中苏门答腊盆地基底油气藏主控因素及勘探潜力分析

Main Factors and Exploration Potential of Basement Oil and Gas Reservoir of Central Sumatra Basin

中苏门答腊盆地基底潜山类油气藏具有较好的勘探前景。而南苏门答腊盆地基底潜山油气藏已经取得了勘探突破,在总结中苏门答腊盆地油气地质条件和对中苏门答腊盆地基底岩性、基底断裂展布及应力分析的基础上,通过类比南苏门答腊盆地基底油气藏成藏主控因素对中苏门答腊盆地基底油气藏进行分析,认为中苏门基底油气藏主控因素主要为烃源岩、基底岩性及断裂系统。中苏门答腊盆地发育良好的湖相烃源岩,基底油气藏烃源供给充足;盆地基底岩性主要为石英岩、千枚岩及火山岩,石英岩是最利于形成裂缝型储层的基底岩性;另外,剪切应力集中区是裂缝型储层发育的有利区。根据上述分析,认为Sembilan隆起东南部及Minas高地东南部(Bengkalis坳陷西南部)不仅位于剪切应力集中区,而且位于基底石英岩发育区,是最有利的基底油气藏勘探区。

The Base buried hill in the Sumatra Basin have good prospect.And the exploration breakthrough of the base buried hill oil and gas reservoirs in the Southern Sumatra basin have been made.The research on the basis of summarizing the oil and gas geologic conditions in the Sumatra Basin was conducted,the analysis of the basal lithology and analysis of main factors of basement oil and gas reservoir of Central Sumatra Basin by analogy of South Sumatra Basin basement oil and gas reservoir hydrocarbon accumulation.Main factors of basement oil and gas reservoir of Central Sumatra Basin is source rock,basement lithology and fault system.Lacustrine source rock is widely distributed in Central Sumatra Basin,hydrocarbon source for basement reservoir is adequate.Lithology of basement is mainly quartzite,phyllite and volcanic.Quartzite is the most conducive to the formation of cracks in basement lithology reservoir.Shear stress concentration area is the most favorable area for fractured reservoir development.Based on the above analysis,it was concluded that south of Sembilan lift and southwest of Minas highland is the the most favorable area for basement exploration.