The Impact of Aqueous Medium on Gas Yields and Kinetic Behaviors of Hydrogen Isotope Fractionation during Organic Matter Thermal Degradation     

LU Shuangfang  WANG Min  XUE Haitao  LI Jijun  CHEN Fangwen  XU Qingxia 《《地质学报》英文版》2011,85(6):1466-1477

In order to recognize the impact of aqueous medium on gas yields and the kinetic behaviors of hydrogen isotope fractionation during organic matter thermal degradation, the gold tube apparatus was used to conduct thermal simulation experiments by mixing the nC18 with the water of different properties and proportions. The yields of natural gas components, the relation among hydrogen isotope composition of each component and the experimental temperatures vs. heating rates have been obtained, and the results indicate that under the higher temperature conditions, the hydrous experiment has obvious impact on gas yields, such as when more water is added, higher amounts of hydrocarbon gas and H2 are yielded, and the existence of water obviously prolongs the temperature interval with the existence of heavy hydrocarbon gas. It also shows that the hydrogen isotope of hydrocarbon gas generated by the hydrous experiment is obviously lighter than that generated by the anhydrous experiment, and with the increasing amount of added water, the δD value of hydrocarbon gas gradually decreases. Compared with gas yields, the variation of δD value is more sensitive to aqueous medium in the thermal simulation experiment. However, compared with the amount of the added water, the aqueous medium property has smaller impact on the gas yields, which still shows the inherit effect on hydrogen isotope composition of aqueous medium. Through the model simulation and the isotope fractionation behavior analysis, it is validated that the hydrogen isotope fractionation process can be well described by the chemical kinetic model. The difference of reaction fraction of normal methane and D-containing methane is large, corresponding to the same activation energy. The content of normal methane is obviously higher in the part with lower activation energy, while the content of D-containing methane is higher in the part with higher activation energy. Therefore, it will result in larger hydrogen isotope fractionation amplitude, and the δD values will be more sensitive to the variation of maturity. Meanwhile, the average activation energy of methane generation from nC18 in the hydrous experiment is higher than that in the anhydrous experiment, and the greater amount of added water, the larger the average activation energy of methane generation reaction. This has laid foundation for its exploratory application in the study of gas reservoir forming history and the gas-source correlation, which indicates the research and application prospects in this orientation.  相似文献   

AVO异常分析在大杨树盆地油气勘探中的应用     

闫磊  刘招君  方石  陈永成  贾建亮 《物探化探计算技术》2011,33(4):435-439,348,349

大杨树盆地岩性复杂,储层含有大量孔隙及裂缝,但是在该区油气并没有取得重大突破,因此勘探方向成为研究区的重要问题。这里利用杨参1井测井数据计算了含气层位的阻抗,分析判断该含气层位AVO异常为第一类AVO异常。运用AVO分析软件处理杨参1井所在74号线的叠前道集资料,发现该含气层位AVO异常振幅为第一类AVO异常。运用AVO技术分析认为,杨参1井两侧存在范围较大的含气异常,而且存在含气性更好的第二类AVO异常特征。最后综合各类资料,认为74号线位于大杨树盆地南部坳陷最有利的勘探远景区,AVO异常特征段为下一步重点工作的地区,作为探井位置CDP3010附近应引起重视。  相似文献   

四川通江铁厂河长兴组生物礁～滩组合特征研究     

林杰  吴熙纯  刘树根  刘康林  李金玺 《物探化探计算技术》2011,33(3):323-330,229

通江铁厂河上二叠统长兴组生物礁是在川东北地区地表发现的生物礁的又一代表,通过野外四条剖面的测量及详细的室内研究,可以认为,该区长兴组发育有生物礁及生物碎屑浅滩组合相,圆丘状点礁与浅滩叠置构成纵向上三个旋回的礁、滩复合体。生物礁的造礁生物主要是海绵,含量为20%～50%,附礁生物主要有藻类、有孔虫、蜓类等。储层岩性主要以礁灰岩及生物屑亮晶灰岩为主,岩石白云化程度较低,孔洞较丰富,但多被方解石晶体充填。通过与普光气田地下剖面对比,该区的沉积微相、岩性特征及储层岩石类型,与普光地区有明显差异。  相似文献   

鄂尔多斯盆地古生代中央古隆起形成演化与油气勘探   总被引：2，自引：0，他引：2  

邓昆  张哨楠  周立发  刘燕 《大地构造与成矿学》2011,35(2):190-197

鄂尔多斯盆地古生代中央古隆起形成演化对该地区构造格局和油气勘探具有重要意义.通过对古生代构造背景、地层体残余厚度、奥陶系顶面构造演化等特征分析,刻画中央古隆起在不同沉积期构造演化特点,大体分为3个演化阶段:初始演化阶段:相对独立的中央古隆起形成于中晚寒武世:发育阶段:中央古隆起在早奥陶世马家沟期反映最为明显,为隆升剥蚀...  相似文献   

