南海神狐海域天然气水合物注热降压开采数值模拟研究   总被引：2，自引：0，他引：2  

胡立堂  张可霓  高童 《现代地质》2011,25(4)

针对南海神狐海域天然气水合物成藏条件,利用pT+H软件和水平井技术对天然气水合物的注热和注热降压开采效果进行了模拟分析。重点讨论了注入热水温度为30、60、90℃时水合物饱和度以及CH4气体饱和度、CH4产气率、累积CH4产气量和产水量的变化规律,发现两种开采模式下水合物低饱和度分布范围随时间增长和温度升高而增大;CH4产气率在开采10 d内升高较快,之后逐渐减小。模拟结果表明:注热降压开采模式比单纯注热模式的效果有较大改善,而且温度对于提高CH4产气量效果不明显,但因为天然气水合物藏的低渗透性,神狐海域的天然气水合物的CH4产气量不大。研究结果可为南海神狐海域和类似地区天然气水合物开采提供参考。  相似文献   

Early Cambrian Mollusc Watsonella crosbyi: A Potential GSSP Index Fossil for the Base of the Cambrian Stage 2     

LI Guoxiang  ZHAO Xin  Alexander GUBANOV  ZHU Maoyan  NA Lin 《《地质学报》英文版》2011,85(2):309-319

The mollusc Watsonella crosbyi was studied on the basis of material from the lower Cambrian Dahai Member of the Zhujiaqing Formation in eastern Yunnan, China and the Pestrotsvet Formation of the Aldan River region in the Siberian Platform. This fossil had been excessively described under different names in the literature, such as Heraultia varensalensis Cobbold, 1935, H. sibirica Missarzhevsky, 1974, Heraultipegma yunnanensis He and Yang, 1982, H. yannanese He and Yang, 1982, Watsonella yunnanensis, W. crosbyi Grabau, 1900, etc. Taxonomic revision shows that other species are junior synonyms of W. crosbyi. Analysis of functional morphology implies that W. crosbyi may be rather a helcionelloid than a rostroconch since its univalved conch is untorted endogastric and lacks a rostrum and a true internal pegma. Replicas of the original microstructures preserved on the surfaces of phosphatic internal moulds confirm that the shell consists of two layers. The inner layer is lamello-fibrillar, and the outer layer is spherulitic prismatic. The widespread geographical occurrences in both siliciclastic and carbonate rocks of the late Terreneuvian indicate that W. crosbyi is an important index fossil for global correlations and subdivision of the Cambrian Series 1 (Terreneuvian). The first appearance datum (FAD) of W. crosbyi is suggested to be a potential GSSP (Global Boundary Stratotype Section and Point) candidate marker for defining the base of the Cambrian Stage 2.  相似文献   

Amplitude Variation with Offset Responses Modeling Study of Walkaway Vertical Seismic Profile Data at CO2 Geological Storage Site, Ketzin, Germany     

YANG Can  Sayed Hesammoddin KAZEMEINI  FAN Wenfang  Christopher JUHLIN  LIU Dameng 《《地质学报》英文版》2011,85(5):1118-1126

An important component of any CO2 sequestration project is seismic monitoring for tracking changes in subsurface physical properties, such as velocity and density. Different reservoirs have different amplitude variation with offset (AVO) responses, which can define underground conditions. In the present paper we investigate walkaway vertical seismic profile (VSP) AVO response to CO2 injection at the Ketzin site, the first European onshore CO2 sequestration pilot study dealing with research on geological storage of CO2. First, we performed rock physics analysis to evaluate the effect of injected CO2 on seismic velocity using the Biot-Gassmann equation. On the basis of this model, the seismic response for different CO2 injection saturation was studied using ray tracing modeling. We then created synthetic walkaway VSP data, which we then processed. In contrast, synthetic seismic traces were created from borehole data. Finally, we found that the amplitude of CO2 injected sand layer with different gas saturations were increased with the offset when compared with the original brine target layer. This is the typical class III AVO anomaly for gas sand layer. The AVO responses matched the synthetic seismic traces very well. Therefore, walkaway VSP AVO response can monitor CO2 distribution in the Ketzin area.  相似文献   

Data Analysis of Chang’E-1 Gamma-Ray Spectrometer and Global Distribution of U, K, and Th Elemental Abundances     

ZOU Yongliao  ZHANG Liyan  LIU Jianzhong  MU Lingli  REN Xin  ZHANG Guangliang  CHANG Jin  YAN Jun  ZHANG Nan  ZHANG Hongbo  Lü Chang  LIU Jianjun  ZUO Wei  SU Yan  WEN Weibin  BIAN Wei  WANG Min  XU Chun  LI Chunlai  OUYANG Ziyuan 《《地质学报》英文版》2011,85(6):1299-1309

