Dibenzothiophene Series from the Carbonate Rocks and Their Crude Oils in Tabei and Tazhong Areas,Tarim basin
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摘要: 塔里木盆地塔北、塔中地区四口井(库南1井,轮南46井,塔中12井和塔参1井)寒武-奥陶系12个碳酸盐岩烃源岩(泥灰岩,泥质灰岩和云岩)岩芯样品抽提物芳烃组分中的二苯并噻吩类化合物组成和丰度变化特征可分为三种类型:Ⅰ二苯并噻吩、甲基二苯并噻吩型;Ⅱ二苯并噻吩、甲基二苯并噻吩、二甲基二苯并噻吩+三甲基芴混合物型;Ⅲ二苯并噻吩、甲基二苯并噻吩、二甲基二苯并噻吩和三甲基二苯并噻吩型。研究的塔北、塔中隆起11个海相油二苯并噻吩类化合物分布类型均为二苯并噻吩、甲基二苯并噻吩、二甲基二苯并噻吩和三甲基二苯并噻吩型,和海相烃源岩二苯并噻吩类化合物第Ⅲ种分布类型完全相同。据此推断:塔北隆起8个海相油可能主要来源于塔北轮南地区下奥陶统;塔中隆起3个海相油可能来源于塔中地区中-上奥陶统。Abstract: According to characteristics of compositions and abundances, the dibenzothiophene series of Cambrian and Ordovician carbonate source rocks(marls, muddy limestone and dolomites) from four wells (KN1, LN46, TZ12 and TaCl) in Tabei and Tazhong areas, Tarim basin can be divided into three different types. They are:Ⅰ dibenzothiophene, methyldibenzoth iophene type; Ⅱ dibenzothiophene, methyldibenzothiophene, dimethyldi benzothiophene+trimethylfluorene mixture type; and Ⅲ dibenzothioph ene, methyldibenzothiophene, dimethyldibenzothiophene and trimethyl dibenzothiophene type. The distribution patterns of dibenzothiophene series of eleven marine crude oil samples from Tabei and Tazhong uplifts are, without exception, dibenzothiophene, methyldibenzothiophene, dimethyldibenzothiophene and trimethyldibenzothiophene types, which are very identical to Ⅲ types of above Cambrian and Ordovician marine carbonate source rock samples. Hence, it is inferred that the eight marine crude oil samples from Tabei uplift are thought mainly to possibly derive from Lower Ordovician marine source rocks of Tabei Lunnan area, the three marine crude oil samples from Tazhong uplift possibly from Middle-Upper Ordovician marine source rocks of Tahzhong area.
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Key words:
- Tarim basin /
- carbonate rocks /
- crude oils /
- dibenzothiophene /
- oil-source rock correlation
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