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页岩气成藏条件及我国黔南坳陷页岩气勘探前景浅析 被引量:56
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作者 杨振恒 李志明 +1 位作者 沈宝剑 韩志艳 《中国石油勘探》 CAS 2009年第3期24-28,共5页
页岩气具有自身的成藏机理,需要特殊的地质条件,其成藏主要受控于页泥岩厚度、面积、总有机碳含量、有机质成熟度、矿物岩石成分、压力和温度等因素。将页岩气评价总结为生气能力、储集气能力和易开采性3个方面。黔南坳陷页泥岩自下而... 页岩气具有自身的成藏机理,需要特殊的地质条件,其成藏主要受控于页泥岩厚度、面积、总有机碳含量、有机质成熟度、矿物岩石成分、压力和温度等因素。将页岩气评价总结为生气能力、储集气能力和易开采性3个方面。黔南坳陷页泥岩自下而上主要集中在震旦系陡山沱组、下寒武统、中寒武统、上泥盆统和二叠系。通过地球化学分析,认为该地区具有页岩气成藏的基本条件,其中下寒武统(∈1)黑色高碳质页岩系和二叠系吴家坪组(P2w)页泥岩分布面积广泛,厚度大,有机质含量和热演化程度高,并且含有较多的硅质成分,是最为有利的勘探层位。 展开更多
关键词 岩气 黔南坳陷 页泥岩 吸附 成藏条件
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Lower Es3 in Zhanhua Sag, Jiyang Depression: a case study for lithofacies classification in lacustrine mud shale 被引量:11
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作者 Yan Jian-Ping He Xu +4 位作者 Hu Qin-Hong Liang Qiang Tang Hong-Ming Feng Chun-Zhen Geng Bin 《Applied Geophysics》 SCIE CSCD 2018年第2期151-164,361,共15页
Oil and gas exploration in lacustrine mud shale has focused on laminated calcareous lithofacies rich in type Ⅰ or type Ⅱ1 organic matter, taking into account the mineralogy and bedding structure, and type and abunda... Oil and gas exploration in lacustrine mud shale has focused on laminated calcareous lithofacies rich in type Ⅰ or type Ⅱ1 organic matter, taking into account the mineralogy and bedding structure, and type and abundance of organic matter. Using the lower third member of the Shahejie Formation, Zhanhua Sag, Jiyang Depression as the target lithology, we applied core description, thin section observations, electron microscopy imaging, nuclear magnetic resonance, and fullbore formation microimager (FMI) to study the mud shale lithofacies and features. First, the lithofacies were classified by considering the bedding structure, lithology, and organic matter and then a lithofacies classification scheme of lacustrine mud shale was proposed. Second, we used optimal filtering of logging data to distinguish the lithologies. Because the fractals of logging data are good indicators of the bedding structure, gamma-ray radiation was used to optimize the structural identification. Total organic carbon content (TOC) and pyrolyzed hydrocarbons (S2) were calculated from the logging data, and the hydrogen index (HI) was obtained to identify the organic matter type of the different strata (HI vs Tmax). Finally, a method for shale lithofacies identification based on logging data is proposed for exploring mud shale reservoirs and sweet spots from continuous wellbore profiles. 展开更多
关键词 mud shale lithofacies FILTERING fractals LOGGING
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Coupled effects of stress damage and drilling fluid on strength of hard brittle shale 被引量:1
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作者 汪伟 邓金根 +3 位作者 蔚宝华 郑小锦 闫传梁 邓月 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第12期3256-3261,共6页
During well drilling process,original stress state of hard brittle shale will be changed due to stress redistribution and concentration,which leads to stress damage phenomenon around the borehole.Consequently,drilling... During well drilling process,original stress state of hard brittle shale will be changed due to stress redistribution and concentration,which leads to stress damage phenomenon around the borehole.Consequently,drilling fluid will invade into formation along the tiny cracks induced by stress damage,and then weaken the strength of hard brittle shale.Based on this problem,a theoretical model was set up to discuss damage level of shale under uniaxial compression tests using acoustic velocity data.And specifically,considering the coupled effect of stress damage and drilling fluid,the relationship between hard brittle shale strength and elapsed time was analyzed. 展开更多
关键词 hard brittle shale stress damage drilling fluid time effect STRENGTH
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Geological characteristics and shale gas distribution of carboniferous mudstones in the Tarim Basin,China
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作者 Luofu Liu Jinqi Qiao +2 位作者 Baojian Shen Xinyi Lu Yueshu Yang 《Acta Geochimica》 EI CAS CSCD 2017年第2期260-275,共16页
Extant research on Paleozoic mudstone is well developed in the Tarim Basin, while the research on Carboniferous mudstone is relatively weak. Through systematic study of lithology, geochemical characteristics,reservoir... Extant research on Paleozoic mudstone is well developed in the Tarim Basin, while the research on Carboniferous mudstone is relatively weak. Through systematic study of lithology, geochemical characteristics,reservoir characteristics and gas–bearing properties of Carboniferous mudstone in the Tarim Basin, this study aims to provide a geological basis for the Paleozoic shale gas exploration and development, favorable zone optimization, and resource potential evaluation in the Tarim Basin. The results show that the sedimentary environments of organic-rich mudstone in the study area were mainly basin facies and slope facies. Lithology is dominated by black carbonaceous mudstone, followed by calcareous mudstone, siliceous mudstone, and siliceous rocks. Mudstone is mainly developed in the Kalashayi Formation,which is located in the Bachu and Markit slope belt, with the cumulative thickness of 30–200 m. The organic carbon content is commonly more than 0.4%, and the organic matter types are type II and type III. Thermal evolution degree is widely distributed from a low mature to over mature stage, and different tectonic units have a greater difference. The contents of quartz plus feldspar are between 12% and 82.5%, with an average of 45.8%. Thecontent distribution of clay mineral is from 12% to 57%,with an average of 38.2%. Carbonate minerals(mainly siderite) content is below 50%. The brittle mineral content of the mudstone is approximately 65%, with a strong compressibility, and the mudstone has the material basis of forming crack and natural fracture. Microscopic pores in micro–nanometer level are well developed in the mudstone, including micro bedding joint, microcrack,interbedded pores of clay mineral, nanoscale intragranular or edge pores in the massive organic matter, bioclastic micropores, and mineral dissolution pores, etc. According to the standards provided by the Ministry of Land and Resources in China, the Kalashayi Formation in Bamai Area is a favorable area for shale gas development. 