下扬子地区“三气一油”钻探发现及成藏地质条件——以皖南港地1井钻探发现为例   总被引：1，自引：0，他引：1  

石刚  徐振宇  郑红军  殷启春  滕龙  周道容  方朝刚  邵威  王佳龙  黄正清 《地质通报》2019,38(9):1564-1570

下扬子地区经历了多期构造运动,地质条件复杂,对油气保存条件产生了重要影响。页岩油气具有自生自储的特性,与常规油气相比,对保存条件的要求较低,在下扬子地区具备形成页岩油气藏的潜力。通过港地1井钻探,在下扬子地区二叠系大隆组和龙潭组获得了页岩油、页岩气、煤层气和致密砂岩气"三气一油"的发现,与常规油气"上气下油"不同,港地1井油气呈现"上油下气"式非常规油气储集方式。大隆组富有机质页岩厚度约70m,地层倾角10°～20°,现场解吸获取的页岩气样品甲烷含量达80%,有机质丰度为1.9%～2.3%,平均值约2.0%,有机质成熟度(Ro)为1%～1.25%,平均值约1.2%,具备生成页岩油气的良好基础。基于港地1井的钻探发现,认为下扬子地区构造运动影响弱、盆地规模小、保存条件好的"小而整"的坳陷或盆地具备形成页岩油气藏的地质条件。  相似文献   

川南煤田龙潭组煤系泥页岩气与煤层气组合模式及合采前景分析     

尹中山  蒋琦  熊建龙  罗勇  琚宜文 《中国煤炭地质》2019,(5):30-35

文中研究的上二叠统龙潭组煤层及其顶底板泥页岩含气性特征、组合模式及合采对煤系气勘探开发意义重大。为改变煤层气产业低产低效长周期的现状,实现综合效益的目标,将龙潭组作为目标层进行研究;简述了川南煤田龙潭组含气泥页岩与煤层的组合模式,并初步探讨了上述组合模式合探合采的必要性、条件和前景,并提出了开展综合勘探开采的建议。  相似文献   

Nematode distribution in cultivated and undisturbed soils of Guinea Savannah and Semi-deciduous Forest zones of Ghana     

Obed Asiedu  Charles Kodia Kwoseh  Haddish Melakeberhan  Thomas Adjei-Gyapong 《地学前缘(英文版)》2019,10(2):381-387

Climate change affects air temperature, sea levels as well as the soil and its ecosystem. The Guinea Savannah and Semi-deciduous Forest zones of Ghana are characterized by different climatic conditions and vegetative cover. Annual average temperature has been steadily increasing whilst annual total rainfall has been decreasing in both zones, and this has been causing a southward shift of the Savannah into the Forest zone. Soil organisms provide crucial ecosystem services which are required for sustainable agriculture and food production yet crop cultivation disturbs the soil ecosystem. The harsh conditions associated with the Savannah further expose the soil ecosystem to disturbance and loss of biodiversity which threatens food production and security. Soil nematodes are the most abundant animals in the soil and play a central and critical role in the soil food web complex. Studying the nematode community structure gives a reflection of the status of the entire soil ecosystem. Soil samples were taken from cultivated and natural landscapes in the Guinea Savannah and Semi-deciduous Forest agroecological zones to analyse the nematode community. Results from the study showed the Guinea Savannah zone recording warmer soil temperatures, lower organic matter percentage and lower nematode diversity(Genus Richness) as compared to the Semi-deciduous Forest zone. If the Savannah continues to shift southward, the Forest zone soil ecosystem risks disturbance and loss of biodiversity due to the harsh Savannah conditions. Our findings indicate that prevailing crop cultivation practices also disturb soil ecosystem in the two ecological zones which span across West Africa. A disturbed soil ecosystem endangers the future of food production and food security.  相似文献   

