Paleo-environment and reservoir evolution of the Middle Ordovician Kelimoli Formation in the northern Tianhuan area,Ordos Basin,China: implications for high-quality reservoir development     

S. W. Mao  J. M. Li  W. Liu  Z. C. Wang  Z. L. Huang 《Australian Journal of Earth Sciences》2018,65(4):535-555

The Middle Ordovician Kelimoli Formation carbonate reservoirs in the northern Tianhuan area, Ordos Basin, China are main exploration targets. Subsurface core samples, logging, drilling and production data from the area were used to characterise the carbonate reservoir and to construct a genetic model for exploration. The sedimentary facies identified include trough–continental rise, upper–lower slope, platform margin reef-shoal, open platform and evaporation-restricted platform. The slope and platform margin facies are potential zones for high-quality reservoirs. Porosity in the study area comprises intergrain, intercrystal, intragrain and intracrystal pores, fractures and vughs. The Sr/Ba (0.40–4.87) and V/(V + Ni) (0.64–0.97) ratios indicate deposition in a brackish water-dominated environment under reducing conditions, associated with sea-level fluctuations during the deposition of the Kelimoli Formation. The Sr/Ba, V/(V + Ni), ⁸⁷Sr/⁸⁶Sr ratios, δ¹⁸O values and crystal texture of dolomite samples suggest that meteoric water was involved in the diagenetic fluid in the near-surface depositional environment. Isotopes (δ¹³C and δ¹⁸O) and trace elements (Fe and Mn) allowed the identification of seepage-reflux and mixed-water dolomitisation. The crystal textures of the samples consist of micritic, bioclastic and reefal limestones, and dolomite with gypsum, which were easily dissolved during the early diagenetic stage. The epidiagenetic stage was the key period for the development of high-quality reservoirs because of large-scale bedding-parallel karstification from meteoric water. The reservoir zones, dominated by partially filled and unfilled vughs, and fractures, are favourable exploration targets in the northern Tianhuan area.  相似文献   

Progress in the Application of Ground Gravity Observation Data in Earthquake Prediction     

Jinglun Mao  Yiqing Zhu 《地球科学进展》2018,33(3):236-247

The mechanism of earthquake inoculation and the process of earthquake occurrence are very complicated. Additionally, earthquakes do not happen very often, and we lack enough cognition to the earth’s interior structure, activity regularity and other key elements. As a result, research progress about the theory of earthquake precursors has been greatly restricted. Ground gravity observation has become one of the main ways to study earthquake precursor information in many countries and regions. This paper briefly summarized the surface gravity observation technology and observation network in China: the surface gravity measurement instrument developed from Huygens physical pendulum in seventeenth Century to today’s high-precision absolute gravimeter, and its accuracy reached to ±1×10^-8 m/s². China has successively established the National Gravity Network, Digital Earthquake Observation Network of China,the Crustal Movement Observation Network of China Ⅰ and the Crustal Movement Observation Network of China, to provide a public platform for monitoring non tidal gravity change, seismic gravity and tectonic movement. The use of specific examples illustrated the role of gravity observation data in earthquake prediction. The gravity observation data of ground gravity can be used to capture the information of gravity change in the process of strong earthquake inoculation, and to provide an important basis for the long-term prediction of strong earthquakes. The temporal and spatial variation characteristics of the regional gravity field and its relation to strong earthquakes were analyzed: Before the earthquake whose magnitude is higher than M_S 5, generally there will be a large amplitude and range of gravity anomaly zones. Strong earthquakes occur mainly in areas where the gravity field changes violently. The dynamic change images of gravity field can clearly reflect the precursory information of large earthquakes during the inoculation and occurrence. Finally, the existing problems of surface gravity technology in earthquake precursor observation were put forward and the use of gravity measurement data in earthquake prediction research was prospected.  相似文献   

