Could the conventionally known Abu Roash “G” reservoir (upper Cenomanian) be a promising active hydrocarbon source in the extreme northwestern part of Egypt? Palynofacies,palaeoenvironmental, and organic geochemical answers     

《Marine and Petroleum Geology》2016

In different areas of the Western Desert of Egypt, the Abu Roash “G” Member exhibits either a reservoir or source affinity. Thus, thirteen cutting samples covering the Abu Roash “G” Member were selected from the Nest-1A well at Matruh Basin to investigate its hydrocarbon source potential. Palynological age dating of the section that is calibrated with foraminifera and ostracodes enabled a proper identification of the “G” Member. Detailed analysis of the vertical distribution of particulate organic matter of this member shows two palynofacies types. PF-1 reflects an outer middle shelf depositional environment of prevailed reducing (suboxic-anoxic) conditions for the organic-rich shales of the lower “G” Member (samples 1–8). While, PF-2 reflects a minor regression that resulted in deposition of another organic-rich shales of the upper “G” Member (samples 9–13) in an inner middle shelf setting under the same prevailing reducing (suboxic-anoxic) conditions.Organic geochemical analysis reveals good to very good potential of the “G” Member as a hydrocarbon source rock (1.8–2.41, avg. 2.15 total organic content wt %). It also shows good to very good petroleum potential (PP: 4.8–11 , avg. 8 mg HC/g rock). Pyrolsis and palynofacies analyses show kerogen type II for the lower “G” Member (samples 1–8), which is characterized by high Hydrogen index (HI: 396 and 329 mg HC/g TOC at depths 1500 and 1560 m) and very high dominance of oil-prone material (amorphous organic matter “AOM”, marine palynomorphs, and sporomorphs) and very rare occurrence of gas-prone material (brown phytoclasts). The upper “G” Member (samples 9–13) shows kerogen type II-III, which is characterized by a lower HI value of 213 mg HC/g TOC at depth 1340 m and it contains fewer amounts of gas-prone material and relatively lower AOM and marine palynomorphs in comparison to the upper “G” Member. Maturation parameters T_max (430–433 °C), production index (PI: 0.1 mg HC/g rock), and thermal alteration index (TAI: 2+) indicate the lower “G” Member has already entered the early oil-window kitchen, and it is expected to produce oil. The upper “G” Member is expected to produce only oil with no gas shows, because it is marginally mature (T_max 426 °C, PI 0.2, TAI 2). The source potential index (SPI: 5.3 t HC/m²) of the “G” Member shows it as currently generating moderate quantities of oil in the area of Nest-1A well.Consequently, the organic-rich shales of the “G” Member are suggested here as a promising, active oil source rock in that extreme northwestern part of the Western Desert of Egypt. However, for commercial oil recovery from the Abu Roash “G” Member, it is highly recommended to explore the depocentre of Matruh Basin at about 150 km east the Nest-1A well.  相似文献   

城市居民休闲与主观幸福感研究:以广州市为例   总被引：1，自引：0，他引：1  

王心蕊  孙九霞 《地理研究》2019,38(7):1566-1580

社会经济的发展与生活方式的转变使城市居民的休闲行为面临转型,探讨当代中国城市居民的休闲与幸福感是新时代城市地理研究中的重要议题。结合休闲的时间与空间要素,构建“休闲-幸福感”理论模型,以广州市为例,在访谈和问卷调查的基础上,运用结构方程模型对城市居民休闲行为和主观幸福感进行研究。结果显示：休闲时间和休闲空间均会对城市居民的休闲参与产生正向的促进作用,但休闲时间的影响更大;休闲时间、休闲参与和休闲满意度会对主观幸福感产生显著的正向影响,其中,休闲满意度对主观幸福感的影响最大;而休闲满意度则受到休闲时间、休闲空间和休闲参与的影响;休闲参与和休闲满意度是建立休闲与幸福感内在联系的重要中介机制。  相似文献   

Ecological Carrying Capacity and Green Development in the “Belt and Road” Initiative Region     

ZHEN Lin  XU Zengrang  ZHAO Yuan  WANG Jijun  HU Yunfeng  WANG Juanle 《资源与生态学报(英文版)》2019,10(6):569-573

