SGR断层封堵性分析及断层圈闭烃柱高度估算 --以中国东部G断块为例   总被引：2，自引：0，他引：2  

肖毓祥  龚幸林  贺向阳 《海相油气地质》2005,10(4):51-58

对油气藏中的断层进行封堵或不封堵风险评价的技术中,目前以泥岩断层泥比(SGR)方法最为常用,效果也最好,主要软件有TrapTester5。应用SGR方法对一个具体地区断层的封堵性进行评价,必须用被钻井资料证实了封堵能力的油藏断层对SGR值进行标定。介绍了SGR方法的原理,并以中国东部G断块为例作了烃柱高度估算。运用TrapTester5软件可以对断层封堵性进行定量研究,能降低断层圈闭的勘探风险。  相似文献   

The comparative study of multi‐site uncertainty evaluation method based on SWAT model          下载免费PDF全文

Jing Zhang  Qiannan Li  Binbin Guo  Huili Gong 《水文研究》2015,29(13):2994-3009

With the recent development of distributed hydrological models, the use of multi‐site observed data to evaluate model performance is becoming more common. Distributed hydrological model have many advantages, and at the same time, it also faces the challenge to calibrate over‐do parameters. As a typical distributed hydrological model, problems also exist in Soil and Water Assessment Tool (SWAT) parameter calibration. In the paper, four different uncertainty approaches – Particle Swarm Optimization (PSO) techniques, Generalized Likelihood Uncertainty Estimation (GLUE), Sequential Uncertainty Fitting algorithm (SUFI‐2) and Parameter Solution (PARASOL) – are taken to a comparative study with the SWAT model applied in Peace River Basin, central Florida. In our study, the observed river discharge data used in SWAT model calibration were collected from the three gauging stations at the main tributary of the Peace River. Behind these approaches, there is a shared philosophy; all methods seek out many parameter set to fit the uncertainties due to the non‐uniqueness in model parameter evaluation. On the basis of the statistical results of four uncertainty methods, difficulty level of each method, the number of runs and theoretical basis, the reasons that affected the accuracy of simulation were analysed and compared. Furthermore, for the four uncertainty method with SWAT model in the study area, the pairwise correlation between parameters and the distributions of model fit summary statistics computed from the sampling over the behavioural parameter and the entire model calibration parameter feasible spaces were identified and examined. It provided additional insight into the relative identifiability of the four uncertainty methods Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

Controls of 234Th removal from the oligotrophic ocean by polyuronic acids and modification by microbial activity     

Chen Xu  Peter H. Santschi  Chin-Chang Hung  Saijin Zhang  Kathleen A. Schwehr  Kimberly A. Roberts  Laodong Guo  Gwo-Ching Gong  Antonietta Quigg  Richard A. Long  James L. Pinckney  Shuiwang Duan  Rainer Amon  Ching-Ling Wei 《Marine Chemistry》2011,123(1-4):111-126

To gain new insights into the variability of particulate organic carbon (POC) fluxes and to better understand the factors controlling the POC/²³⁴Th ratios in suspended and sinking particulate matter, we investigated the relationships between POC/²³⁴Th ratios and biochemical composition (uronic acids, URA; total carbohydrates, TCHO; acid polysaccharides, APS; and POC) of suspended and sinking matter from the Gulf of Mexico in 2005 and 2006. Our data show that URA/POC in sediment traps (STs), APS/POC in the suspended particles, and turnover times of particulate ²³⁴Th in the water column and those of bacteria in STs inside eddies usually increased with depth, whereas particulate POC/²³⁴Th (10–50 μm) and the sediment-trap parameters (POC flux, POC/²³⁴Th ratio, bacterial biomass, and bacterial production) decreased with depth. However, this trend was not the case for most biological parameters (e.g., phytoplankton and bacterial biomass) or for the other parameters at the edges of eddies or at coastal-upwelling sites.In general, the following relationships were observed: 1) ²³⁴Th/POC ratios in STs were correlated with APS flux, and these ratios in the 10–50 μm suspended particles also correlated with URA/POC ratios; 2) neither URA fluxes nor URA/POC ratios were significantly related to bacterial biomass; 3) the sum of two uronic acids (G2, glucuronic, and galacturonic acid, which composed most of the URA pool) was positively related to bacterial biomass; and 4) the POC/²³⁴Th ratios in intermediate-sized particles (10–50 μm) were close to those in sinking particles but much lower than those in > 50 μm particles. The results indicate that acid polysaccharides, though a minor fraction (~ 1%) of the organic carbon, act more likely as proxy compound classes that might contain the more refractory ²³⁴Th-binding biopolymer, rather than acting as the original ²³⁴Th “scavenger” compound. Moreover, these acid polysaccharides, which might first be produced by phytoplankton and then modified by bacteria, also influence the on-and-off “piggy-back” processes of organic matter and ²³⁴Th, thus causing additional variability of the POC/²³⁴Th in particles of different sizes.  相似文献   

