominent in the transition layers, suggesting the double- diffusive convection in deep CB. The interface of the stairs is about 10 m thick with 0.001-0.002℃ temperature difference, while the thicknesses of the homogenous layers in the steps decrease upward from about 60 to 20 m. The density ratio in the deep central CB is generally smaller than 2, indicating stronger double-diffusive convection than that in the upper ocean of 200-400 m. The heat flux through the deepest staircases in the deep CB varies between 0.014 and 0.031 W/m2, which is one-two orders smaller than the upper double-diffusive heat flux, but comparable to the estimates of geothermal heat flux.

塔河油田下寒武统烃源岩生排烃史差异演化及成藏效应

针对塔河奥陶系油藏多相态油气富集主控因素认识不清的问题,采用盆地模拟技术再现了塔河油田下寒武统烃源岩热演化史、生烃史及典型剖面油气运聚过程。研究表明:塔河地区下寒武统烃源岩从加里东早期进入成熟阶段,目前处于高成熟—湿气阶段,发育断续埋藏、持续埋藏和长期浅埋藏3种热演化模式,分别对应油气并举双峰型、油强气弱型、单峰型3种生烃模式。烃源岩热演化差异致使奥陶系油气发育多期充注、垂向疏导、侧向调整改造的演化历史,油气相态呈现轻质油藏—中质油藏—重质油藏的有序分布格局。塔河地区不同构造带下寒武统烃源岩热演化具有由北西向南东递增的趋势,与油气相态差异呈现明显的正相关性,体现出“源控”特征,喜山期控制了现今油气藏分布。研究发现,塔河油田盐下、托甫台生烃强度高,喜山期生烃总量相对较大,可作为下一步勘探开发的有利区。研究结果对塔河油田深层油气资源和目标评价有一定指导意义。

Simulation experiment on hydrocarbon generating potential of various source rocks on the northern margin of the Qaidam Basin,Qinghai,China

The northern margin of the Qaidam Basin is one of the main oil-gas exploration areas in western China,where source rocks are composed mostly of Middle and Lower Jurassic dark mud shale,carbargillite and coal. A large number of subsurface and outcrop samples differing in lithology with different types of organic matter were selected for resource evaluation,research and calculation. And among them,13 samples were used for simulation experiment on hydrocarbon generating potential of various source rocks. At first,two kinds of heating modes were compared through simulation experiment,including single temperature-step heating and continual heating. Perhaps,the process of hydrocarbon generation and expulsion occurred naturally between a close system and an open system. In addition,the first heating mode was convenient,and all its reaction products were involved in the whole thermal evolution,and the final simulation experimental results were basically in consistency with the natural evolution trend. Therefore,the first heating mode was adopted and the hydrocarbon yield of every sample was worked out. Accord-ing to the type and lithology of organic matter and the hydrocarbon yield of samples for simulation experiment,hy-drocarbon generation and expulsion mode with three kinds of lithology and five types of source rock has been estab-lished to provide the basis for hydrocarbon generation evaluation,research and resource calculation.

Thermal structure about southwest sub-basin of South China Sea

There are some factors, such as the topographic relief, sedimentary thickness and thermal conductivity, magmatic activity and thermal cooling, influencing the seafloor heat flow and the evolution of lithosphere structure in southwest sub-basin （SWSB）, South China Sea. On the base of the geological structure characteristic of SWSB this paper will discuss some other factors including thermal anomaly area, dike produced by magma intrusion and lithosphere relief, by modeling and calculating. Calculating results indicate partial areas where temperature is higher than vicinity in the lithosphere, which we call thermal anomaly here containing thermal anomaly area and dike in this paper, could decrease heat flow below, increase above, and gradually increase to two sides; heat flow in upwelling parts of lithosphere is usually higher than sinking parts, and in the middle is of a gradual transition.

2022年8月四川盆地持续性极端高温特征及不同模式预报误差分析

本文基于2022年8月四川盆地104站逐时温度、降水数据和1971—2021年历史同期数据,及EC、CMA-GFS、CMA-MESO模式的2 m气温预报等数据,运用统计学相关方法分析了此次极端高温过程的特征及预报误差。结果表明:①2022年8月四川盆地极端高温过程范围大、强度强、持续时间长,有87.5%站最高气温超过该站历史同期极值,且高温最强盛时段较历史同期明显推后。②2022年8月最高气温分布为东高西低,最高气温与历史同期极值差分布则相反,其中最高气温随站点海拔增大而减小,而极值差则随站点海拔先增大再减小。另外,受热岛效应影响,极值差大值站点主要集中在龙泉山脉附近。③高温期间,最高、最低气温平均值高、距平大,且累计降水量和雨日数也明显低于历史同期。④相较而言,EC模式的预报优势主要在盆地低海拔地区。而CMA-MESO模式在盆地周边陡峭地形区域的平均绝对误差则更小。另外,EC模式预报的最高气温峰值出现时间更接近于实况,而CMA-MESO模式预报高温持续日数更接近实况。