Since the 1970s, resource crisis, environmental pollution and ecological degradation have become prominent globally, and the limits to growth have always been an important theoretical and policy issue. The technological system of early warning and regulation based on carrying capacity evaluation has great potential in natural resource utilization, environmental management and ecosystem conservation. In this paper, the evolution of carrying capacity research and the concept of ecological carrying capacity are summarized, and the existing evaluation methods of ecological carrying capacity are classified into ecological footprint method, comprehensive index system method, ecosystem service analysis method and human appropriation of net primary productivity method. The current problems in ecological carrying capacity study were analyzed and the trend was outlooked. Combined with the special issue, the recent proceeding of ecological carrying capacity study in the Belt and Road Initiative (BRI) region was narrated, from the aspects of ecological carrying capacity evaluation method and application, the supply and consumption of ecosystem services, and the resources use and environment change. Some suggestions have been proposed to improve the accuracy and reliability of ecological carrying capacity evaluation: 1) the spatial heterogeneity and temporal dynamic change of ecological carrying capacity should be explored furtherly; 2) the interaction between ecological process and human activities should be simulated; 3) factors such as climate change, human activities and ecological products and ecological service flows should be integrated into the evaluation system of ecological carrying capacity.  相似文献   

Long-lived magmatic systems and implications on the recognition of granite–pegmatite genetic relations: Characterization of the Pavia granitic pegmatites (Ossa-Morena Zone,Portugal)     

《Chemie der Erde / Geochemistry》2014,74(4):625-639

It is generally accepted that pegmatites are derived from large masses of granite but, even in areas where complete mineralogical, chemical and isotopic datasets are available, the relation between pegmatites and host granitic rocks or nearby plutons is usually not simple to address. The Pavia pluton, located in the Ossa-Morena Zone (Iberian Massif), is a multiphase intrusive body constructed over ∼11 m.y. by the amalgamation of several batches of magma. At the first glance, pegmatites seem to constitute a very homogeneous pegmatite field. They are mainly “intragranitic” thin tabular dikes, unzoned, layered, or with simple internal structure and are composed by the ordinary minerals that constitute the different classes of igneous rocks. They also present identical whole rock major and trace elements geochemistry and isotopic signature [(⁸⁷Sr/⁸⁶Sr)_i = 0.70434–0.70581, ɛNd_t = −1.3 to −3.7 and δ¹⁸O = 8.2–9.6‰] but, based on previously published geochronological data, three generations of pegmatites were identified. Two of these are coeval with the emplacement of the host granites (s.l.) at 328 Ma and ca. 324 Ma. The other is related to a later magmatic event at 319–317 Ma. A similar and rather juvenile source is suggested for host granites (s.l.) and pegmatites but a simple and continuous process of intra-chamber magmatic differentiation is not supported by our data. It is suggested that pegmatites derived from slightly evolved batches of magma that interacted with fresh, newly emplaced, batches (from the same or from a similar source) with limited interaction with the crust. Therefore, the Pavia pegmatites do not represent the final products of magmatism at this level of the crust but slightly differentiated products of different batches of magma. This study demonstrates how long-lived magmatic systems can potentially affect the recognition of granite–pegmatite genetic relationships.  相似文献   

灌注桩后压浆技术的工程实践          下载免费PDF全文

胡胜华  张所邦  韩朝  刘宝斌  汤士博 《探矿工程》2014,41(12):71-74

钻孔灌注桩的孔底沉渣和桩侧泥皮限制了灌注桩的应用,而灌注桩后压浆技术的应用,较好地解决了这一难题。结合工程实际,叙述了后压浆技术的施工技术要点和施工控制措施,分析了影响注浆管“开塞”的因素及确保成功“开塞”的技术措施。  相似文献   

楚雄市西舍路乡“11.02”地质灾害分析     

郑世华  彭炜  王学良 《地质灾害与环境保护》2014,(2):12-15

此次发生的滑坡和泥石流灾害,造成重大人员伤亡及经济损失。从地质构造、植被、地形和诱发条件4个方面分析灾害的形成。在研究该地区此类地质灾害发生的共同规律和个性特征的基础上,提出相应的防治对策和建议,以促进楚雄市地质灾害的防灾减灾工作。  相似文献   

