共查询到19条相似文献，搜索用时 140 毫秒
1.
随着天然气水合物勘探工作的不断深入,钻井已成为勘探的必需手段。近年来,针对天然气水合物的钻探工作已在全球范围内开展,如ODP164航次、日本南海海槽的天然气水合物钻探、ODP204航次、加拿大马更些河三角洲地区、IODP311航次及印度的天然气水合物钻探,这些钻探工作都伴随着地球物理测井,不同地区的钻探由于钻探目的层的地质条件及地质任务不同,分别采用了不同的测井方法,在储层测井评价方面也使用了各种各样的手段,对天然气水合物的识别和精细评价起到了十分积极的作用。主要从测井方法与资料评价两个方面介绍天然气水合物测井领域的新进展。 相似文献
2.
IODP 311航次--Cascadia边缘天然气水合物 总被引：1，自引：0，他引：1
《海洋地质与第四纪地质》2005,25(3):82
IODP 311航次钻探天然气水合物的目的是ODP天然气水合物项目计划组提出的,它们是：●研究海洋沉积物中天然气水合物的形成;●确定天然气水合物的性质、规模、发育机制以及全球分布的储量;●调查天然气水合物从生成到储藏的运移机制和通道; 相似文献
3.
为了获得无测井或岩心资料地区天然气水合物赋存海域未固结成岩地层的体积密度,对ODP164、ODP204、IODP311航次实际钻探资料进行了分析,统计了体积密度、孔隙度、颗粒密度的分布情况及其相互关系.分析结果表明,水合物赋存的未固结成岩地层孔隙度很高,一般大于40％,在此范围内体积密度主要受到孔隙度制约,而对骨架颗粒... 相似文献
4.
以别林斯高晋海陆缘地质环境、天然气水合物存在标志如BSR为线索,认为南极半岛别林斯高晋海陆隆上快速堆积体具有天然气水合物成藏的良好环境。根据ODP太平洋钻探计划178航次的钻孔、地震剖面等数据,从沉积、气源、热流场、成藏关键时间分析研究区域含天然气水合物的成藏条件,通过研究区天然气水合物综合异常图及综合成藏系统表,预测南极半岛别林斯高晋海陆缘天然气水合物成藏区域在陆隆快速堆积体7上,研究区的天然气水合物可能成藏的区域在地层单元I和II,年龄应是全新世到上新世晚期(0～2.1Ma)。运用体积法对其天然气水合物资源量进行计算,预测资源量较大,为今后南极区域天然气水合物的调查研究提供参考。 相似文献
5.
6.
《海洋地质与第四纪地质》2007,27(3):42-42
2007年5月1日凌晨,国土资源部中国地质调查局在我国南海北部成功钻获天然气水合物实物样品。此次采样的成功,验证了我国有关基础地质工作的可靠性,证实了我国南海北部蕴藏有丰富的天然气水合物资源,使我国成为继美国、日本、印度之后第4个通过国家级研发计划采集到天然气水合物实物样品的国家,同时,也是在南海海域首次获取天然气水合物实物样品的国家,标志着我国天然气水合物调查研究水平一举步入世界先进行列。本钻探航次由中国地质调查局统一组织,广州海洋地质调查局具体实施,委托辉固国际集团公司钻探船承担。经过精心准备,圈定出2个重要… 相似文献
7.
未来善于天然气水合物循环的研究 总被引：1，自引：0，他引：1
在２０世纪６０年代，已有大量证据表明，碳以游离气、溶解气和水合物的形式存在于海洋沉积物中 ,数量巨大。在典型的温度 (洋底温度为摄氏数度 )和约５０巴 (相当水深５００ｍ或更大 )的条件下 ,如有足够的甲烷气或其它形式的气存在 ,就可形成天然气水合物。科学家估算 ,天然气水合物中的碳相当于石油、天然气和煤中的碳之两倍。大洋钻探１４６和１６４航次在俄勒冈和新泽西州大陆边缘发现和回收了水合物、流体和气以及对下部界面环境影响之证据。这样 ,对未来大洋钻探计划提出了挑战 :需要在全球海洋中广泛布置井位 ,以采集水合物样品。这… 相似文献
8.
利用地球物理方法,在钻探前对水合物赋存带进行识别和深度预测,可以为钻探井位的选取及井深的规划提供直接的数据支持.在我国南海北部二维地震数据的基础上,以速度为主要判别依据,以波阻抗反演为佐证,识别水合物赋存带的顶、底界,并以叠加速度谱为基础,预测神狐海域A测线预测井位的水合物赋存深度.在此数据的指导下,经钻探证实,该钻位... 相似文献
9.
