孟加拉国孟加拉盆地油气勘探潜力分析

孟加拉国位于南亚次大陆,是该地区重要的产气区。孟加拉盆地覆盖了该国绝大多数的领土,近年该盆地勘探力度不断加大,陆续有新的发现。据现有资料分析,该盆地有两个有效的生烃灶,其中渐新统Jenam组烃源岩主要分布于东部Surma坳陷,中新统Bhuban组烃源岩成熟区主要位于Hatia坳陷北部,处于低成熟阶段,供烃有限。平面上,油气分布明显受控于这两套烃源岩和圈闭的展布;纵向上,油气主要富集于东部前渊带的中新统储层。综合分析,孟加拉国孟加拉盆地有利勘探区位于前渊带东部,中新统储层仍是下一步勘探的热点和重点。

Exploration Potential of Bengal Basin in Bangladesh

Bangladesh is located in Southern Asian subcontinent, which is an important hydrocarbon district. Most territories of the country are covered by Bengal Basin. In recent years, exploration in the basin has been rising year by year, and many new discoveries were found one after another. According to the data, Bengal Basin has two effective source rocks. The source rocks of Oligocene Jenam Formation are mainly distributed in Surma Depression, while the maturation zone of source rocks in Miocene Bhuban Formation concentrates in northern Hatia Depression. The latter one is in low mature stage and has limited hydrocarbon supply. Horizontally, oil and gas distribution is obviously affected by these two source rocks and traps; vertically, Miocene reservoir in the eastern of Foredeep Belt contains the majority of oil and gas. Comprehensive analysis showed that favorable exploration area of Bengal Basin was the eastern Foredeep Belt, and Miocene reservoir would be the hotspot and focus for next exploration.