羌塘盆地昂达尔错白云岩古油藏地质特征及成藏条件

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。

Geological Characterist ics an d Hydrocarbon Accumulation of Angdarco Jurassic Dolostone Paleo- reservoirs in Qiangtang Basi n,Tibet

Angdarco Jurassic dolostone paleo-reservoirs located at Angdarco in Southern Qiangtang Depression are the largest oil reservoir belt in Qiangtang Basin, which is significant in Tibet's petroleum exploration. It is shown that the Angdarco paleo-reservoirs can be classified as the ones with low porosity and low permeability to medium porosity and medium permeability, which belong to good reservoirs. The group components in oil are characterized by low content of saturated hydrocarbon but high content of nonhydrocarbon and asphaltene, which is inclined to aromatic-asphaltic oil and aromatic-naphthenic oil. Two source-reservoir-cap assemblages are divided into. One of them, the J1-2 Buqu-Quse assemblage, is regarded as being of good potential. It is concluded that the paleo-reservoir belt is the residual anticline in which hydrocarbon had been accumulated during late Jurassic period and was damaged during Himalayan orogeny by thrusting.