页岩气基础地质调查皖南地1井钻探施工技术          下载免费PDF全文

刘文武  赵志涛  翁炜  朱迪斯  单文军  贺云超 《探矿工程》2018,45(10):66-70

皖南地1井是部署在安徽省南陵县烟墩镇的一口页岩气基础地质调查井。文章详细介绍了该井的钻探施工工艺技术以及遇到复杂问题的处理方法,并对钻效进行了分析,提出了实现优质高效钻探的措施。项目的顺利实施,梳理了皖南地区地层层序,为页岩气储层理论推测提供了有力的实物数据支撑和验证。  相似文献   

内蒙古北山额勒根乌兰乌拉一带土壤测量地球化学特征及找矿方向     

张善明  兰生科  贺中银  韩志敏  陈强  王永晖 《现代地质》2018,32(4):655

研究区位于内蒙古北山北带,成矿地质条件优越,1∶20万水系沉积物测量异常明显,且分布有额勒根乌兰乌拉斑岩型钼(铜)矿。以1∶5万土壤地球化学测量成果为依据,以地质认识为基础,研究了区内元素地球化学数据特征、地球化学场特征及综合异常特征。认为区内主成矿元素为Mo、Cu、Au,主要的控矿层位为咸水湖组火山岩段,成矿有利侵入体为石炭纪花岗闪长岩。划分出5种综合异常类型,其中与斑岩钼(铜)矿系统有关的综合异常和与奥陶系建造有关的综合异常是今后解剖找矿的重点。  相似文献   

Depositional setting,provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc,northwest Pacific (IODP Expedition 352)     

Alastair H. F. Robertson  Steffen Kutterolf  Aaron Avery  Alan T. Baxter  Katerina Petronotis  Gary D. Acton 《International Geology Review》2018,60(15):1816-1854

New biostratigraphical, geochemical, and magnetic evidence is synthesized with IODP Expedition 352 shipboard results to understand the sedimentary and tectono-magmatic development of the Izu–Bonin outer forearc region. The oceanic basement of the Izu–Bonin forearc was created by supra-subduction zone seafloor spreading during early Eocene (c. 50–51 Ma). Seafloor spreading created an irregular seafloor topography on which talus locally accumulated. Oxide-rich sediments accumulated above the igneous basement by mixing of hydrothermal and pelagic sediment. Basaltic volcanism was followed by a hiatus of up to 15 million years as a result of topographic isolation or sediment bypassing. Variably tuffaceous deep-sea sediments were deposited during Oligocene to early Miocene and from mid-Miocene to Pleistocene. The sediments ponded into extensional fault-controlled basins, whereas condensed sediments accumulated on a local basement high. Oligocene nannofossil ooze accumulated together with felsic tuff that was mainly derived from the nearby Izu–Bonin arc. Accumulation of radiolarian-bearing mud, silty clay, and hydrogenous metal oxides beneath the carbonate compensation depth (CCD) characterized the early Miocene, followed by middle Miocene–Pleistocene increased carbonate preservation, deepened CCD and tephra input from both the oceanic Izu–Bonin arc and the continental margin Honshu arc. The Izu–Bonin forearc basement formed in a near-equatorial setting, with late Mesozoic arc remnants to the west. Subduction-initiation magmatism is likely to have taken place near a pre-existing continent–oceanic crust boundary. The Izu–Bonin arc migrated northward and clockwise to collide with Honshu by early Miocene, strongly influencing regional sedimentation.  相似文献   

西藏多龙矿区生态环境遥感调查研究     

王俊华 《地质与勘探》2018,54(4):781-790

本文依托项目《西藏多龙矿床技术经济与环境综合评价》,利用高分二号、资源三号及landsat8等多源遥感数据对西藏多龙矿区生态地质环境进行调查研究。通过遥感技术与实地调查结合,查明了矿区生态地质环境现状,取得了涵盖人类活动、矿山地质活动、河流湖泊现状、植被覆盖与荒漠化情况等内容的专题成果。研究结果表明,砂金矿开采及尾矿堆积物给当地生态环境造成不可逆破坏,同时探槽、钻孔及地表金属污染等也给生态环境带来一定程度的影响。通过对目前中国矿储量第一的多龙铜多金属矿床进行开发前全面、综合的生态地质环境调查研究,能够为藏北矿山开发对生态地质环境的影响评估提供科学依据,为西藏多龙矿区建设绿色矿山和绿色开发提供建议及决策依据。  相似文献   

Petrophysical characterisation of tight sandstone gas reservoirs using nuclear magnetic resonance: a case study of the upper Paleozoic strata in the Kangning area,eastern margin of the Ordos Basin,China     

