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苏里格气田西区苏48区块储层微观特征及其对储层的影响作用 总被引:1,自引:0,他引:1
根据鄂尔多斯盆地苏里格气田西区苏48区块盒8段-山1段储集砂岩的岩石薄片、铸体薄片、扫描电镜、X-射线衍射、高压压汞及核磁共振等测试分析数据,精细表征了盒8段-山1段储层微观特征。研究表明:砂岩类型以岩屑石英砂岩、石英砂岩为主,盒8段储层孔隙类型以粒间孔、岩屑溶孔和晶间孔为主,盒下8亚段孔喉半径较大,喉道发育程度较好,其有效孔隙个数和体积均高于其他储层。山1段孔隙类型主要有岩屑溶孔、晶间孔、凝灰质溶孔以及长石溶孔,山1段孔喉半径较小。盒8段-山1段喉道类型主要有管束状喉道、片状喉道和点状喉道,分选性均为中等-差,排驱压力相差不大。通过高压压汞和核磁共振提供的喉道半径以及可动流体饱和度的精细表征结果,将研究区储层划分为4类,明确储层差异的原因是受到碎屑成分、孔隙类型、结构及非均质性的共同影响。 相似文献
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鄂尔多斯盆地山2段砂岩储层的孔隙类型与孔隙结构 总被引:2,自引:2,他引:2
在铸体薄片鉴定、粒度分析、压汞曲线及物性分析统计的基础上,对鄂尔多斯盆地山2段砂岩储层的孔隙类型、孔隙结构等微观特征进行了深入分析,结果表明:山2段储集空间主要为粒间溶孔、原生残余粒问孔、岩屑粒内溶孔、杂基溶孔和高岭石晶间孔,局部发育微裂隙;渗透率随孔隙度的增大而增大,而孔隙度和渗透率的大小又与砂岩的孔隙结构有关.根据砂岩的压汞参数及物性特征,划分出4类储层:Ⅰ类--优质储层,主要发育粒间溶孔.具有较好的颗粒支撑.孔隙连通性好;Ⅱ类—较好储层,其储集空间为粒间溶孔—粒内溶孔—高岭石晶间孔组合;Ⅲ类--较差储层.主要发育残余粒问孔—高岭石晶间孔组合;Ⅳ类--差储层,仅发育孤立微孔.指出粗粒结构与含砾支撑结构的石英砂岩储层物性较好;含砾支撑结构储层具有双众数粒度分布特征.有利于孔隙水的流动,促进填隙物溶蚀和粒间溶孔的形成,使得储层的渗透率得到提高. 相似文献
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赵凹油田安棚区深层系低渗致密砂岩储层特征 总被引:2,自引:1,他引:2
泌阳凹陷赵凹油田安棚区深层系主要指埋深大于3 000 m的核三下段,属扇三角洲沉积.岩芯描述和常规薄片、铸体薄片、扫描电镜、X-衍射分析及压汞资料研究表明,安棚深层系的岩石类型主要为岩屑砂岩、长石岩屑砂岩和岩屑长石砂岩.快速堆积,颗粒大小混杂,分选差,成分成熟度和结构成熟度低,是导致深层系砂岩低渗的基础条件;砂岩储层以扇三角洲前缘的水道砂和河口坝砂物性最好,席状砂次之;储层孔隙类型以次生溶孔和残余粒间孔为主,孔隙小,具两种孔隙介质,喉道细小且不均匀,孔喉分布状况差,结构复杂,为典型的特低孔特低渗储层;成岩作用,特别是压实作用和晚期碳酸盐胶结充填作用是影响储层微观非均质性和导致储层致密低渗的主要因素. 相似文献
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泌阳凹陷赵凹油田安棚区深层系主要指埋深大于3 000 m的核三下段,属扇三角洲沉积.岩芯描述和常规薄片、铸体薄片、扫描电镜、X衍射分析及压汞资料研究表明,安棚深层系的岩石类型主要为岩屑砂岩、长石岩屑砂岩和岩屑长石砂岩.快速堆积,颗粒大小混杂,分选差,成分成熟度和结构成熟度低,是导致深层系砂岩低渗的基础条件;砂岩储层以扇三角洲前缘的水道砂和河口坝砂物性最好,席状砂次之;储层孔隙类型以次生溶孔和残余粒间孔为主,孔隙小,具两种孔隙介质,喉道细小且不均匀,孔喉分布状况差,结构复杂,为典型的特低孔特低渗储层;成岩作用,特别是压实作用和晚期碳酸盐胶结充填作用是影响储层微观非均质性和导致储层致密低渗的主要因素. 相似文献
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应用铸体薄片、扫描电镜、三维CT扫描、高压压汞和恒速压汞等方法,对苏里格气田苏6区块盒8段致密砂岩储层的微观孔隙结构特征进行定量表征,探讨孔隙结构差异性成因,进而优选出反映致密砂岩微观孔隙结构特征的储层评价参数。结果表明:储层孔隙类型主要为(颗粒、胶结物)溶孔、黏土矿物晶间孔及少量残余粒间孔;不同渗透率的储层孔隙半径差别不明显,但喉道半径分布差异较大,储层越致密,喉道半径分布范围越小、小喉道所占比例越高,喉道占有效储集空间的比例也越高;中粗粒岩屑石英砂岩和中粗粒岩屑砂岩结构成熟度高、原始孔隙度高、溶蚀作用强烈,溶蚀孔隙所占比高,形成的半径大于1μm的孔喉含量显著增加;细粒(长石)岩屑砂岩分选差、原始孔隙度低,溶蚀作用弱,孔隙类型主要为黏土矿物晶间孔,形成的孔喉主要为半径小于1μm的孔喉;主流喉道半径对储层渗流能力起主要控制作用,并且可以很好地反映储层的孔喉分布、有效储集空间及非均质性等微观孔隙结构特征,应当作为致密砂岩储层重要的储层评价参数。 相似文献
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单向水平流动压汞与常规压汞技术对比研究 总被引:3,自引:0,他引:3
