塔里木盆地牙哈油气田沥青垫特征及其成因──分布产状与宏观组成特征

CHARACTERISTICS AND ORIGIN OF TAR MATS IN YAHA OIL-GAS FIELDS,TARIM BASIN:OCCURRENCE AND MARCROSCOPIC COMPOSITIONAL FEATURES

张敏 张俊 梅博文

Zhang Min Zhang Jun Mei Bowen

利用薄层色谱-氢火焰检测技术(TLC-FID,简称薄层色谱)和岩石热解技术,在塔里木盆地牙哈油气田下第三系陆相油气藏中,发现并准确地鉴定出两层沥青垫。这些沥青垫储层岩石抽提物族组成中,沥青质的相对含量大于30%,而对应的油层中,其值不足20%,在油藏地球化学描述剖面中,沥青垫和油层之间存在着沥青质骤变之趋势,这是沥青垫判识的重要标志。

Two tar mats were firstly discovered and determined accurately in Paleogene nonmarineoil-gas pools in Yaha Oilfields,Tarim Basin, by thin layer chromatography-flame ionizationdetector (TLC-FID) and Rock Eval. The relative content of asphaltene in gross compositionof tar mat extracts is more than 30%,but the content in corresponding oil leg is less than20%. In the profile geochemical description of oil reservoirs, sudden changes in asphaltenecontents between the tar mats and oil layers could be seen. This is an important marker todetermine tar mats.

10.11743/ogg19960409