一种新的岩浆岩分类定量方法     

丁卫平  司玉庆  毛学超 《江苏地质》2023,47(1):30-43

目前,岩浆岩的超基性、基性、中性、酸性的分类均根据SiO2的含量,但这种单一含量判别标准并不严谨,含量经常与分类不完全对应。使用TraceElem 1.0软件对各种岩浆岩进行逐步判别分析、聚类分析和对应分析研究,据此认为超基性岩由MgO和FeO组成的因子确定,基性岩则由P2O5、Fe2O3、TiO2、CaO、MnO组成的因子确定,中性岩由Na2O和Al2O3组成的因子确定,酸性岩由K2O和SiO2组成的因子确定。岩浆岩的分类宜以SiO2为主、以MgO和CaO为辅,尤其要引入MgO。在SiO2含量相同的情况下,MgO、CaO含量越高,基性程度越强。基于这一分析结果,提出一种新的酸度指数（ADI)计算方法,即ADI=w(SiO2)-0.75w(MgO)-0.23w(CaO),ADI<38.0%为超基性岩,在38.0%～52.0%之间为基性岩,在52.0%～62.5%之间为中性岩,>62.5%为酸性岩。  相似文献   

沧县隆起北部地区地热资源特征及开发潜力          下载免费PDF全文

王婷灏  汪新伟  毛翔  罗璐  高楠安  刘慧盈  吴陈冰洁 《中国地质》2022,49(6):1747-1764

【研究目的】地热资源特征研究及开发潜力分析是开发区域地热资源的重要依据。【研究方法】本文将前人研究成果与最新钻井资料相结合,通过对沧县隆起北部地区地热地质背景、热储分布、地温场特征、水化学资源类型等主要因素进行剖析,建立了该区的地热成藏模式。【研究结果】沧县隆起北部地区是在渤海湾伸展型沉积盆地高大地热流值背景下,由北部燕山裸露区基岩接受的大气降水作为近源补给水源,进入基岩的冷水在深层循环过程中受到深部热源加热增温,沿断裂破碎带和不整合面向上运移富集,形成的以传导型传热机制为主的地热系统。【结论】本区地热资源特点为热储类型多、盖层地温梯度高、补给速度快、资源量巨大。主要表现为：区内分布馆陶组砂岩热储,奥陶系、蓟县系雾迷山组岩溶热储三套主力热水储集层;地温场分布主要受基底构造形态控制,基岩凸起区的平均地温梯度为45℃/km;地下水类型随着埋深的增加由HCO₃-Na、HCO₃·SO₄-Na型水向成熟的Cl-Na型水过渡;本区内三套热储的可采地热资源量为1.67×10¹⁰GJ,折合标煤5.72×10⁸t,年可开采地热资源量可满足供暖面积2亿m²,若在采灌平衡的条件下,沧县隆起北部地区年可采地热资源量为7.06×10⁷GJ,折合标煤2.41×10⁶t,可满足供暖面积0.85亿m²,具有良好的地热市场开发前景。  相似文献   

基于扩展有限元分析的页岩水力压裂裂缝扩展规律探究          下载免费PDF全文

温继伟  项天  朱茂  胡萍  毛建设  荆羽慧 《探矿工程》2022,49(5):177-188

水力压裂是开采地下页岩气资源的有效技术手段,探究页岩水力压裂裂缝的扩展规律,可为页岩气的高效开采提供科学的指导依据。通过运用大型有限元软件ABAQUS中的扩展有限元模块,针对不同地应力差工况条件下均质页岩中初始裂缝的位置、方位角、数量和含层理页岩中层理的构造方向、内部倾角、岩性对水力裂缝扩展的影响进行探究。结果表明：对于垂向扩展的水力裂缝,水平主应力增大使裂缝更不易扩展,裂缝扩展长度减小、起裂压力增大;在注液体积流量相同时,向初始裂缝两端同时起裂所形成的水力裂缝长度大于仅向一侧起裂;当初始裂缝处于页岩中部且呈45°方向时,裂缝会向最大水平主应力方向偏转,且偏转程度随最大水平主应力的增大而增大;分时多簇压裂时,裂缝间的扩展会相互干扰,且会较大地影响裂缝扩展的形态和起裂压力,但对裂缝注液点裂缝宽度的影响较小;对于含水平和竖直构造层理的页岩,改变层理内部倾角,水力裂缝会出现不同程度偏转,且其偏转程度随着层理内部倾角的增大而减小;对于含45°方向构造层理的页岩,水力裂缝在层理分别为砂岩、煤岩和泥岩中的偏转程度依次增大,且裂缝偏移比随着最大水平主应力的增大而增大。  相似文献   