南海陆坡天然气水合物饱和度估计 总被引：5，自引：0，他引：5
基于双相介质理论和热弹性理论,建立了沉积层纵波速度与天然气水合物饱和度、弹性性质及地层孔隙度之间的关系。通过对比饱和水的理论P波速度与实际P波速度,可以得到天然气水合物饱和度。根据ODP184航次的电阻率、声波速度、密度等测井资料以及地质资料,初步推断南海陆坡存在天然气水合物。根据声波测井的纵波速度估算出南海1146和1148井天然气水合物饱和度分别为孔隙空间的25％～30％和10％～20％,1148井个别沉积层天然气水合物饱和度可达40％～50％。沉积层的纵波速度与饱和水速度差值越大,天然气水合物饱和度越高。 相似文献
10.
稳定同位素在天然气水合物地球化学勘查中的应用简介--以"布莱克海隆"海区为例 总被引：2，自引：0，他引：2
介绍了国外在布莱克海隆（包括ODP164航次994、995、997站位）进行天然气水合物勘查过程中应用稳定同位素的研究实例；通过对这3个站位样品的甲烷、CO2、DIC（dissolved inorganic carbon)、有机碳以及自生碳酸盐的δ^13C分析，指出浅部（0－30m)甲烷和DIC的δ^13C值随深度迅速降低又迅速升高的变化可以作为天然气水合物存在的地球化学指标。994站位孔隙水δ^18O值深度从0.30‰下降到-0.37‰；氢同位素δD随深度略有下降（从11‰到-12‰），这与水合物形成时氢氧重同位素相对富集于固相有关，表明天然气水合物的存在。997站位δ^37Cl从海底沉积物表层以下30m处为接近海水的最大值0，至钻孔底746.85m处降为-3.68‰，可能也与天然气水合物的形成有关。 相似文献
11.
Shiguo Wu Xiujuan Wang How Kin Wong Guangxue Zhang 《Marine Geophysical Researches》2007,28(2):127-138
The passive northern continental margin of the South China Sea is rich in gas hydrates, as inferred from the occurrence of
bottom-simulating reflectors (BSR) and from well logging data at Ocean Drilling Program (ODP) drill sites. Nonetheless, BSRs
on new 2D multichannel seismic reflection data from the area around the Dongsha Islands (the Dongsha Rise) are not ubiquitous.
They are confined to complex diapiric structures and active fault zones located between the Dongsha Rise and the surrounding
depressions, implying that gas hydrate occurrence is likewise limited to these areas. Most of the BSRs have low amplitude
and are therefore not clearly recognizable. Acoustic impedance provides information on rock properties and has been used to
estimate gas hydrate concentration. Gas hydrate-bearing sediments have acoustic impedance that is higher than that of the
surrounding sediments devoid of hydrates. Based on well logging data, the relationship between acoustic impedance and porosity
can be obtained by a linear regression, and the degree of gas hydrate saturation can be determined using Archie’s equation.
By applying these methods to multichannel seismic data and well logging data from the northern South China Sea, the gas hydrate
concentration is found to be 3–25% of the pore space at ODP Site 1148 depending on sub-surface depth, and is estimated to
be less than values of 5% estimated along seismic profile 0101. Our results suggest that saturation of gas hydrate in the
northern South China Sea is higher than that estimated from well resistivity log data in the gas hydrate stability zone, but
that free gas is scarce beneath this zone. It is probably the scarcity of free gas that is responsible for the low amplitudes
of the BSRs. 相似文献
12.
Drilling on Hydrate Ridge, offshore Oregon, during ODP Leg 204 enabled us to investigate fabrics of gas hydrate samples in
a wide depth range of the gas hydrate stability zone (GHSZ). X-ray computerized tomographic imaging on whole-round samples,
frozen in liquid nitrogen, revealed that layered gas hydrate structures are related to variable processes occurring at different
sediment depths. Shallow gas hydrates often form layers parallel or sub-parallel to bedding and also crosscut sedimentary
strata and other gas hydrate layers, destroying the original depositional fabric. The dynamic processes interacting with this
complicated plumbing system in this shallow environment are responsible for such highly variable gas hydrate fabrics. Gas
hydrate layers deeper in the sediments are most often dipping with various angles, and are interpreted as gas hydrate precipitates
filling tectonic fractures. These originally open fractures are potential candidates for free gas transportation, and might
explain why free gas can rapidly emanate from below the bottom-simulating reflector through the GHSZ to the seafloor.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
13.