Gamma-ray spectrometer (GRS) is one of the main payloads on the Chang’E-1 (CE-1) lunar probe, mainly aimed to detect the elemental abundances and distributions on the lunar surface. At 03:58 on 28 November 2007, it performed the first observation of the lunar gamma rays. As of 24 October 2008, 2105?h of effective gamma rays spectra had been acquired by CE-1 GRS, which covers the whole surface of the moon. This paper mainly describes the data processing procedures and methods of deriving the elemental abundances by using the CE-1 GRS time series corrected spectra: first, to bin data into pixels for mapping; then, to perform a background deduction of the cumulative spectra and obtain a peak area of the elements; and finally, to use the elemental abundances inversion model to produce the elemental abundances. Based on these processing methods, the global abundance maps of U, K, and Th at a 5°×5° equal-area pixel are acquired by CE-1 GRS data. The paper gives a preliminary analysis of the uncertainties of the elemental abundances  相似文献   

Theoretical Prediction of Gibbs Free Energies of Formation for Crystalline α-MOOH and α-M2O3 Based on a Linear Free-Energy Relationship     

SUN Xiaoming 《《地质学报》英文版》2011,85(3):656-660

In the present study, the modified Sverjensky–Molling equation, derived from a linear-free energy relationship, is used to predict the Gibbs free energies of formation of crystalline phases of α-MOOH (with a goethite structure) and α-M2O3 (with a hematite structure) from the known thermodynamic properties of the corresponding aqueous trivalent cations (M3+). The modified equation is expressed as ΔG0f,MVX=aMVXΔG0n,M3++bMVX+βMVXγM3+, where the coefficients aMVX, bMVX, and βMVX characterize a particular structural family of MvX (M is a trivalent cation [M3+] and X represents the remainder of the composition of solid); γ3+ is the ionic radius of trivalent cations (M3+); ΔG0f,MVX is the standard Gibbs free energy of formation of MvX; and ΔG0n,M3+ is the non-solvation energy of trivalent cations (M3+). By fitting the equation to the known experimental thermodynamic data, the coefficients for the goethite family (α-MOOH) are aMVX=0.8838, bMVX=?424.4431 (kcal/mol), and βMVX=115 (kcal/mol.?), while the coefficients for the hematite family (α-M2O3) are aMVX=1.7468, bMVX=?814.9573 (kcal/mol), and βMVX=278 (kcal/mol.?). The constrained relationship can be used to predict the standard Gibbs free energies of formation of crystalline phases and fictive phases (i.e. phases that are thermodynamically unstable and do not occur at standard conditions) within the isostructural families of goethite (α-MOOH) and hematite (α-M2O3) if the standard Gibbs free energies of formation of the trivalent cations are known.  相似文献   

P-G交汇技术在SY地区中的应用     

谢明干  胡伟光  张云海 《物探化探计算技术》2011,33(4):376-380,346

SY地区须家河组二段（下砂）储层类型复杂,各井中均见到砂层,但该砂层储集体有的为高孔隙而有的则致密,在区域平面上表现出分布不均匀的特点。对该段储层预测方法及种类也有较多,但常规叠后反演很难对其进行区分和识别。利用叠前AVO技术,建立储层段的AVO正演模型并采用相应的工作流程,然后利用P-G交汇法对砂岩储层进行解释,发现含气储层与非含气储层的P-G交汇特征不同,砂岩储层含气后则具有交汇趋势线角度增大及远离背境趋势线的特征;而砂岩非储层则相反;其次储层段的P-G交汇点所分布的象限也不相同。通过这些特征,对全区现有钻遇该储层段的钻井进行预测,预测结果和钻井气测情况相吻合,取得了如期效果。  相似文献   

自然邻点插值算法及其在二维不规则数据网格化中的应用     

张伟  覃庆炎  简兴祥 《物探化探计算技术》2011,33(3):291-295,228

由于观测数据的不足,对不规则散点数据的二维插值在地球物理中应用非常广泛。这里研究并实现了自然邻点二维插值算法,并以一个大地电磁测深反演数据为例,验证了该方法的可行性与效果。实际资料试算与成图结果表明,该方法具有精度高、插值效果好、速度快以及便于模拟地形数据等优点。  相似文献   

碳酸盐中碳、氧同位素快速制样装置研制     

李振涛  刘汉彬  金贵善  李军杰  钟芳文 《国外铀金地质》2011,(2):112-114

介绍一种碳酸盐中碳、氧同位素快速制样装置。实验证明,该装置具有真空度好、使用方便、无污染、制样效率高、成本低的优点,所生成的二氧化碳具有高纯、分析结果准确、可靠等特点,完全能满足碳酸盐中碳、氧同位素分析的制样要求。  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   

全球碳循环研究中的δ13C方法及其进展     

陈中笑  赵琦 《地球科学进展》2011,26(11):1225-1233

随着分析技术的进步,δ13C观测在全球碳循环研究中越来越受到重视。在讨论关于碳循环中δ13C的Suess效应、分布特征和同位素分馏等基本概念的基础上,结合现有的观测事实,介绍应用δ13C辨别碳的源汇问题的方法,通过比较不同KeelingPlot方法分析该方法在研究大气CO2背景特征中的意义。着重讨论δ13C在研究大气C...  相似文献