油气成藏期次的研究现状和发展趋势     

于涛 《四川地质学报》2008,28(4):290-292

从油气成藏研究的发展阶段入手讨论了油气成藏期研究方法的演变,提出了在油气分异特征、包裹体分析、储层沥青分析和成岩矿物年代学等研究的基础上,结合盆地构造演化史、沉积埋藏史、烃源岩热演化史以及各种成藏条件的有效匹配,综合分析油气成藏期次、过程的方法。  相似文献   

一种适用于煤层气井的新型堵漏剂     

宋生印  殷振献 《煤田地质与勘探》1998,(Z1)

利用海藻胶下脚料,添加纤维状物质和高分子聚合物研制的一种新型堵漏剂,其封堵能力强,可承受较大的压力差,能用化学方法将其降解,从而对地层,特别是煤层不产生永久性伤害,适用于煤层气和其它需要对储层加以保护的钻井。  相似文献   

大直径瓦斯孔穿采空区施工技术          下载免费PDF全文

陈平安 《探矿工程》2016,43(10):209-214

针对大直径钻孔采空区施工技术难题,结合新庄孜矿大直径瓦斯孔工程实例,对大直径钻孔采空区施工工序、成孔技术与下管固井工艺等施工难点进行了分析和探讨,总结了大直径瓦斯孔采空区的重点施工技术。对遇到类似工程的施工单位可供借鉴。  相似文献   

新型水基钻井液体系在页岩气钻井中应用探讨          下载免费PDF全文

方静  肖绪玉 《探矿工程》2016,43(7):96-102

目前中国页岩气水平井水平段钻井主要使用油基钻井液,但油基岩屑处理费用昂贵,急需开发和应用一种具有环境保护特性的高性能水基钻井液体系。通过室内实验,优选出适合于水基钻井液的封堵剂、降失水剂等主要处理剂,进而研制出了钾铵基聚磺成膜钻井液体系配方,并进行了抗温性、润滑性、防塌抑制性、封堵性、抗污染性性能评价实验。结果表明：钾铵基聚磺钻井液流变性能良好,抗温可达150 ℃;润滑性能优良,具有较好的抗盐、抗钙污染性能和防漏封堵性能,防塌抑制性强。  相似文献   

Discrete element modelling of creep of asphalt mixtures     

Wei Cai  Gordon Airey  John de Bono 《Geomechanics and Geoengineering》2016,11(1):64-72

Creep tests on asphalt mixtures have been undertaken under four stress levels in the laboratory while the discrete element model (DEM) has been used to simulate the laboratory tests. A modified Burger’s model has been used to represent the time-dependent behaviour of an asphalt mixture by adding time-dependent moment and torsional resistance at contacts. Parameters were chosen to give the correct stress-strain response for constant strain rate tests in Cai et al. (2013). The stress-strain response for the laboratory creep tests and the simulations were recorded. The DEM results show reasonable agreement with the experiments. The creep simulation results proved to be dependent on both bond strength variability and positions of the particles. Bond breakage was recorded during the simulations and used to investigate the micro-mechanical deformation behaviour of the asphalt mixtures. An approach based on dimensional analysis is also presented in this paper to reduce the computational time during the creep simulation, and this analysis is also a new contribution.  相似文献   

The Tianjin geothermal field （northeastern China）： Geochemistry and implications for possible plugging phenomena     

Angelo Minissale Daniele Borrini Giordano Montegrossi Franco Tassi Orlando Vaselli Antonio Delgado Huertas Wanqing CHENG Jincheng YANG Xuzhou CHENG 《中国地球化学学报》2006,25(B08):148-148