单季稻开花结实期高温热害特征及防控对策

近年,长江流域稻区单季稻开花结实期高温频发重发。本文分析了高温年水稻开花结实期高温热害特征及高温对结实率的影响。高温年日最高温度高,持续时间延长;高温年7月上旬至8月上旬日最高温度较常温年高4.3℃~4.8℃;水稻开花结实期遇到高温热害结实率下降28.2~43.4个百分点;品种间耐高温热害特性差异较大。根据开花结实期高温热害特征及高温引起结实率下降的特点,提出高温预警及播期调整、耐热品种选择、高温期间田间灌水、喷施生长调节物质等开花结实期高温热害防控对策。

A research on the geothermal structure in Yanqing-Huailai Basin and its neighbouring region

ＡｒｅｓｅａｒｃｈｏｎｔｈｅｇｅｏｔｈｅｒｍａｌｓｔｒｕｃｔｕｒｅｉｎＹａｎｑｉｎｇ┐ＨｕａｉｌａｉＢａｓｉｎａｎｄｉｔｓｎｅｉｇｈｂｏｕｒｉｎｇｒｅｇｉｏｎＪＩＮ－ＨＵＡＺＵ（祖金华）ＱＩＡＮ－ＦＡＮＷＵ（吴乾蕃）ＹＵ－ＦＡＮＧＬＩＡＮ（廉雨方）...

泥河湾盆地火山角砾岩原料的热处理实验

泥河湾盆地内发现了众多以精致楔形细石核为特色的细石器遗址。在以往的研究中,研究者对此类石制品组合进行了技术、类型等方面的研究,但其石料来源、石料是否经过热处理等问题仍未得到妥善解决。本文开展了盆地内旧石器时代晚期晚段常用原料火山角砾岩的调查和热处理实验研究。研究表明,泥河湾盆地六棱山基岩中的火山角砾岩,直接使用时,难以满足楔形细石核压制剥片对原料品质的要求;经过600°C的热处理后,其抗力性降低、延展性提高,剥片性能显著提高,可很好地进行楔形细石核的系统压制剥片。基于实验观察,同时借鉴其他学者的研究成果,本文对下卜庄遗址的相关材料进行了初步分析,发现了石料热处理行为的线索。对泥河湾盆地旧石器时代晚期遗址开展系统的石料热处理研究,有望揭示盆地内古人类对石料热处理的复杂行为。

四川盆地一次暴雨过程中的穿透性对流形成机理分析

2019年8月18~22日,高原东侧到四川盆地西部发生的一次暴雨过程,其与穿透性对流的发生发展密切相关。为揭示此次穿透性对流的形成机理和过程,本文利用欧洲中心再分析资料ERA5以及高分辨数值模式(WRF)的模拟结果进行了分析。结果表明,此次穿透性对流过程发生在中国沿海地区大范围对流层顶折叠导致盆地以东的上空出现平流层位涡(PV)下传的特殊天气背景下。穿透性对流的形成主要分为三个阶段:(1)中低层对流的触发。由于大陆高压西伸,四川盆地附近气压梯度加强引起低空急流发展,在其左侧产生气旋性切变,同时引起与高原东南侧大地形正交的抬升气流分量增强。地形动力抬升叠加气流辐合抬升在不稳定层结下触发对流。(2)对流层高层上升运动发展。这主要与湍流扩散导致的平流层持续下传的PV气团在非绝热加热作用下的发展有关。盆地西侧对流发展引起的非绝热加热作用导致高层净增温垂直梯度增强,进而导致了高层局地正PV的加强。高层东风气流背景下,正PV异常的右侧为上升运动,使得300 hPa以上至下平流层上升运动的发展增强。(3)盆地附近的高中低层上升运动垂直耦合叠加,形成穿透性对流。中尺度对流系统层状模态的发展以及干燥环境下水汽的蒸发冷却导致300 hPa至600 hPa出现下沉运动。下沉运动造成的局地干冷侵入,既加强了上空“下湿上干”的不稳定层结,也加强了中低层的气流辐合,导致原中层300~600 hPa附近的下沉运动转为上升运动。低层由于正涡度倾斜发展,上升运动得以维持。由此,四川盆地上空的上升运动出现整层的垂直叠加耦合,表现为从对流层低层到平流层底的一致性上升运动,穿透性对流形成,导致后期降水增强。

