高精度GPS水准高程求解算法研究   总被引：5，自引：1，他引：5  

赵建虎  张红梅 《测绘信息与工程》2001,(3):27-29,37

为了改善GPS大地高向正常高转换的精度和计算速度，坐标转换、顾及非格网数据考虑地形改正的几何方法和龙贝格加速积分法被采用，实践验证，该方法是正确的。  相似文献   

辽河盆地桃园-荣兴屯地区煤和炭质泥岩成烃模拟   总被引：1，自引：0，他引：1  

何光玉  陈荣书  张家骅  张卫华  吴泽坚  吴铁生  张占文  陈振岩  李军生 《吉林大学学报(地球科学版)》1997,(4)

在考虑剥蚀作用与火成岩影响的基础上分别进行了地史和成熟史恢复，根据工区热模拟资料建立了炭质泥岩成烃模式，在分析国内有关煤成烃热模拟实验资料的基础上，建立了工区下第三系煤成烃模式，进而对目的层进行了生烃史模拟。结果表明，这种方法是准确而可靠的。  相似文献   

烃源岩中矿物沥青基质成烃潜力探讨   总被引：4，自引：1，他引：4  

陈建平  黄第藩 《地球化学》1997,26(6):18-24

烃源岩中存在大量矿物沥青基质，目前对其成烃潜力知之甚少。本文以酒东盆地侏罗系和白垩系烃源岩为例，从矿物沥青基质与有机显微组分，无机矿物、有机质丰度、有机质类型，有机质成熟度的关系及其荧光变化特点探讨其组成及成烃潜力，结果表明，矿物沥青基质中有机质含量低，且以次生有机质为主，原生有机质含量较少，成烃潜力有限。  相似文献   

广西金牙金矿床中饱和烃丰度分布特征及其意义   总被引：2，自引：0，他引：2       下载免费PDF全文

肖建新  张爱云 《地球科学》1997,22(2):177-180

对广西金牙金矿床的可溶有机质族组成和气相色谱分析表明，矿体饱和烃的丰度低于围岩，矿体与围岩总抽提物所气相色谱图亦明显不同，尤其是甲醇－丙酮－苯抽提物的区别更明显，矿体与围岩饱和烃丰度的差异为分析有机质在金矿形成过程中的作用提供了线索，对其意义进行了讨论。  相似文献   

应重视选用芳烃演化参数评价高演化碳酸盐岩     

高志龙 《海相油气地质》1997,2(1):11-14

现被广泛应用的测定高演化碳酸盐岩成熟度指标的多项有机岩石学评价方法，各有其不同的局限性，应用效果并不理想。研究发现，可利用芳烃演化新参数来代替其它失效的分子参数来评价碳酸盐岩有机质。芳烃因其结构、组成的特殊性和稳定性，在高演化阶段与油气生成及煤源岩成熟度有着良好的相关性，具有成为高演化碳酸盐岩成熟度指标的基础。从生产实践的角度看，芳烃演化参数有特殊适用性及选取的可行性。  相似文献   

灵武煤田延安组不同沉积相源岩的生烃潜力     

初志民  张爱云 《煤田地质与勘探》1997,25(2):25-27

为研究不同沉积相源岩的生烃能力，选择宁夏灵武煤田延安组的对象，对其湖泊三角洲沉积体系下不同沉积相源岩进行热解分析，划分其生油岩类型或有机质类型，分析了不同沉积相源岩的生烃潜力。  相似文献   

Uncertainty analysis and the relative contributions of geological factors for the Qingshankou source rocks in the North Songliao Basin, northeastern China     

Xiongqi Pang  Zhangming Chen  Ian Lerche 《Natural Resources Research》1997,6(4):263-271

Source rock evaluation is a critical factor in resource assessment of oil and gas. Models for evaluating source rocks are dependent on established geomathematical principles, the calculation of source-rock parameters, and geological data. The sensitivities and uncertainties associated with these models are a matter of concern. In this paper, the effects and relative contributions of 13 major geological factors, as well as their variations and distribution probabilities, have been analyzed for the source rocks in the North Songliao Basin in northeastern China. The geological factors include the time of formation of the regional caprock, composition of the regional caprock, the phases of hydrocarbons in migration, and those factors associated with the generation, retention, and expulsion of hydrocarbons and their effects on source-rock efficiency. Of the 13 factors analyzed, the most important are the source-rock depth, sedimentation rate, total organic content, and kerogen-type index; the relative contributions to the uncertainty of efficient gas/oil migration amounts for the most important factors are 37, 25, 19, and 1% for oil and 32, 17, 20, and 15% for gas, respectively. These most reflect the changes that have occurred in the Qingshankou source rocks.  相似文献   

GPS网正常高求解方法的研究     

兰虎彪  王昆杰 《武汉大学学报(信息科学版)》1992,(3)

本文针对几何方法在山区存在的局限性,提出了一种考虑地形起伏影响的几何方法。试验结果表明,在山区应用该方法可以获得与平原地区精度相当的高程异常。文中推导了GPS网正常高求解的数学模型,并分析了正常高求解结果的精度。  相似文献   

Geochemistry of shallow sediments in Guaymas Basin, gulf of California: hydrothermal gas and oil migration and effects of mineralogy     

B.R.T. Simoneit  R.N. Leif  A.A. Sturz  A.E. Sturdivant  J.M. Gieskes 《Organic Geochemistry》1992,18(6)

Offset of prograde hydrothermal alterations by retrograde reactions is evident in sediments from a piston core (PC6, 8 m long) from the Guaymas Basin, Gulf of California. Geochemical and mineralogical analyses of sediments and pore fluids show superimposed geochemical signals that indicate currently active reactions are modifying previously formed secondary solids. Hydrothermal barite was formed in a previously active flow channel between 150 and 250 cm depth. Hydrothermal gypsum is presently dissolving at depths > 780 cm, below which hydrothermal fluid flow is channeled by a secondary dolomite layer. Thermal stress of organic matter generates hydrothermal gas and petroleum having wide ranges of compositions and maturities. A significant amount of hydrothermally generated oil has been transported laterally through a porous debris flow (approx. 240 cm subbottom), overwhelming the indigenous bituminous matter. Water soluble petroleum constituents have disseminated throughout the cored sediments. From 400 to 700 cm depth the immature organic matter continues to experience thermally-enhanced diagenesis, and an even higher thermal stress has occurred at the bottom of the core. Enhanced bacterial degradation of organic matter has led to depletion of pore water sulfate and enrichment of ammonium (NH₄⁺) in both pore fluid and sediment, resulting in formation of NH₄⁺ bearing secondary clay minerals at depths below 780 cm.  相似文献   

冠层内动量和物质吸收特征的数值研究     

雷孝恩  张时禹 《大气科学》1992,16(2):228-236

本文设计了一冠层(CL)和大气边界层(ABL)之间物质和动量交换的耦合模式,并对CL内风速、物质随高度分布和日变化作了数值模拟.结果表明,由大尺度扩散引起冠层低层的第二个风速极大和多极值的浓度分布,CL内湍流通量和物质浓度随高度减小而迅速降低,以及CL动量减小对浓度分布的重要影响,模式都能很好地描述,模拟结果与观测事实有好的一致性.利用浓度和温度廓线相似假设,导出了质量汇的经验关系.  相似文献