The response of salt intrusion to changes in river discharge and tidal mixing during the dry season in the Modaomen Estuary,China     

Wenping Gong  Jian Shen 《Continental Shelf Research》2011,31(7-8):769-788

The increase of salt intrusion in recent years in the Modaomen Estuary, one of the estuaries of the Pearl River Delta in China, has threatened the freshwater supply in the surrounding regions, especially the cities of Zhongshan, Zhuhai in Guangdong Province and Macau. A numerical modeling system using nested grids was developed to investigate the salt transport mechanisms and the response of salt intrusion to changes in river discharge and tidal mixing. The steady shear transport induced by estuarine circulation reaches maximum and minimum, respectively, during neap and spring tides, while the tidal oscillatory transport shows an opposite pattern. The net transport is landward during neap tides and seaward during spring tides. The salt intrusion length responding to constant river discharges generally follows a power law of ?0.49. The dependence of salt intrusion on tidal velocity is less than that predicted by theoretical models for exchange flow dominated estuaries. The response of salt intrusion to change in tidal velocity depends largely on river discharge. When river flow increases, the impact of tidal velocity increases and the phase lag of response time decreases. The asymmetries of salt intrusion responding to increasing and decreasing river discharge (tidal velocity) are observed in the estuary.  相似文献   

Evidence of lateral asthenosphere flow beneath the South China craton driven by both Pacific plate subduction and the India–Eurasia continental collision     

Junfeng Gong  Y. John Chen 《地学学报》2014,26(1):55-63

South China Cenozoic basalts (SCCB) are regionally distributed at the south‐east coastal area and can be grouped into three zones: a western zone (>38 Ma), a central zone (17–8 Ma) and an eastern zone (<8 Ma), leaving a temporal gap at 38–17 Ma between the western and central zones. An eastward migration of the SCCB could therefore be identified by the systematic decrease in the eruption age from the western inland to the eastern coast. We propose that most SCCB were associated with the lateral asthenospheric flows moving along the lithosphere/asthenosphere boundary (LAB) beneath South China and the subsequent decompressional partial melting. The lateral asthenospheric flows had been pulled by the eastward retreat of the pan‐Pacific plate subduction before 38 Ma and have been pushed by the northward indentation of the Indian plate into the Eurasian plate since 17 Ma.  相似文献   

Rock burst and slabbing failure and its influence on TBM excavation at headrace tunnels in Jinping II hydropower station     

Q.M. Gong  L.J. Yin  S.Y. Wu  J. Zhao  Y. Ting 《Engineering Geology》2012

Two headrace tunnels and the drainage tunnel were excavated by tunnel boring machines (TBMs) in Jinping II Hydropower Station. During TBM excavation, two types of slabbing failure were encountered in these deep buried marble tunnels. One is rock bursting and the other is non-violent slabbing. In order to study the rock burst and slabbing failure, a unique true triaxial rock burst test was carried out to simulate the rock burst process with different in situ stresses. Four rock samples in different marble layers were obtained in the site, and then four experiments are conducted under the same stressed conditions as the in situ field. The rock burst process and slabbing failure phenomena of the four experiments are in good accordance with the observations of corresponding excavation site. The failure modes of slabbing and rock burst in different rock groups can be predicted based on the experiments. The influence of the slabbing and rock burst failure on TBM excavation is analyzed in depth. Non-violent slabbing is beneficial to the rock breakage process. Rock burst with violent slabbing process greatly affects the tunnel support, cutter and cutterhead damage, gripper movement and force and so on.  相似文献   