低渗透油气藏对地层有效应力很敏感,用常规压汞技术测得的三维应力释放后的岩样孔喉分布实际是视孔喉分布,与地下状态会有很大出入。用焉耆盆地宝浪油田20块低孔低渗天然柱状岩心,分成20对平行样,分别采用有效应力下单向水平流动压汞技术和常规压汞技术测定它们的压汞曲线,进行2种实验技术的对比实验研究。与常规压汞技术测定结果相比,在有效应力作用下的单向水平流动压汞技术测得的岩样毛细管排驱压力、中值压力大幅度增加(分别增加77.89%和58.16%),孔喉的最大半径和中值半径大幅度降低(分别降低75.4%和61.17%),喉道分选性变好,空气渗透率降低幅度大(71.62%),孔隙度降低幅度较小(13.08%)。单相水平流动压汞与常规压汞所得的低渗透油藏的孔喉分布特征参数差别大,但二者相关性良好,在对低渗透油藏岩样进行大量常规压汞测试的同时,进行少量的单向水平流动压汞与常规压汞对比实验,就可由大量常规压汞资料准确获得地层有效应力作用下低渗透油藏储集层的孔隙结构特征参数。图4表1参3(郭海莉摘) 相似文献
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《Food Control》2015
The present study aimed to evaluate possible conversion or loss of Hg species (Hg2+ and CH3Hg+) during different culinary treatments of six fish species. Four cooking procedures (uncooked, boiling, frying and roasting) and the influence of three commonly used cooking conditions (no spices, with salt, and with salt and lemon juice) were also evaluated for each treatment, creating a total of 12 types of culinary treatment for each fish species. Oil and water used during cooking procedures and the used spices like salt and lemon were analyzed to assure a close mass balance of total Hg. After each culinary treatment, samples were immediately freeze-dried. Mercury species were identified and quantified by liquid chromatography–chemical vapor generation–inductively coupled plasma mass spectrometry. No significant conversion of Hg species was observed with any of the evaluated cooking treatments. On the other hand, an overall loss of up to 33% of Hg species was observed after frying. Most of the Hg lost during the cooking procedure came from CH3Hg+. 相似文献
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《石油勘探与开发》2000
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辽河坳陷天然气中汞的成因及地球化学意义 总被引:9,自引:1,他引:9
汞是天然气中常见的非烃气态组分,含量变化范围很大。前人研究认为,天然气中的汞含量主要受气源岩母质类型影响,煤型气汞含量相对较高,油型气汞含量相对较低,因而将其作为判识天然气类型的一种地球化学指标。但在辽河坳陷,东部凹陷部分地区和西部凹陷油型气的汞含量(14.4~1930μg/m3)明显高于东部凹陷煤型气的汞含量(25.2~52.5μg/m3),同时其天然气比我国产自稳定克拉通盆地的天然气要异常富集汞。对此进行的研究表明:天然气(尤其是油型气)中汞含量明显受盆地构造背景和深部地质过程的影响,与源岩母质类型没有明显相关性;天然气中汞含量与稀有气体3He/4He比值具有明显的正相关关系,表明天然气中一部分汞可能是来自地球深部的挥发分或与深部地质过程有关。图2表1参6(王孝陵摘) 相似文献
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《Food Control》2016
The presence of organic mercury (methylmercury) in tuna, salmon and kani sushis marketed in restaurants specialising in Japanese foods (Campinas, São Paulo, Brazil), was investigated by atomic absorption spectrometer with thermal decomposition and amalgamation. Total mercury was analyzed directly, whilst organic mercury was quantified after a previous extraction with toluene in an acid solution, assisted by microwaves. Under these analytical conditions there was no interconversion between the inorganic and organic mercury. High