水库水气界面温室气体通量监测方法综述   总被引：13，自引：2，他引：11       下载免费PDF全文

赵炎  曾源  吴炳方  陈永柏  王强  袁超 《水科学进展》2011,22(1):135-146

水库水体中的有机碳,经过水中微生物代谢分解,生成甲烷、二氧化碳等温室气体,通过扩散、气泡等方式,经由水气界面排向大气.目前国外对水库水气界面的温室气体通量监测已经发展了静态箱法、梯度法、倒置漏斗法、TDLAS法以及涡度相关法等.综述了以上监测方法的原理、应用、优缺点及适用范围,从水体、陆地和气候环境方面分析了影响水气界...  相似文献   

世界水溶气资源分布、现状及问题   总被引：1，自引：0，他引：1  

周文  陈文玲  邓虎成  周秋媚 《矿物岩石》2011,31(2)

针对世界水溶气资源及国内外勘探开发现状统计结果表明,全世界水溶气资源丰富,总量达33 837×1012m3,这比常规天然气资源量(293×1012m3)高两个数量级;中国主要的含油气盆地中水溶气资源也很丰富,43个盆地的水溶气资源量的估算结果达到19×1012m3。对水溶性气藏成藏条件的分析研究认为:丰富的气源、异常高地层压力、储集层和保存条件是形成该类气藏的主要条件。根据天然气溶解的Henry经验定律、分子间隙溶解机理分析,认为溶解和脱气过程中除了考虑温度和压力变化,还存在构造震荡脱气等脱气过程。由于对不同的地层水条件下,天然气的溶解度变化的认识尚不太清晰,且富集条件及静态气藏形成条件是否能够促成动态气藏的形成,以及其他因素对气藏有何影响亦需要深入研究,对国内水溶性气藏资源需要进行系统的评价,确定气藏的有效开发技术方法,以促进水溶性天然气的勘探和开发,增加我国天然气供给的途径。  相似文献   

油气藏埋存二氧化碳生物转化甲烷的机理和应用研究进展   总被引：1，自引：0，他引：1  

魏小芳  罗一菁  刘可禹  帅燕华 《地球科学进展》2011,26(5):499-506

埋存CO<,2>生物转化CH<,4>技术是利用油、气藏中内源微生物,以埋存的CO<,2>为底物,通过CO<,2>生物还原途径合成CH<,4>的生物技术.此技术因兼备CO<,2>减排的环保意义、生物合成CH<,4>的再生能源意义、延长油气藏寿命和潜在经济收益等优势有着广泛应用前景.CO<,2>的捕集、埋存和油气藏生物多样...  相似文献   

Noble Gas Diffusion Mechanism in Lunar Soil Simulant Grains:Results from ~4He~+ Implantation and Extraction Experiments     

付晓辉  邹永廖  郑永春  贺怀宇  欧阳自远 《中国地质大学学报(英文版)》2011,(5)

Experiments on ion implantation were performed in order to better characterize diffusion of noble gases in lunar soil.4He+ at 50 keV with 5×1016 ions/cm2 was implanted into lunar simulants and crystal ilmenite.Helium in the samples was released by stepwise heating experiments.Based on the data,we calculated the helium diffusion coefficient and activation energy.Lunar simulants display similar 4He release patterns in curve shape as lunar soil,but release temperatures are a little lower.This is probably a con...  相似文献   

张掖市城市湿地土壤盐分、pH值和含水量的空间异质性分析   总被引：2，自引：0，他引：2  

秦晓燕 《地下水》2011,(1):8-11

基于区域变量化理论,运用传统统计学和地质统计学方法,以张掖市城市湿地为研究区,定量分析湿地土壤盐分、pH值和含水量的空间异质性.结果表明:土壤盐分较高,呈一定的碱化趋势;盐分属于强变异程度,pH值属于弱变异程度,含水量属于中等变异程度;根据半方差函数理论模型分析,盐分受结构性因素较大影响表现为强空间相关性,pH值受随机...  相似文献   

强度折减有限元在堤防稳定分析中的应用研究     

张芳枝  陈晓平  梁志松 《工程地质学报》2011,19(2):244-249

采用强度折减有限元法,研究非均值堤防塑性区的开展特征和失稳破坏过程,并根据堤防应力场分布和临界滑动面的形成来分析堤岸整体失稳破坏的机理.结果表明:把强度折减有限元应用到非均质土层的堤防边坡稳定分析,在理论上、数值模拟实现上都是可行的;有限元静力平衡和位移计算不收敛作为堤防边坡整体失稳的标志,同时考察滑移面上某些特征点的...  相似文献