土库曼斯坦萨曼杰佩气田卡洛夫-牛津阶碳酸盐岩沉积-成岩系统   总被引：2，自引：0，他引：2  

文华国  宫博识  郑荣才  刘合年  吴蕾  陈仁金  李世临  陈守春 《吉林大学学报(地球科学版)》2012,(4):991-1002

以土库曼斯坦阿姆河盆地萨曼杰佩气田主力油、气产层卡洛夫-牛津阶碳酸盐岩为例,根据沉积相、成岩作用方式、成岩演化序列和相对应的地质作用产物特征,综合研究Fe、Mn、Sr微量元素,C、O、Sr稳定同位素,流体包裹体和阴极发光等地球化学特征反映的成岩环境和成岩流体性质。按"水文体制"将卡洛夫-牛津阶划分为不同成岩阶段的海水-淡水、压实卤水和深循环温压水3个成岩系统,认为沉积-成岩系统与储层在时空上具有良好的耦合关系,可归结为:台地边缘生物礁和浅滩相控制了储层的区域分布;早成岩阶段淡水系统溶蚀作用和压实卤水成岩系统的浅埋藏白云岩化作用是形成储层的基础;中成岩阶段的温压水成岩系统埋藏溶蚀作用、中-深埋藏白云石化作用和构造破裂作用扩大了储层规模,提高了储层质量,对优质储层发育贡献最大。  相似文献   

四川盆地雷口坡末期古岩溶特征及其对储层的影响——以龙岗地区雷口坡组四~3段为例     

辛勇光  谷明峰  周进高  倪超  宫清顺  王小芳  吕玉珍  郝毅 《海相油气地质》2012,17(1):73-78

四川盆地龙岗地区中三叠统雷口坡组顶部雷四3段发育一套风化壳岩溶型白云岩储层。储层似层状成规模分布。古岩溶作用以表生裸露期风化壳岩溶作用为主,受古地质背景和风化壳岩性组合影响,古岩溶特征主要表现为:溶蚀时间较短,溶蚀作用较弱,充填作用及膏溶作用较强。在研究区内风化壳岩溶作用是影响储层发育的关键因素,它对储层既有建设性作用又有破坏性作用。  相似文献   

南海北部边缘盆地氮气气源追踪与判识     

何家雄  颜文  崔洁  马文宏  祝有海  龚晓峰  张景茹 《海相油气地质》2012,(3):67-71

南海北部边缘盆地油气勘探中陆续发现较丰富的二氧化碳(CO2)和氮气(N2)等非烃气气藏,同时亦发现了一些含N2、富N2的天然气层。这些CO2和N2非烃气主要富集于西北部边缘莺歌海盆地中央泥底辟带新近系及第四系浅层中。根据N2地质地球化学特征,可将本区N2划分为大气成因、壳源型有机成因和壳源型有机-无机混合成因三种主要成因类型。结合温压双控热模拟岩石产氮气实验结果,以及N2等非烃气在平面上分区分块、剖面上分带分层的局部性富集特点,追踪判识并确定N2气源主要由来自不同成熟演化阶段的中新统及上新统海相泥岩气源岩的N2与多种物理化学和岩石脱气作用所形成的无机N2相互混合而构成。  相似文献   

Microbial alteration of natural gas in Xinglongtai field of the Bohai Bay Basin, China   总被引：1，自引：0，他引：1  

Weiwei Yang  Guangdi Liu  Yaojin Gong  Yuan Feng 《中国地球化学学报》2012,31(1):55-63

Xinglongtai field has been an important petroleum-producing area of Liaohe Depression for 30 years. Oil exploration and production were the focus of this field, but the gas was ignored. This study examined twenty five gas samples with the purpose of determining the gas genetic types and their geochemical characteristics. Molecular components, stable carbon isotopic compositions and light hydrocarbons were also measured, and they proved that microbial activity has attacked some of the gas components which resulted in unusual carbon isotopic distributions. Propane seems to be selectively attacked during the initial stage of microbial alteration, with abnormally lower con-tent compared to that of butane as well as anomalously heavy carbon isotope. As a consequence, the carbon isotopic distribution among the gas components is partially reverse, as δ13C1<δ13C2<δ13C3>δ13C4. Besides, n-alkanes of C3+ gas components are preferentially attacked during the process of microbial alteration. This is manifested that n-alkanes are more enriched in 13C than corresponding iso-alkanes. As a result, the concentrations of n-alkanes be-come very low, which may be misleading in indentifying the gas genetic types. As to four gas samples, light hydro-carbon compositions display evidence for microbial alteration. The sequence of hexane isomers varies obviously with high content of 2,3-DMC4, which indicates that they have been in the fourth level of extensively bacterial al-teration. So the geochemical characteristics can be affected by microbial alteration, and recognition of microbial alteration in gas accumulations is very important for interpreting the natural gas genetic types.  相似文献