修回日期: 2010-08-19
网络出版日期: 2010-10-10
基金资助
国家“973”项目“南海深水盆地油气资源形成与分布基础性研究”（编号：2009CB219400）；国家自然科学基金项目“海域区古近纪典型盆地煤聚积模式及转换机制研究”（编号： 40872100）；国家科技重大专项“海洋深水区油气勘探关键技术”（编号：2008ZX05025）；国土资源部全国油气资源战略选区调查与评价项目“南海北部陆坡深水海域油气资源战略调查与评价”（编号：XQ-2004-05）；南海北部深水区天然气资源战略调查及评价项目（编号：XQ-2007-05）联合资助.
Coal Geochemistry of Qiongdongnan Basin
Revised date: 2010-08-19
Online published: 2010-10-10
琼东南盆地煤层主要分布于下渐新统崖城组，煤样的灰分含量在13.59%～58.33%之间，炭质泥岩灰分含量在56.08%～81.33%之间，煤中灰分来源于煤中的矿物质。煤样中的矿物质主要为粘土、硫化物（黄铁矿）和石英等。煤样全硫含量在1.07%～6.39%之间，大多数煤为高硫煤。煤样均为烟煤，煤样挥发份含量在17.97%～33.53%之间。煤的有机组分总量在61.7%～96.1%之间，炭质泥岩样品有机组分总量在38.5%～59.8%之间。样品的显微有机组分以镜质组为主，其含量在58.4%～98%之间；惰质组次之，含量在1.4%～3.5%之间；煤样几乎不含壳质组。煤样中微镜煤含量在46.7%～93.2%之间，炭质泥岩样品中微镜煤含量在18.2%～31.6%之间。由于煤中矿物组分、挥发份及硫分含量相对较高，该地区煤的碳含量较低，最低为25.09%，最高为65.60%，其碳含量明显低于烟煤碳含量。焦渣以粘着、弱粘性和不熔融粘结为主。煤样最大镜质组反射率在1.04%～1.23%之间，平均值为1.14%，反映了煤岩的变质程度较高，在肥煤—焦煤之间，为中等变质程度的烟煤，正处于煤化作用的第二次跃变阶段，有利于气体的大量排出，在合适的保存条件下，有利于形成煤成气田。
张功成, 李增学, 何玉平, 张厚和, 金莉, 沈怀磊, 傅宁 . 琼东南盆地煤地球化学特征[J]. 天然气地球科学, 2010 , 21(5) : 693 -699 . DOI: 10.11764/j.issn.1672-1926.2010.05.693
The coal bed of Qiongdongnan basin distributes mainly in Yacheng Formation of lower Oligocene. Ash contents of coal samples are 13.59%-58.33%, and of carbonaceous mudstone samples are 56.08%-81.33%. Minerals of the coal samples consist of clay, sulfides (pyrite) and quartz. Total sulfur contents of coal samples are 1.07%-6.39% and most of the samples are high-sulfur coal. All the coal samples are bituminous coal with 17.97%-33.53% volatile matter. Total organic contents are 61.7%-96.1% of the coal samples and 38.5%-59.8% of the carbonaceous mudstone samples. Vitrinite is the primary maceral with the content of 58.4%-98%;Inertinite accounts for 1.4%-3.5%, and almost no exinite exits. Vitrite of the coal samples is 46.7%-93.2% and of the carbonaceous mudstone samples is 18.2%-31.6%. Carbon content of the coal is lower with the minimum of 25.09% and the maximum of 65.60%, and less than that of bituminous coal because of the relative high contents of minerals, volatile matter and sulfur. The characteristics of coke button are adhesive, less adhesive and no molten coherence. Maximum vitrinite reflectance of the coal samples varies 1.04%-1.23% with the average value of 1.14%, indicating that the coal with relative high metamorphic stage between metabituminous and medium volatile bituminous coal, was bituminous of moderate metamorphic stage. The coal at the second coalification jump was good for tremendous gas expelling out, which is in favor of forming the gas reservoir of coal\|formed gas field under favorable conditions.
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