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博尔塔拉盆地是准噶尔盆地西缘外围的中小型盆地,1992年在这个盆地中首次发现了油浸碎屑岩。本文从地层、构造与油浸碎屑岩的地球化学特征等方面指出了盆地可能存在油气远景。对油浸碎屑岩的实验研究表明:抽提物中含有丰富的生物标志物;有机质母质来源为混合源,既有高等植物输入,也有藻类输入,油源为海相和陆相生油层;有机质成熟度一般,非高成熟度油。盆地地质研究表明:生油层为侏罗纪、二叠纪陆相地层和石炭纪海相地层,储层丰富,除中上侏罗统和新生界可作为盖层外,阿拉套山推覆体可能是博尔塔拉原形盆地油气的良好盖层,具备生储盖组合条件。
The Bortala Basin is a small and medium-sized basin outside the western margin of the Junggar Basin. In 1992, the first oil-bearing clastic rocks were discovered in this basin. This paper points out the potential of oil and gas in the basin from aspects of stratigraphy, tectonics and geochemical characteristics of oil clastic rocks. The experimental study on the oil-bearing clastic rocks shows that the extract contains abundant biomarkers; the source of the organic matter is a mixed source, which includes not only higher plants but also algae; the oil source is marine and continental oil; the organic matter General maturity, non-high maturity oil. The basin geological study shows that the oil reservoirs are Jurassic, Permian continental facies and Carboniferous marine strata, and the reservoirs are abundant. Except that Middle-Upper Jurassic and Cenozoic can serve as cap rocks, the Alatau nappe It may be a good cap rock for oil and gas in the Bortala prototype basin with the combination of reservoir-cap conditions.