The low-enthalpy geothermal system of Tianjin is located in and around the City of Tianjin （China）, in the NE part of the North China plain, a tectonic depression affected by subsidence since the Neogene. The regional aquifer system is from the top to the bottom, as follows： （1） the ＂Quaternary aquifer＂, in continental sediments; （2） the ＂Tertiary aquifer＂, in the continental depositional series; （3） the ＂Lower Palaezoic-Sinian aquifer＂, in Ordovician-Sinian calcareous rocks. Shallow （300-600 m） and deep （up to 2600 m） producing wells discharge water at up to 50 and 90 C, respectively. Exhausted fluid re-injection started in the 90＇s. Subsequently, a reduction in the injection process was observed, suggesting that sealing or plugging occurred in the reservoir（s）. The present work, based on chemical and isotopic data on fluids and minerals from productive and re-injection wells, describes the causes of the permeability reduction at the bottom hole of the re-injection wells. Geochemical data processing using speciation codes indicates that （1） sealing caused by precipitation of both calcite or amorphous silica is very unlike; （2） the saturation indices for several Fe and Zn sulfides and hydroxides are very positive, although fluids have neutral pH and low temperature （Fe- and Zn-rich minerals are present mainly as transported solids）; （3） pipes, casings, heat exchangers and steel flames are made of low-quality Fe and show evident oxidation effects; casings and producing liners in the wells are likely in the same conditions; （4） thermal fluids sampled in summer, when most wells are shut down, are characterized by more negative redox potential and lower pH than those collected in winter, probably because in summer there is less casing-hot water interaction and, consequently, Fe-oxidation in the casing is reduced. Accordingly, the plugging problem does not seem to be a natural process related to the chemical characteristics of the produced fluid. It is, on the contrary, possibly induced by the oxidation of casings, pumps, pipes, etc.  相似文献   

地铁车站主体结构渗漏及堵漏   总被引：1，自引：0，他引：1  

黄志兵 《上海国土资源》2004,(1):57-59,62

地铁工程建设中，结构渗漏的堵漏工作非常重要，实际施工十分复杂，对整个工程质量有重大影响。该文总结了长期项目施工中的有效经验，并以某车站主体结构工程为例，详细介绍了该车站主体结构自防水设计及施工工艺，对结构渗漏的原因及具体的堵漏施工方法进行了探讨。  相似文献   

贵州省旦坪铝土矿钻探施工工艺          下载免费PDF全文

邓鹏  黄明勇  方青  陈涛 《探矿工程》2021,48(3):78-85

贵州正安旦坪铝土矿项目地层岩石破碎,岩溶发育,钻探施工中遇掉块卡钻、套管难以起拔以及溶洞发育等难题。通过优化钻孔结构、合理选择钻进参数,采用跟管钻进配合绳索取心工艺,有效解决了溶洞堆积层的护壁难题,大大提高了溶塌堆积层成孔率。采用聚合物凝胶护壁堵漏减少了破碎地层掉块卡钻事故的发生。反丝套管的使用,减轻了坍塌地层丢套管的风险,提高了钻进效率,节约了钻探成本。采用长套管穿越溶洞,降低了报废工作量,提高了工作进度。物探瞬变电磁法的应用查明了岩溶的空间分布情况,降低了钻遇大溶洞的风险。通过一系列技术措施的实施,如期完成了目标任务。本文对该矿区的施工经验进行了总结,以期为同类钻探施工起到借鉴作用。  相似文献   

巴什布拉克含铀地沥青铀矿床矿化特征和成矿机理     

刘正义  许强  刘红旭  董文明  秦明宽  刘佳林  朱泉龙 《西北地质》2021,(1)

通过实地和显微镜观察、取样、分析测试等方法,取得大量实际资料,着重研究巴什布拉克矿床铀与石油产区含地沥青铀矿床之间等内在联系,利用所取得的大量数据对地沥青及其铀矿化特征和成矿机理予以讨论,认为巴什布拉克与石油密切相关的大型含地沥青铀矿床为一种既有承压水的层间氧化为主、又有潜水氧化,特别与石油热演化、油气破坏产物地沥青和油气还原(H2、CH4)、热液(水)蚀变、碳酸盐水洗、渗漏与扩散等因素有关的复成因类型。石油含铀和多金属,与其氧化为沥青增加对铀吸附性,以及存在还原性气体具有极强的还原铀能力有关,地沥青既具有在酸性介质中发生吸附铀,又能在弱碱性介质中还原铀的能力。  相似文献   

砂土中桶形基础静压沉贯过程桶-土受力分析     

朱小军  李文帅  费康  孔伟阳  龚维明 《岩土力学》2019,40(1):199-206

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