GEOCHEMISTRY OF LIGHT HYDROCARBONS AND DIAMONDOIDS AND SOURCE ANALYSIS OF OIL FROM TC1 WELL IN TUQUAN BASIN
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摘要: 采用全烃气相色谱、全油气相色谱-质谱技术，研究了突泉盆地突参1井原油的轻烃和金刚烷类化合物特征，剖析其母质类型、沉积环境、成熟度等方面的信息及地质地球化学意义.突参1井原油Pr/Ph=3.17，姥鲛烷优势明显，指示为偏氧化的沉积环境；甲基环己烷指数MCH为46%，环己烷指数CH为25%，3，4DMD在二甲基金刚烷类化合物中占据一定的优势，其相对含量为48%，根据图版所示揭示其母质类型为Ⅱ2-Ⅲ型；正庚烷指数（IH）为27.6%，异庚烷指数（Ⅱ）为0.33，甲基单金刚烷成熟度指数（IMA）为0.63，二甲基双金刚烷成熟度指数（IMD）为0.38，经公式计算Ro约为1.2%，属于成熟-高成熟阶段.结合前人研究资料，认为突参1井原油来自于中侏罗统万宝组煤系泥岩.Abstract: The techniques of gas chromatography(GC) and gas chromatography-mass spectrometry(GC-MS) are adopted to study the characteristics of light hydrocarbon and diamondoids from TC1 well in Tuquan Basin, which can help reveal the parent material type, depositional environment, maturity and other geochemical and geological information of crude oil. The obvious superiority of pristane content to phytane (Pr/Ph=3.17) of the oil from TC1 well indicates that the source rock was deposited in a relatively oxidizing environment. The discrimination diagram shows that the parent material belongs to Ⅱ2-Ⅲ type, with methyl cyclohexane (MCH) index of 46%, cyclohexane (CH) index of 25% and predominant 3,4-DMD relative amount of 48% in 2 methyl adamantane. With the data of heptane(IH) index(27.6%), isoheptane(Ⅱ) index(33%), IMA (0.63) and IMD (0.38), the Ro value can be calculated to be 1.2%, revealing that the oil is in mature-highly mature stage. Combined with the previous research data, the crude oil from TC1 well is deduced to generate in the mudstone of Middle Jurassic Wanbao Formation.
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Key words:
- light hydrocarbon /
- diamondoids /
- geochemistry /
- TC1 well /
- Tuquan Basin
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