Y. Y. Huyan  T. S. Liu  F. J. Jiang  X. Z. Chen  X. Q. Ma 《Australian Journal of Earth Sciences》2018,65(6):863-875

Residual and movable porosity are significant parameters for characterising petrophysical properties, especially in tight reservoirs. Eight tight sandstone samples from the upper Paleozoic gas-bearing strata in the Kangning area, from the eastern margin of the Ordos Basin, were analysed using nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), petrography, and porosity and permeability tests. The lithology and pore types were identified and classified using petrography and SEM. The residual and movable porosity were obtained with NMR. In addition, NMR was used to visualise pore structure and pore size distribution. The results suggest that the upper Paleozoic sandstones in the study area mainly comprise feldspathic litharenite and litharenite. The sandstone porosity and permeability are low, with means of 5.9% and 0.549 mD, respectively. Four pore types exist in the tight sandstones: residual primary pores, grain dissolution pores, micropores (clay-dominated) and microfractures. The T₂ spectra under water-saturated conditions correlate with pore size and can be used to distinguish small and large pores based on the transverse relaxation time cutoff value of 10 ms, which corresponds to a pore diameter of 0.232 μm. Small pores account for 72% of the pores in the tight sandstones. The continuous bimodal T₂ spectra suggest good connectivity between small and large pores, despite the low porosity and permeability. In this study, the movable porosity of the major tight sandstone gas reservoirs is higher than the residual porosity, which confirms the effective evaluation of movable porosity to tight sandstone reservoirs, based on NMR experiments.  相似文献   

Magnetic measurements in electrical prospecting by resistivity methods     

V.S. Mogilatov  N.O. Kozhevnikov  A.V. Zlobinsky 《Russian Geology and Geophysics》2018,59(4):432-437

The electrical resistivity and induced polarization (IP) methods are widely used in geological mapping, prospecting and exploration of mineral deposits, engineering geology, hydrogeology, archaeology, and geotechnical and environmental applications. Historically, these methods have formed the basis of the electrical prospecting technique. In these methods, a DC or low-frequency AC electrical current is introduced into the earth through a grounded transmitter line. The measured quantity is the electric field. However, if the earth’s resistivity or chargeability changes horizontally, this change gives rise to an anomalous magnetic field, which is studied by the magnetometric resistivity (MMR) and magnetic induced polarization (MIP) methods, respectively. Along with advantages, some shortcomings are inherent in the MMR and MIP techniques. Apparently, the main drawback of these methods is that the magnetic fields of both the transmitter line wire and ground electrodes on the surface are several orders of magnitude greater than the anomalous magnetic field response. This introduces a significant “noise” to magnetic-resistivity data. We investigate the potential of using a circular electric dipole (CED) in magnetometric resistivity techniques. It has been found that the application of a CED, instead of a conventional transmitter line, dramatically enhances the signal-to-noise ratio.  相似文献   

发射光谱法测定区域化探样品中的Pb、Sn、Mo、V元素     

邬晓蒙 《地质与资源》2018,27(6):582-585

采用发射光谱法测定区域化探样品中Pb、Sn、Mo、V元素,以焦硫酸钾、氟化钠、三氧化二铝和碳粉的混合物为固体缓冲剂,采用外加内标法以锗（Ge）作为内标元素,选择合适的分析线对,选取国家一级地球化学标准物质（GBW水系沉积物、土壤）平行测定（n=12次）.测试结果准确度达到规范要求,满足区域化探样品的检测要求.  相似文献   

油铀兼探的找矿思路在松辽盆地的应用——以中央拗陷区南部为例   总被引：1，自引：0，他引：1  

张森  石蕾  鞠楠  苏建伟 《地质与资源》2018,27(3):257-262

以"油铀兼探"的找矿思路,带动松辽盆地中南部开展砂岩型铀矿调查选区及钻探验证工作.将异常强度250 API和450 API确定为划分潜在铀矿孔、潜在铀矿化孔和正常孔的关键技术指标,对中央拗陷区南部1572个钻孔进行异常筛查工作.排查发现潜在铀矿孔362个,潜在铀矿化孔223个.对191号钻孔和36号钻孔进行钻探验证,发现1个工业孔、1个异常孔.认为区内寻找砂岩型铀矿的有利地段为油田区反转构造形成的隆起区边部四方台组河流相砂体,并总结了中央拗陷区南部6种主要控矿因素.  相似文献   

地物化方法在航磁异常查证中的应用     

田宇  祁程  杨金政  沈正新  汪哲  张文峰 《地质与资源》2018,27(4):406-410

航磁异常查证是矿产勘查中的一个重要环节,其目的是通过地面查证,确定异常是否存在,追踪异常源,了解异常源所处的地质环境,对异常作出客观评价,提出进一步工作的建议,为后续资料解释提供依据.通过使用地物化综合方法对黑C-2011-02243号异常查证发现：地质剖面测量和土壤地球化学测量可在地表发现较好的找矿线索;高精度磁测及激电中梯测量则反映了深部地质体及矿化特征.依据查证结果认为,在进行航磁异常查证工作时,可优先进行剖面性的地质、高精度磁法及土壤地球化学测量工作;在分析上述测量结果的基础上安排剖面性的电法测量;如存在进一步找矿信息,可安排面积性物化探测量及工程验证工作.  相似文献   

三江盆地前进坳陷油气地质调查新进展     

张文浩  周新桂  李世臻  张交东  王丹丹  刘卫彬  林燕华  孟元林  周锡明 《地质通报》2018,37(6):1157-1165

随着东北大型含油气沉积盆地油气勘探难度越来越大,老油田开发程度已进入中后期,亟需新的油气区接替。三江盆地作为松辽盆地外围7个一级远景盆地之一,具有较大的油气勘探潜力。最近在三江盆地前进坳陷开展了一系列油气地质调查工作,在中生界泥页岩、晚古生界暗色泥岩地层及硅质岩生烃潜力方面取得了新的进展与认识,对评价该区油气资源潜力、进行下一步油气勘探工作具有重要意义。  相似文献