展开更多
关键词 Hydrocarbon generation potential Reservoir characteristics Shale gas MUDSTONE CARBONIFEROUS Tarim Basin
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Cementing Properties of Oil Shale Ash
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作者 FENG Xiang-peng NIU Xue-lian +2 位作者 BAI Xue LIU Xiao-ming SUN Heng-hu 《Journal of China University of Mining and Technology》 EI 2007年第4期498-502,共5页
The oil crisis has prompted renewed interest in direct burning of oil shale as an alternative energy source. A major problem in this process is the large portion of ash produced. The cementing properties of this ash w... The oil crisis has prompted renewed interest in direct burning of oil shale as an alternative energy source. A major problem in this process is the large portion of ash produced. The cementing properties of this ash were investi-gated to determine its applicability as a building material. By means of XRD,IR,NMR and ICP,we have studied the effects of burning temperature on the reactivity of ash. Maximum reactivity was obtained with ash samples produced at 700℃ to 900℃. In this range,the strength of oil-shale-based material,with properties similar to cement,which is composed of oil shale and several other kinds of solid wastes,can achieve the standard of 42.5^# cement. Our study has provided an experimental foundation and theoretical base for a massive utilization of oil shale. 展开更多
关键词 oil shale thermal activation cementitious activity
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Analysis of the mechanical property of mudstone/shale in paralic coal measures and its influence factors 被引量:2
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作者 Zhao-ping MENG Xian-mingXIAN 《Journal of Coal Science & Engineering(China)》 2013年第1期1-7,共7页
The mechanical property of mudstone/shale in coal measures is a key factor of engineering mechanics that influences the development of shale gas. A rock mechanics test was performed in order to analyze the complete st... The mechanical property of mudstone/shale in coal measures is a key factor of engineering mechanics that influences the development of shale gas. A rock mechanics test was performed in order to analyze the complete stress-strain mechanic characteristics and influence factors of mudstone/shale in paralic coal measures, from the Carboniferous-Permian periods in a coal field of Northern China. The relationship between the mechanical properties of mudstone/shale in coal measures, and its chemical component, water content are established, and their models are constructed. Research results show that mud- stone/shale has low mechanical strength, low elastic modulus and a high Poisson's ratio. The complete stress-strain curve has apparent elastoplastic deformation characteristics, and after reaching peak strength, it exhibits obvious strain softening characteristics. The uniaxial compressive strength of mudstone/shale and its elastic modulus increases exponentially with the increase of SiO2 content, and as the ignition loss increases, the uniaxial compressive strength and elastic modulus of mudstone/shale will decrease according to the law of power function. The compressive strength of mudstone/shale and its elastic modulus will decrease with the increase of water content in mudstone/shale. 展开更多
关键词 coal measure mudstone/shale mechanical property influence factors
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Effect of distortion degree on the hydration of red mud base cementitious material
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作者 SUN Wen-biao FENG Xiang-peng ZHAO Guang-xing 《Journal of Coal Science & Engineering(China)》 2009年第1期88-93,共6页
The interaction of Si anions with Al sites during the hydration process was observed by NMR, IR and SEM to understand the reaction mechanism of the hydrates formation mixed with oil shale calcined at different tempera... The interaction of Si anions with Al sites during the hydration process was observed by NMR, IR and SEM to understand the reaction mechanism of the hydrates formation mixed with oil shale calcined at different temperatures. As the reaction progressed, the coordination of Al (Ⅳ, Ⅴ, and Ⅵ) changed almost completely to Ⅳ, when mixed with oil shale calcined at 700 ℃. However, when mixed with oil shale calcined at 400 ℃, some 6-coordination of Al still remained in the hydrates. Under the function of alkaline solutions, which were produced with the hydration of clinker, a certain amount of Si and Al atoms dissolved or hydrolyzed from aluminosilicate, formed geomonomers in solutions, and then polycondensed to form networks. 展开更多
关键词 distortion degree hydration mechanics red mud base cementitious material
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