淮河流域暖季极端高温干旱复合事件的演变特征及其与气候和植被的关系

使用淮河流域1981年至2020年的149个气象站点的气温和相对湿度数据,分析了流域暖季极端高温干旱复合事件(Compound Drought and Heat Events,CDHEs)的时空演变特征,并通过趋势分析和相关分析法探讨了CDHEs与气候和植被的关系。结果表明:(1)CDHEs的发生日数在年代际尺度上呈现明显的增加趋势,并且范围扩大,频发区逐渐向淮河流域中西部移动;(2)在年际尺度上,CDHEs随时间序列呈显著的波动上升趋势,空间分布上以西北部为中心向四周递减。连续CDHEs事件呈年际变化,最大2至4天的连续事件存在波动,2019年达到高峰,并且在流域内零散或成片出现;(3)在月际尺度上,CDHEs的发生日数在6月最多,其次是5月、7月、9月和8月。淮河流域入汛前的旱情和入汛后的旱涝急转都容易导致CDHEs发生,而且随着月际变化向南移动;(4)CDHEs对水热条件和大气环流具有特别的敏感性。在850hPa反气旋和500hPa显著高压异常的控制下,高温、低湿、高蒸发和降水少的气候背景有利于淮河地区CDHEs的形成,尤其是在淮河中西部地区。因此,CDHEs的发生与气候变化密切相关;(5)CDHEs与植被生长也存在显著关系。CDHEs与GPP呈显著的负相关,而与NDVI呈显著的正相关,显著地区的土地类型以耕地和城乡、工矿、居民用地为主。GPP和NDVI的不同步可能是因为多种因素的非线性相互作用,而不仅仅是单一因素的影响。此外,对于GPP和NDVI来说,土壤含水量至关重要。总之,本文对淮河流域CDHEs的时空分布特征进行了深入研究,并探讨了其与气候和植被的关系。研究结果可以为该地区的气象灾害防御和生态环境保护提供科学依据和参考。

基于熵权法-TOPSIS-灰色关联法的储层综合评价:以莺歌海盆地黄流组为例

莺歌海盆地上中新统黄流组是高温高压系统,地层地温梯度超过4℃/100 m、压力系数大于1.6。地热资源潜力丰富,但地热资源评价的相关工作还未开展。通过9口钻井、测井录井、生产资料以及最新7口井地层测温数据和岩石热物性参数测试,在储层储集性能基础上,结合热物性参数,开展储层综合评价工作。以黄流组为例,在储层六参数关系评价基础上,优选孔隙度(Ф)、渗透率(K)、泥质含量(Vsh)、地层系数(DФ)、地层温度(T)、生热率(A)、热导率(J)7个热储评价指标,采用熵权-TOPSIS-灰色关联方法,对该类型热储进行综合评价。研究认为:7个评价指标中,孔隙度、渗透率、地层系数的权重占比较大,分别为21.31%,21.07%和20.42%,是主要影响因素。考虑评价参数的正负理想解的欧氏距离和各指标与正负理想解的灰色关联度,开展不同决策偏好情况下的相对贴近度角度来定量评价,结果显示,储层H1-2、H1-1、H2-2相对贴近度较高,分别为0.624,0.606,0.529,储层性质较好,可作为莺歌海盆地黄流组热储层的重点研究对象。

安徽省阜阳盆地及周边大地热流分布特征

阜阳盆地位于周口坳陷的东部,地热资源丰富,但基础地热地质研究相对较少,尤其对区内大地热流研究尚属空白。为深入研究本区地热资源,为地热资源潜力评价提供数据支持和科学依据,本文基于收集的6口钻孔测温资料、实测的4口稳态测温数据以及61块岩心样品热导率测试数据,计算出了4个大地热流值。研究结果表明:研究区0~2281 m内现今地温梯度为23.4℃/km~35.5℃/km,平均值为27.9℃/km;热导率介于0.968~4.932 W/(m·K)之间,平均值为1.959 W/(m·K);对应的大地热流值介于44.7~63.8 mW/m^(2)之间,平均值为53.4 mW/m^(2),与周口坳陷已发布的各大地热流平均值53.4 mW/m^(2)一致,但却较明显低于中国大陆地区(平均值60.4 mW/m^(2))、中国东部(平均值61.9 mW/m^(2))、研究区东部两淮煤田(平均值58.3 mW/m^(2))以及南部秦岭造山带(平均值61.4 mW/m^(2)),并发现与四川盆地、柴达木盆地等国内主要的克拉通型盆地较接近,同时远远低于汾渭地堑、渤海湾盆地等新生代构造活跃的裂谷型盆地,反映出区域构造处于稳定状态;同时,区内热流之间有一定的差异,主要是受区域地质构造背景、基底起伏、沉积盖层、断裂活动等影响。