sensitivity was observed for organic mercury, with limits of detection and quantification of 2.0 and 6.6 μg kg−1. The organic mercury contents ranged from 12 to 583 μg kg−1, 6.6 to 8.2 μg kg−1 and no detected values, for the tuna, kani and salmon sushi, respectively. The mean proportion of organic Hg/total Hg for tuna sushi was 88%, indicating that the most toxic form of mercury, organic Hg, predominate in this food. The estimated exposure to methylmercury was made by taking into account the Provisional Tolerable Weekly Intake (PTWI 1.6 μg/kg) considering the daily consumption of 150 g and 20 g per adults (60 kg) and children (15 kg), respectively. Our results demonstrated that the consumption of tuna sushi may exceed 100% of PTWI. 相似文献
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海南福山油田天然气脱汞技术 总被引:9,自引:0,他引:9
大多数天然气的主要成分是气体烃类,此外也含少量非烃类气体,个别天然气中还含有微量的惰性气体(如氦、氩),甚至含有极微量的元素汞等,我国海南福山油田个别天然气中就含有元素汞。尽管其含量极微,但它仍有可能引起天然气凝液回收等装置中板翅式换热器的腐蚀泄漏,危害极大,故必须脱除。为此,介绍了该油田的天然气脱汞技术:在预处理系统中增加了脱汞塔,采用浸渍硫的活性炭脱除其中的汞,经分子筛干燥器脱水后的气体进入脱汞塔顶部脱汞。2007年3月脱汞装置投入运行后效果良好,脱汞后的气体中检测不出汞含量。 相似文献
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PEI (polyethylenimine) functionalized magnetic amorphous carbon thin film nano composite (Fe3O4-PEI-ACTF NC), was successfully synthesized and characterized by High Resolution Transmission Electron Microscope (HR-TEM), X-ray diffraction (XRD), Fourier-transform infrared spectrometer (FTIR), and Thermo gravimetric analysis (TGA). The synthesized nano composite Fe3O4-PEI-ACTF was developed as a highly efficient adsorbent for Hg(II) from aqueous samples. Effect of pH, contact time, adsorbent dose, initial concentration and temperature were investigated and optimized through batch adsorption technique. Besides, good magnetic performance of Fe3O4-PEI-ACTF NC makes it easily recovered from water with magnetic separation at low magnetic field. The adsorption kinetic data described well with the pseudo-second-order model and the equilibrium data fitted well to Langmuir isotherm model. The maximum adsorption capacity was 714?µg/g of Hg(II). Thermodynamic studies (ΔG°?<?0, ΔH°?>?0, ΔS°?>?0) implied an endothermic and spontaneous adsorption process in nature. Furthermore, the excellent reproducibility indicated that Fe3O4-PEI-ACTF NC has a promising application for removing heavy metals from aqueous environments due to high adsorption capacity and easily and quick separation. 相似文献
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