长江经济带岩盐矿特征与盐穴储库适宜性评价     

刘红樱  姜月华  杨国强  金阳  杨辉  周权平 《中国地质调查》2019,6(5):89-98

长江经济带包括上海、江苏、浙江、安徽、江西、湖北、湖南、四川、重庆、云南和贵州11个省(直辖市),是我国重要的经济发展区域,油气资源长期安全可靠的储存对于该区经济可持续发展至关重要。基于长江经济带战略油气储库基地建设规划布局的需求,在充分收集利用前人地质调查和研究成果的基础上,对区内岩盐矿床进行了综合研究和分析,建立了层次结构模型,评价了盐穴油气储库建设的可行性。长江经济带除上海和贵州外,其余9省(直辖市)均发现了大量的岩盐矿床,主要成盐时代为震旦纪、三叠纪、白垩纪和古近纪; 成盐盆地范围0.29~10 000 km²,盐层累计厚度3~1 050 m,矿体埋藏深度40~3 400 m; 矿石中NaCl含量20%~99.86%; 矿体顶底板及夹层岩石主要为泥岩、粉砂质泥岩及泥质粉砂岩。地质调查揭示出区内大部分地下盐穴远离地震活动带,构造稳定,因此可以改造为石油储库。考虑储气库的密闭性及安全性,江苏金坛盆地等6个盐矿埋深适中,建穴地质条件较好,适合建造储气盐穴库; 江苏淮安等14个盆地的局部地区适合建造天然气储库; 重庆垫江等11个盐矿埋深较大,可以建造储气盐穴库,但建造成本较高; 湖南澧县等21个盐矿埋藏偏浅,应选择更深部的盐层空间建造油气储库。建议在江苏金坛、淮安、赵集和丰县,江西清江和会昌,湖北云应、天门小板和潜江等盐矿地区优先开发利用盐穴。  相似文献   

阿尔金山前下—中侏罗统页岩气成藏地质条件分析     

陈夷  杜治利  康志宏  田亚 《中国地质调查》2019,6(4):40-50

阿尔金山前侏罗系出露大套厚层的暗色泥页岩,生烃潜力优越,具备陆相页岩气形成条件,是有利的勘探接替区。通过野外地质调查、样品采集和测试分析,研究下—中侏罗统泥页岩的沉积展布、有机地球化学特征及储集性能,并探讨了该区页岩气的勘探潜力。研究表明: 富有机质泥页岩主要处于滨浅湖—半深湖相、沼泽相沉积环境中,其在平面上呈NE向展布,单层厚度和累计厚度均较大; 泥页岩的有机质类型主要为Ⅱ₁、Ⅱ₂型干酪根; TOC含量为0.55%~10%,平均为2.28%; 镜质体反射率(R_o)为1.0%~1.6%,平均为1.269%,处于成熟—高成熟阶段,为页岩气藏形成提供良好的生烃条件; 其矿物特征表现为脆性矿物含量高,大于51%,有利于后期的水力压裂改造和页岩气开采; 通过扫描电镜观察,泥页岩储层发育微孔隙及微裂缝,为页岩气提供了良好的储集空间和运移通道。初步预测,后期改造相对较弱的月牙山地区为页岩气勘探的有利目标区。  相似文献   

Regional gravity survey and application in oil and gas exploration in China     

《China Geology》2019,2(3):382-390

Ground gravity survey for regional structure unit delineation and oil and gas exploration in China is addressed in this paper with examples. Gravity survey scales, coverage, technical regulations and achievements at the national level are introduced, including data processing and anomaly interpretation techniques. Bouguer anomalies of terrestrial territories of China and classification of anomalous feature zones are also described; they are well correlated with lithotectonical boundaries, fault zones, and unexposed igneous plutons. Recent study results of petroliferous sedimentary basins are presented as well, including concealed boundaries and major structures of large basins. It is concluded that gravity survey is the most effective and economic method in unveiling unexposed and deep-seated structures, targeting and delineating oil and gas-bearing sedimentary basins, and locating main trap structures within prolific basins in early stage of exploration in China. Suggestions for improving exploration of both conventional and unconventional oil and gas reservoirs in China are also given in the paper.  相似文献   

A sand-production control system for gas production from clayey silt hydrate reservoirs     

