论文部分内容阅读
众多地质工作者十几年的系统深入工作使吐—哈油田侏罗系的煤成烃研究取得了令人瞩目的进展。然而 ,侏罗系煤系泥岩和煤岩成烃的潜能不足以解释目前吐—哈油田的油气藏形成规模。在吐—哈盆地西部科牙依凹陷三叠系中首次发现的厚层烛藻煤 ,具有类型好、品质高、生烃潜能大的特点 ,是该盆地最好的烃源岩类型。该类煤的发现不但对评价该地区前侏罗系生油前景具有重要意义 ,而且对侏罗系煤成油类型多样化也具有启示。综合分析结果表明 ,烛藻煤既可能是台南凹陷前侏罗系油藏生烃物质之一 ,又可能对侏罗系油气藏有所贡献。在中三叠世时的科牙依凹陷和台北凹陷、早侏罗世时台北凹陷中部的丘东洼陷、早二叠世晚期的台北凹陷北部等地区均为炎热半干旱、半咸水、强还原的深湖环境 ,均可能发育丰富的烛藻煤等腐泥煤类 ,它们与湖相泥岩共同对吐—哈油田的油气藏形成提供了生烃物质。吐—哈盆地与准噶尔盆地的生烃条件十分相似。除此之外 ,幔源物质可能对吐—哈盆地的油气藏形成具有重要贡献。
The systematic and extensive work of many geological workers for more than ten years has made remarkable progress in the research on coal-forming of Jurassic coal in the Tuha-Ha oilfield. However, the potential of hydrocarbon generation from Jurassic coal series mudstones and coal rocks is not enough to explain the current scale of reservoir formation in the Tu-Ha oilfield. The thick layer of candellite coal, which was first discovered in the Triassic of the Coya Depression in western Tuotu-Ha Basin, is characterized by its good type, high quality and large hydrocarbon potential. It is the best source rock type in this basin. The discovery of this type of coal is not only of great significance for the assessment of the prospects of oil production in the former Jurassic in this region, but also of enlightenment for the diversification of oil-forming types of Jurassic coal. The comprehensive analysis shows that Anthracite coal may be one of hydrocarbon generation materials of the former Jurassic reservoirs in Tainan Sag, and may contribute to the Jurassic reservoirs. During the middle Triassic, the Coyotes depression and the Taibei depression, the Qiaodong depression in the middle of the Taipei depression in the Early Jurassic, and the northern part of the Taipei depression in the late Early Permian are hot and semi-arid, brackish water and strong reduction Deep lake environment, rich sago peat such as candellite coal may be developed. Together with the lacustrine mudstone, they provide hydrocarbon generation materials for the formation of reservoirs in the Tuha-Ha oilfield. The hydrocarbon generation conditions in the Tuoha Basin and the Junggar Basin are very similar. In addition, mantle-derived materials may contribute significantly to the formation of the reservoir in the Tu-Ha basin.