国际大洋钻探计划自１９８３年以来，已成功地实施了６６个航次的深海钻探作业，获取钻探岩芯逾１０００００ｍ。在关于大陆边缘的构造演化，海洋地壳的形成与发展，地壳流体循环和壳幔相互作用海洋沉积结构和古海洋学，地球大气圈、水圈、冰圈、生物圈的长期变化等众多研究领域取得了一系列重大科研成果。 相似文献
14.
大洋科学钻探计划是地球科学领域迄今为止历时最长、成效最大的国际科学合作计划。自1968年以来,先后经历了深海钻探计划、国际大洋钻探计划、综合大洋钻探计划和国际大洋发现计划4个阶段。进入国际大洋发现计划,IODP工作组两次发布科学框架,文章对两个科学框架进行了对比分析。大洋科学钻探的特点和发展趋势是坚持解决重大科学问题,由地球拓展到太阳系,重视技术和大数据,以及扩大社会影响和宣传。这给我国发起国际大科学计划提供了启示,一要注重科技创新,运用大数据等先进技术;二要加强科学管理,促进开放和共享;三要重视提升影响力,扩大宣传和影响。 相似文献
15.
Robert B. Hunter Timothy S. CollettRay Boswell Brian J. Anderson Scott A. DigertGordon Pospisil Richard BakerMicaela Weeks 《Marine and Petroleum Geology》2011,28(2):295-310
The Mount Elbert Gas Hydrate Stratigraphic Test Well was drilled within the Alaska North Slope (ANS) Milne Point Unit (MPU) from February 3 to 19, 2007. The well was conducted as part of a Cooperative Research Agreement (CRA) project co-sponsored since 2001 by BP Exploration (Alaska), Inc. (BPXA) and the U.S. Department of Energy (DOE) in collaboration with the U.S. Geological Survey (USGS) to help determine whether ANS gas hydrate can become a technically and commercially viable gas resource. Early in the effort, regional reservoir characterization and reservoir simulation modeling studies indicated that up to 0.34 trillion cubic meters (tcm; 12 trillion cubic feet, tcf) gas may be technically recoverable from 0.92 tcm (33 tcf) gas-in-place within the Eileen gas hydrate accumulation near industry infrastructure within ANS MPU, Prudhoe Bay Unit (PBU), and Kuparuk River Unit (KRU) areas. To further constrain these estimates and to enable the selection of a test site for further data acquisition, the USGS reprocessed and interpreted MPU 3D seismic data provided by BPXA to delineate 14 prospects containing significant highly-saturated gas hydrate-bearing sand reservoirs. The “Mount Elbert” site was selected to drill a stratigraphic test well to acquire a full suite of wireline log, core, and formation pressure test data. Drilling results and data interpretation confirmed pre-drill predictions and thus increased confidence in both the prospect interpretation methods and in the wider ANS gas hydrate resource estimates. The interpreted data from the Mount Elbert well provide insight into and reduce uncertainty of key gas hydrate-bearing reservoir properties, enable further refinement and validation of the numerical simulation of the production potential of both MPU and broader ANS gas hydrate resources, and help determine viability of potential field sites for future extended term production testing. Drilling and data acquisition operations demonstrated that gas hydrate scientific research programs can be safely, effectively, and efficiently conducted within ANS infrastructure. The program success resulted in a technical team recommendation to project management to drill and complete a long-term production test within the area of existing ANS infrastructure. If approved by stakeholders, this long-term test would build on prior arctic research efforts to better constrain the potential gas rates and volumes that could be produced from gas hydrate-bearing sand reservoirs. 相似文献
16.
M. A. Storms 《Marine Geophysical Researches》1990,12(1-2):109-130
The coring techniques and systems of the Ocean Drilling Program (ODP) were developed to satisfy a scientific need for better quality and improved recovery of oceanic core samples. Some of the ODP systems in use today evolved from refinements to earlier systems developed by the Deep Sea Drilling Project (DSDP) or were adaptions of available industry technology. Other systems were conceived and designed by DDP engineers. The evolution of these progressive scientific coring systems began with the Rotary Core Barrel (RCB) used by the DSDP and proceeded to the highly advanced Diamond Coring System (DCS) currently under development by ODP engineers. During the evolution several other key systems were developed. These included hydraulic piston coring, extended coring, pressure coring, bare rock spudding and several systems using high speed diamond coring technology. These include the positive displacement coring motor (PDCM), the Navi-drill core barrel, and a top driven diamond coring system (DCS). This article describes the evolution and conceptual design of these systems including the required bottom hole assemblies, and the sinker bar/sandline configurations.All data, text, figures, photo's etc. contained within this chapter are public domain and free from copywrite. All rights of ODP, NSF, JOI, or other private individuals to use any or all of this material in future published documents is reserved. 相似文献
17.
