UK data and analysis for shale gas prospectivity
UK data and analysis for shale gas prospectivity
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英国页岩气前景数据和分析
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
G. Williams
中科院分区：
文献类型：
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作者：
N. Smith;P. Turner;G. Williams
摘要富含有机质的页岩中含有大量的天然气，这些天然气存在于裂缝和微孔中，并吸附在有机质上。在美国，从区域广泛的单元（如巴内特页岩）中提取的页岩气目前占天然气产量的6%，到2015年可能达到30%。页岩气的勘探前景取决于页岩中有机质的数量和类型、热成熟度、埋藏史、微孔隙度以及裂缝的间距和方向。潜在目标的年龄范围从寒武纪到晚侏罗世，在英国主要的富含有机物的黑色页岩中：年轻的页岩被排除在外，因为它们还没有达到天然气窗口，但它们可能拥有生物成因的天然气。一个地理信息系统，显示潜在的储层单元的分布，已经创建了结合信息的碳氢化合物显示，热成熟度，断裂方向，气体成分，和同位素数据，以确定潜在的页岩气的远景区。其中一些数据以图表和地图的形式显示，但由于早期勘探集中在常规油藏，因此缺乏关键数据。远景包括米德兰微克拉通上的下古生代页岩盆地（风险很高，因为在这个区块中没有常规天然气被证实），本宁盆地的密西西比页岩（与常规油田和高成熟度相关的最佳前景），埃克塞特莫尔和诺森伯兰盆地系统中的宾夕法尼亚页岩（高风险，因为没有常规天然气发现）和韦塞克斯和威尔德盆地的侏罗纪页岩（小型常规油田意味着潜力）。
Abstract Organic-rich shale contains significant amounts of gas held within fractures and micropores and adsorbed onto organic matter. In the USA shale gas extracted from regionally extensive units such as the Barnett Shale currently accounts for 6% of gas production and is likely to reach 30% by 2015. Shale gas prospectivity is controlled by the amount and type of organic matter held in the shale, its thermal maturity, burial history, microporosity and fracture spacing and orientation. Potential targets range in age from Cambrian to the late Jurassic, within the main UK organic-rich black shales: younger shales have been excluded because they have not reached the gas window, but they may possess a biogenic gas play. A geographic information system, showing the distribution of potential reservoir units, has been created combining information on hydrocarbon shows, thermal maturity, fracture orientation, gas composition, and isotope data to identify potentially prospective areas for shale gas. Some of these data are shown as graphs and maps, but crucial data is lacking because earlier exploration concentrated on conventional reservoirs. The prospects include Lower Palaeozoic shale basins on the Midland Microcraton (a high risk because no conventional gas has been proved in this play), Mississippian shales in the Pennine Basin (the best prospect associated with conventional fields and high maturity), Pennsylvanian shales in the Stainmore and Northumberland Basin system (high risk because no conventional gas discoveries exist) and Jurassic shales in Wessex and Weald basins (small conventional fields signify potential here).