Geology of Bangladesh Gas Fields
Geology of Bangladesh Gas Fields
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孟加拉国气田地质
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
M. Husain
中科院分区：
文献类型：
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作者：
M. Khan;M. Husain
摘要所有气田都位于孟加拉国东部印多布尔曼山脉的前缘褶皱带及其附近。天然气主要赋存于背斜的顶部，砂岩储层主要为中新世。仅凭岩性标准对比孟加拉盆地阿萨姆邦至吉大港南部新近系三角洲前深层层序的传统方法是站不住脚的，这个长期存在的问题可以通过孢粉学来解决。孟加拉气田天然气同位素分析结果表明，该气田天然气来源于海相烃源岩，形成于成熟的“石油窗口”内。目前已知的地球化学资料表明，现今天然气的海相源岩为古近纪甚至更老的时代。天然气总可采储量估计为10.0万亿立方英尺。由于气田没有得到充分的勘探，储集层的真实范围不能准确地知道。这种气体基本上是甲烷，几乎不含硫，热值很高。它用于化肥和发电厂以及工业、商业和家庭部门。
Abstract All the gas fields are located in and near the frontal fold belt of the Indoburman Ranges in the eastern part of Bangladesh. The gas is confined in the crests of the anticlines and the sand reservoirs are mainly of Miocene age. The traditional method of correlation on the basis of lithological criteria alone of the Neogene deltaic foredeep sequences of the Bengal Basin from Assam to southern Chittagong Hill Tracts is untenable and this long standing problem can be resolved with the help of palynology. Results of isotope analyses of gases of Bangladesh gas fields indicate that the natural gas is derived from marine source rocks and was generated well within the “oil window” of maturation. Geochemical data known so far suggest that the marine source rocks of the present natural gas are of Paleogene or even older age. The total recoverable reserve of natural gas is estimated to be 10.0 trillion cubic feet. Since the gas fields are not adequately explored, the true extent of the reservoirs is not precisely known. The gas is essentially methane, practically sulphur free, and has a high calorific value. It is used in fertilizer and power plants as well as in industrial, commercial and domestic sectors.