海拉尔盆地贝尔凹陷原油芳烃化合物组成和分布特征

通过色谱-质谱分析，对海拉尔盆地贝尔凹陷35个原油样品进行聚类分析，将之分成4类.Ⅰ类原油是贝尔凹陷原油主体，占分析样品的77%，特点足菲系列含量高，平均值为64.7%，三芳甾类化合物和三芴类化合物含量次之，分别为11.42%和11.81%.Ⅱ类原油为高三芳甾类原油，三芳甾类化合物占芳烃化合物的53.9%，是该类原油的主要成份，非系列化合物含量较低，为32.5%，萘系列含量和三芴化合物含量最低，分别为0.6%和3.54%.Ⅲ类原油为高菲系列和高萤蒽含量原油，菲系列为64%，萤蒽含量高达11%，是其它原油的16倍以上.Ⅳ类原油具有高萘、高三芴化合物和低菲系列化合物的特点，分别占原油芳烃馏分的30%、32%和26%，三芳甾类化合物含量低，占3.6%.这充分说明海拉尔箍地烃源岩沉积期间有不同的沉积环境，原油有不同的牛烃母质.Ⅱ类原油以藻类为主要生烃母质，Ⅲ类原油以高等植物为主，Ⅰ类原油介于Ⅱ类和Ⅲ类原油之间，为混合型生烃母质.Ⅳ原油沉积环境和前三类原油明显不同，为咸水强还原湖相沉积环境.

Composition and distribution of aromatic hydrocarbons of crude oils in the Buir Sag, Hailar Basin

Through gas chromatographic-mass spectrometric(GC-MS ) analyses, 35 crude oil samples from the Buir Sag, Hailar Basin were performed cluster analysis.The results revealed that the crude oils in the sag could be divided into four types.The type 1 oil showed the phenanthrene series being the highest and the average value being 64.7%, the triaromatic steroid and fluorene, dibenzofuran, dibenzothiophene series being higher,with an average value being 11.42% and 11.81% respectively.It was majority of the crude oils in the sag, and occupied 77% of the crude oil samples.The type II oil was high triaromatic steroid series oil.Its triaromatic ster- oid series occupied 53.9% of the aromatic hydrocarbons compound, which was primary component of this kind of oils, with lower phenanthrene series content(the average value being 32.5%), the naphthalene series and the fluorene, dibenzofuran, dibenzothiophene series being the lowest(the average value being 0.6% and 3.5% respectively).The type Ⅲ oil showed the high phenanthrene series and fluoranthene.Its phenanthrene series was 64%, and the fluoran-thene content reached 11%, which was 16 times of other oils mentioned above.The type Ⅳ oil showed the highest naphthalene series,the high fluorene, dibenzofuran,dibenzothiophene series and low phenanthrene series,with average value being 30%, 32% and 26% respectively.Its triaromatic steroid series was lower, with average value being 3.6%.This study sufficiently i1lustrated the source rocks having varied depositional environments during the rock deposition and the crude oil possessing different hydrocarbon-generating precursors.The precursors of type Ⅱ and type Ⅲ oils were algae and higher plant for chief respectively, and the precursor of type Ⅰ oil was mixed by ones of the types Ⅱ and Ⅲ.Different from the above three crude oils, the depositional environment of type Ⅳ crude oil was salty and strong reductional lacustrine.