摘要
昂达尔错白云岩古油藏位于羌塘盆地南羌塘坳陷,是羌塘盆地规模最大的古油藏带,对该区油气勘探具有重要意义。依据铸体薄片、储层物性、沥青族组分分析,剖析了白云岩古油藏地质特征。分析结果表明,昂达尔错古油藏的储集体可归类为低孔—低渗型到中孔—中渗型储层,为较好储层类型;其石油族组分呈现饱和烃含量低、非烃+沥青质含量高的特征,为芳香沥青型、芳香环烷型石油。划分出两套生储盖组合,其中的下侏罗统曲色组—中侏罗统布曲组组合为较好的生储盖组合类型,具有较好的勘探远景。认为古油藏在晚侏罗世成藏,在喜马拉雅期遭受逆冲破坏。
A n g d a r c o Jurassic dolostone paleo-reservoirs located at A n g d a r c o in Southern Qiangtang Depression arethe largest oil reservoir belt in Qiangtang Basin, whi c h is significant in Tibet's petroleum exploration. It is s h o w nthat the A n g d a r c o paleo-reservoirs can be classified as the ones with low porosity an d low permeability to m e d i u mporosity and m e d i u m permeability, which belong to g o o d reservoirs. T h e group c o mponents in oil are characterizedby low content of saturated hydrocarbon but high content of non hydrocarbon a nd asphaltene, which is inclined toaromatic-asphaltic oil and aromatic-naphthenic oil. T w o source-reservoir-cap assemblages are divided into. O n e ofthem, the ^_2 B u q u - Q u s e assemblage, is regarded as being of g o o d potential. It is concluded that the paleo-reservoirbelt is the residual anticline in w h i c h hydrocarbon had been accumulated during late Jurassic period and w a sd a m a g e d during Himalayan orogeny b y thrusting.
作者
彭清华
杜佰伟
谢尚克
郑博
Peng Qinghua;Du Baiwei;Xie Shangke;Zheng Bo
出处
《海相油气地质》
CSCD
北大核心
2016年第3期48-54,共7页
Marine Origin Petroleum Geology
基金
国家油气重大专项"青藏地区海相碳酸盐岩成藏条件与有利勘探区带评价"(项目编号:2011ZX05004)和"青藏高原非常规油气调查"(项目编号:1212011221106)资助
关键词
羌塘盆地
侏罗纪
古油藏
石油地质特征
油气成藏
生储盖组合
Jurassic
Paleo-reservoir
Petroleum geological characteristics
Hydrocarbon accumulation
Source - reservoir-cap assemblage
Qiangtang Basin