《Marine and Petroleum Geology》2012,29(10):1751-1767
Supplies of conventional natural gas and oil are declining fast worldwide, and therefore new, unconventional forms of energy resources are needed to meet the ever-increasing demand. Amongst the many different unconventional natural resources are gas hydrates, a solid, ice-like crystalline compound of methane and water formed under specific low temperature and high pressure conditions. Gas hydrates are believed to exist in large quantities worldwide in oceanic regions of continental margins, as well as associated with permafrost regions in the Arctic. Some studies to estimate the global abundance of gas hydrate suggest that the total volume of natural gas locked up in form of gas hydrates may exceed all known conventional natural gas reserves, although large uncertainties exist in these assessments. Gas hydrates have been intensively studied in the last two decades also due to connections between climate forcing (natural and/or anthropogenic) and the potential large volumes of methane trapped in gas hydrate accumulations. The presence of gas hydrate within unconsolidated sediments of the upper few hundred meters below seafloor may also pose a geo-hazard to conventional oil and gas production. Additionally, climate variability and associated changes in pressure-temperature regimes and thus shifts in the gas hydrate stability zone may cause the occurrence of submarine slope failures.Several large-scale national gas hydrate programs exist especially in countries such as Japan, Korea, Taiwan, China, India, and New Zealand, where large demands of energy cannot be met by domestic supplies from natural resources. The past five years have seen several dedicated deep drilling expeditions and other scientific studies conducted throughout Asia and Oceania to understand gas hydrates off India, China, and Korea. This thematic set of publications is dedicated to summarize the most recent findings and results of geo-scientific studies of gas hydrates in the marginal seas and continental margin of the Asia, and Oceania region. 相似文献
18.
Occurrence and exploration of gas hydrate in the marginal seas and continental margin of the Asia and Oceania region 总被引：5，自引：0，他引：5
Ryo Matsumoto Byong-Jae Ryu Sung-Rock Lee Saulwood Lin Shiguo Wu Kalachand Sain Ingo Pecher Michael Riedel 《Marine and Petroleum Geology》2011,28(10):1751-1767
Supplies of conventional natural gas and oil are declining fast worldwide, and therefore new, unconventional forms of energy resources are needed to meet the ever-increasing demand. Amongst the many different unconventional natural resources are gas hydrates, a solid, ice-like crystalline compound of methane and water formed under specific low temperature and high pressure conditions. Gas hydrates are believed to exist in large quantities worldwide in oceanic regions of continental margins, as well as associated with permafrost regions in the Arctic. Some studies to estimate the global abundance of gas hydrate suggest that the total volume of natural gas locked up in form of gas hydrates may exceed all known conventional natural gas reserves, although large uncertainties exist in these assessments. Gas hydrates have been intensively studied in the last two decades also due to connections between climate forcing (natural and/or anthropogenic) and the potential large volumes of methane trapped in gas hydrate accumulations. The presence of gas hydrate within unconsolidated sediments of the upper few hundred meters below seafloor may also pose a geo-hazard to conventional oil and gas production. Additionally, climate variability and associated changes in pressure-temperature regimes and thus shifts in the gas hydrate stability zone may cause the occurrence of submarine slope failures.Several large-scale national gas hydrate programs exist especially in countries such as Japan, Korea, Taiwan, China, India, and New Zealand, where large demands of energy cannot be met by domestic supplies from natural resources. The past five years have seen several dedicated deep drilling expeditions and other scientific studies conducted throughout Asia and Oceania to understand gas hydrates off India, China, and Korea. This thematic set of publications is dedicated to summarize the most recent findings and results of geo-scientific studies of gas hydrates in the marginal seas and continental margin of the Asia, and Oceania region. 相似文献
19.
21世纪的大洋钻探——IODP 总被引：1，自引：0，他引：1
人类在地球科学方面已取得了相当大的成就,但就研究范围而言,却仅仅触及了地球的表层。IODP是一项国际性的大洋钻探计划,预期将于2003年10月正式开始实施。IODP将运用新的科学方法、科技设备,使人类对大洋底乃至整个地球系统得出更深、更广的认识。简单介绍了IODP的由来、组织机构、钻井技术、前期科学目标及中国的深海研究现状,提出中国参与IODP的必要性和可行性。通过了解21世纪的IODP在研究课题及研究技术方面的最新动态,不仅有助于我国根据国际动态调整深海研究的方向,制定符合我国需求的研究计划,而且有助于我国把握参与21世纪IODP的时机和策略,迎接“海洋世纪”的挑战,从而逐步实现“从地学大国走向地学强国”的目标。 相似文献