济南四大泉群水化学特征及其成因分析     

毛玉洁 《地质与勘探》2022,58(5):1042-1056

为明晰济南四大泉群水化学动态变化特征及成因,利用离子比例系数、PHREEQC模拟以及氢氧同位素反演等方法分析各泉群水化学成分特征及其形成过程。研究表明：（1）四大泉群阳离子Ca2+为优势离子,阴离子HCO3-为优势离子;（2）潭西泉和珍珠泉水化学类型稳定,而趵突泉和黑虎泉由HCO3—Ca型变为HCO3·SO4—Ca型;（3）四大泉群受地表水、寒武系凤山组-奥陶系岩溶水以及寒武系张夏组岩溶水混合补给,其中趵突泉、黑虎泉接受寒武系凤山组-奥陶系岩溶水补给占比略大,而潭西泉、珍珠泉接受寒武系张夏组岩溶水补给占比略大;黑虎泉滞留时间最短,循环交替强烈;（4）水岩相互作用强弱程度导致泉群水化学成分差异,溶解沉淀作用强度整体大于阳离子交换作用。趵突泉阳离子交换作用强度最弱,黑虎泉伴随有去白云化作用,潭西泉和珍珠泉水化学作用及强度类似,进一步印证潭西泉和珍珠泉有相同的补给来源及运移机制。该研究成果对水资源合理利用和岩溶大泉的保护具有重要意义。  相似文献   

A Directed-Line-Segment-Based Photogrammetry Method to Survey the Tunneling Working Surface of Mine Roadway     

Yufeng Mao  Hao Li  Biao Yang 《Journal of the Indian Society of Remote Sensing》2018,46(2):189-198

Absolute orientation is a basic technical work in digital image geologic logging of underground coal mine. Traditional control-point-based absolute orientation method requires setting object space control points of the known three-dimensional coordinates, which may lead to low efficiency. Therefore, this paper proposed a point-free close-range photogrammetry absolute orientation algorithm, which utilized direction line segments including plumb line segments and line segments with known directions and lengths to identify the dimensional orientation of a stereoscopic model. Experiment results show that the precision of the orientation results is favorable. σ _X and σ _Y are as high as 0.5 mm, and σ _Z is 0.3 mm. Finally, this paper introduced the application of the proposed algorithm in rapid geological logging of coal mine roadway, which was fast and reliable, convenient and feasible.  相似文献   

Deformation characteristics of a large landslide reactivated by human activity in Wanyuan city,Sichuan Province,China     

Zhao  Bo  Yuan  Lei  Geng  Xueyu  Su  Lijun  Qian  Jiangpeng  Wu  Huanheng  Liu  Mao  Li  Jia 《Landslides》2022,19(5):1131-1141

With the rapid urbanization, an increasing number of landslides have been induced by human activities. In this study, a typical human-induced landslide known as the Maobazi landslide, which was triggered by foundation pit excavation in Sichuan Province, China, was analyzed. An emergency investigation was carried out to detect the basic deformation characteristics, followed by implementations of multiple monitoring schemes and emergency control measures to monitor and control reactivated deposits. The reactivated deposits depicted rapid deformations with a maximum deformation exceeding 140 mm from July to September before the emergency control measures were completed. The reactivated deposits gradually settled and were finally controlled in 2019. The results showed that the 2019 Maobazi landslide was a large; reactivated landslide with a scale reached to 520 Mm³, which could result in catastrophic consequences if it slipped down to nearby residential areas.

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The Permian System of the Nujiang-Lancangjiang-Jinshajiang Area, Southwestern China     

Mao Junyi  et al 《地学前缘》2000,(Z1)

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基于GIS的零售商业网点选址评价模型研究   总被引：1，自引：0，他引：1  

赖志斌  潘懋  Yonghui Song 《地理信息世界》2009,7(2)

传统零售商业网点选址模型主要是基于统计的静态模型.分析了影响零售商业网点选址的人口、经济、市场竞争三个关键要素,结合GIS,提出了一种基于权重设置的零售商业网点选址评价模型,并阐述了模型的应用流程.该模型在深圳市罗湖区公共信息服务平台中进行了典型应用实现,并检验了模型的应用可行性.  相似文献