基于沉积成岩-储集相分析确定文昌9区低渗储层“甜点”分布   总被引：1，自引：0，他引：1  

尤丽  张迎朝  李才  张哨楠  招湛杰 《吉林大学学报(地球科学版)》2014,(5):1432-1440

文昌9区位于珠江口盆地文昌A凹陷六号断裂—珠三南断裂带之间。古近系珠海组是主要储集层系,埋深基本大于3km,为扇三角洲前缘-潮坪相沉积储层,储层物性以低渗特征为主,局部发育中渗。为扩大勘探油气储量和后期合理有效开发,"甜点"储层寻找至关重要,笔者通过常规物性、测井解释、岩石薄片分析、二维核磁共振等,认识成岩相展布与储集层厚度、物性分布,综合沉积作用、成岩作用等,精细剖析珠海组低渗成因及储集厚度与物性差异发育的主控因素。研究表明:珠海组低渗特征形成的主要原因是压实作用,水下分流河道、潮道和砂坪微相为最有利储集相带,其次为混合坪,二者均可能形成"甜点"储层;压实程度偏弱、粒度较粗、溶蚀较强或绿泥石包壳发育区为潜在的"甜点"储层发育区,可确定六号断裂—珠三南断裂带之间发育"甜点"储层;六号断裂带相近埋深,六号断裂带附近区域较远离区域更有利于"甜点"储层发育。  相似文献   

“以后”和“后来”     

周清艳  张静静 《广东海洋大学学报》2005,25(2):107-111

对“以后”和“后来”进行详细深入的对比分析。在语义上,“以后”可以表示时间和范围,“后来”只用来表示过去的时间;在句法功能上,方位词“以后”既可以单用也可以作后置成分,而时间名词“后来”常常单用,单用的“以后”和“后来”在同现副词、连词以及句式选择上都有着不同的特点。最后对留学生学习过程中出现的偏误作了简要分析。  相似文献   

空心化村庄成因及治理对策探析——以江苏省邳州市前湖村为例          下载免费PDF全文

江国逊  沈山  方雪  秦萧  孟庆华 《山东国土资源》2011,27(10):57-61

以邳州市前湖村为例,在逐户调研的基础上,分析其空心化现状,并从法律制度、政府倾向、人口结构、自然历史条件和经济条件五方面探讨村庄空心化成因,进而提出前湖村的整治模式和治理对策,以期为空心化村庄规划整治提供借鉴。  相似文献   

三江源地区气候变化及其对径流的驱动分析(英文)   总被引：6，自引：3，他引：3  

张士锋  华东  孟秀敬  张永勇 《地理学报(英文版)》2011,21(6):963-978

Based on the precipitation and temperature data of the 12 meteorological stations in the "Three-River Headwaters" region and the observed runoff data of Zhimenda in the headwater sub-region of the Yangtze River, Tangnaihai in the headwater sub-region of the Yellow River and Changdu in the headwater sub-region of the Lancang River during the period 1965-2004, this paper analyses the trends of precipitation, temperature, runoff depth and carries out significance tests by means of Mann-Kendall-Sneyers sequential trend test. Makkink model is applied to calculate the potential evaporation. The runoff model driven by precipitation and potential evaporation is developed and the influence on runoff by climate change is simulated under different scenarios. Results show that during the period 1965-2004 the temperature of the "Three-River Headwaters" region is increasing, the runoff of the three hydrological stations is decreasing and both of them had abrupt changes in 1994, while no significant trend changes happen to the precipitation. The runoff model suggests that the precipitation has a positive effect on the runoff depth, while the potential evaporation plays a negative role. The influence of the potential evaporation on the runoff depth of the Lancang River is found to be the significant in the three rivers; and that of the Yellow River is the least. The result of the scenarios analysis indicates that although the precipitation and the potential evaporation have positive and negative effects on runoff relatively, fluctuated characteristics of individual effect on the runoff depth in specific situations are represented.  相似文献