《China Geology》2019,2(2):121-132

Sand production is a crucial problem during the process of extracting natural gas from hydrate reservoirs. To deal with sand-production problems systematically, a sand-production control system (SCS) is first proposed in this paper, specialized for pore-distributed clayey silt hydrate reservoirs. Secondly, a nodal system analysis method (NSAM) is applied to analyze the sand migration process during hydrate exploitation. The SCS is divided into three sub-systems, according to different sand migration mechanisms, and three key scientific problems and advances in SCS research in China Geological Survey are reviewed and analyzed. The maximum formation sanding rate, proper sand-control gravel size, and borehole blockage risk position were provided for clayey hydrate exploitation wells based on the SCS analysis. The SCS sub-systems are closely connected via bilateral coupling, and coordination of the subsystems is the basis of maintaining formation stability and prolonging the gas production cycle. Therefore, contradictory mitigation measures between sand production and operational systems should be considered preferentially. Some novel and efficient hydrate exploitation methods are needed to completely solve the contradictions caused by sand production.© 2019 China Geology Editorial Office.  相似文献   

植物挥发性有机物的初步研究   总被引：1，自引：0，他引：1  

白建辉  王明星  胡非  James P.Greenberg  Alex B.Guenther 《气候与环境研究》2003,8(2):180-187

2000年1～6月期间,美国国家大气研究中心(NCAR)和中国科学院大气物理研究所的科学家发展了一套自动的气相色谱系统和分析方法,用于分析大气中的挥发性有机物.此系统性能稳定,重复性好,对美国大气研究中心附近的大气进行了采样分析.作者简单介绍了此自动系统以及采样分析结果.  相似文献   

美国海上油气田租赁开发和环评体系研究          下载免费PDF全文

金嘉萌  黄必桂  安明明 《海洋开发与管理》2018,35(7):30-35

美国海洋油气环评贯穿于外大陆架油气区域租赁销售和开发的各个阶段。文章从美国外大陆架租赁范围界定入手,介绍油气区域租赁开发所经历的5年规划、区域销售、勘探和开发生产各阶段所涉及的环评文件类型。着重分析美国海洋油气开发环评体系、工作程序和文件内容,最后提出对我国海洋油气开发环评的启示,即:海洋油气规划环评在先;公众参与的早期介入;全过程政府环评;环评审查不等于排污许可。  相似文献   

南海北部东沙天然气水合物区浮游植物生物量和生产力粒级结构特征及其环境影响分析     

康建华  梁前勇  王建军  林毅力  何雪宝  夏真  郑新庆  王雨 《海洋学报(英文版)》2018,37(1):97-107

本文讨论了2013年5月南海东沙天然气水合物区浮游植物生物量和生产力粒级结构特征及其环境影响因素。结果表明，研究海域表现出典型的低营养盐、低叶绿素a、低生产力特征，浮游植物叶绿素a和初级生产力具有明显的次表层最大值现象。东沙海域生物量和初级生产力粒级结构差异性显著，从生物量和生产力贡献度来看，表现为微微型浮游植物> 微型浮游植物> 小型浮游植物。生物量的垂直分布结果表明，春季不同粒级类群浮游植物在真光层内的分布存在明显不同，比如小型浮游植物在真光层内分布较均匀；微型浮游植物则主要分布于近表层或真光层中部，而微微型浮游植物则主要分布于真光层中部和底部。微微型浮游植物在纬度较低的热带贫营养海区之所以能够占主导优势，最主要的原因是其极小的细胞体积和较大的表面积使其有利于营养竞争。相关性分析表明，南海东沙浮游植物各粒级生物量与温度、pH显著正相关，与硅酸盐、磷酸盐显著负相关；浮游植物各粒级生产力与温度显著正相关，与盐度、磷酸盐显著负相关。磷酸盐含量是影响东沙海域浮游植物粒级结构差异的重要因素之一，同时，光辐照度和水体的真光层深度对东沙天然气水合物区不同粒径浮游植物的垂直分布起着更为重要的调控作用。  相似文献