Barite chimneys on the Gulf of Mexico slope: Initial report on their petrography and geochemistry     

Baoshun Fu  Paul Aharon  G. R. Byerly  H. H. Roberts 《Geo-Marine Letters》1994,14(2-3):81-87

Barite chimneys associated with hydrocarbonrich fluid venting were recently documented and sampled on the Gulf of Mexico slope offshore Louisiana at 510–520 m water depth. The chimneys are dominated by barite associated with minor amounts of pyrite, iron oxide, Mg calcite, and detrital silicates. The barite displays distinct string-like and dendritic-like morphologies assembled from rosette-shaped crystals that are typically 20–40 µm in diameter. The chimneys exhibit macroscopic growth layers 1–5 mm thick, which alternate between dark gray and light yellow colors. The dark layers are dominated by string barites associated with disseminated pyrite, while the light layers are dominated by dendritic barites with little or no pyrite. The barites are anomalously enriched in Sr (average 15.5 mol% and maximum 30 mol%) and Ca (average 2.8 mol% and maximum 4.6 mol%), and exhibit rhythmic, paired, microscopic light and dark bands. The exact origin of the barites and their mode of deposition has not yet been elucidated, but they are likely to be related to the hydrocarbon-rich fluids venting on the seabed.  相似文献   

矿产的资产评估方法与矿业权流转价格、矿业税费征收标准的关系     

袁怀雨  李克庆  刘保顺 《地质与勘探》1999,35(6):9-11

论证了对矿产资源作为一种国有资产进行资产评估,评估对象应是其原有价值,即开发它的超额利润－－绝对地（矿）租和第一形态级差地（矿）租;也就是净现值。大部分应以资源税的形式收归国有;小部分可由矿产勘查、开发者分享。矿业权流转的价格应该由勘查、开发投资及其资金平均利润,中少量、合理的上述超额利润构成。现行矿业税旨收标准过高。  相似文献   

地震属性优化及其在储层预测中的应用     

高君  王建民  云美厚  黄宝顺  张国才 《应用地球物理》2006,3(4):243-247

利用地震资料属性信息预测油气储层已越来越受到石油地球物理工作者的广泛重视。但如何优化地震属性,从而更加精确地预测薄砂岩储层特征,提高其描述精度,更是地质及地球物理勘探家们始终不懈的追求。本文在借鉴主成分分析思想的基础上,提出一种新的地震属性优化方法-约束主成分分析。经理论模型的计算及油田区的实际应用表明:该方法不仅能提高储层预测的精度,而且具有更好的适用性。  相似文献