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伦坡拉盆地是西藏地区唯一获工业性油气流的盆地,油气勘探前景广阔,但其勘探和研究程度均较低,对古近系牛堡组烃源岩的发育状况认识不清,制约了盆地油气资源潜力评价和勘探选区.通过研究钻井、测井及相关化验测试等资料,利用测井多参数回归和盆地数值模拟等方法技术,分析了牛堡组主要亚段有机质丰度、类型及其展布等特征,模拟重建了烃源岩的热成熟演化历史,实现了对伦坡拉盆地牛堡组烃源岩的早期综合评价.研究表明:伦坡拉盆地古近系牛堡组烃源岩发育,并以牛二段中亚段分布最广、厚度最大,在蒋日阿错凹陷最厚在400m以上,其中优质烃源岩(TOC>1.0%)最厚可达170m;牛堡组总体上属较好级别的烃源岩,其中牛二段上亚段较好-优质烃源岩所占比例最高,牛二段中亚段次之;牛堡组烃源岩有机质类型以Ⅰ型和Ⅱ_1为主;有机质成熟度总体呈中西部高、东部低的趋势,牛二段中亚段烃源岩现今多处于中-晚期生油阶段,牛二段上亚段和牛三段下亚段烃源岩现今多处于早期生油阶段.牛二段中亚段烃源岩为伦坡拉盆地主力烃源岩,蒋日阿错凹陷为最重要的生烃凹陷.
The Lunpola Basin is the only basin in Tibet with industrial oil and gas flow. The oil and gas exploration prospect is broad, but its exploration and research level are relatively low. The understanding of the development status of source rocks in the Niubebao Formation in the Paleogene is restricted Basin oil and gas resources potential evaluation and prospecting constituency.By studying drilling, logging and related laboratory tests and other data, using well log multi-parameter regression and basin numerical simulation techniques, the analysis of the main sub-section of the Niubao formation organic matter abundance, type and The results show that the evolution of thermal maturation history of source rocks has been simulated and the comprehensive evaluation of Niubebao formation source rock has been achieved in the early stage of the Lunpola Basin.The study shows that: The source rock is developed and the most widely distributed in the Middle Section of Niu Sec. The thickness is the largest. The thickest is over 400 m in the Jiangzhong-Ao Sag, of which the best source rock (TOC> 1.0%) is thickest up to 170 m. Generally speaking, the source rocks belong to the better class. Among them, the Upper Member of Niu Sec is better - the source of high quality source rock is the highest, Type and Ⅱ_1 dominated; the maturity of organic matter in the central and western high, the eastern part Nowadays, the source rocks of the Middle Member of the Niu Sec section are mostly in the middle-late stage of oil generation. Nowadays, the source rocks of the Upper Member of the Niu Sec and the Lower Member of the Niu Member are mostly in the early stage of oil production. The sub-source rock is the main source rock in Lunpola Basin, and the Jiangri-A fault depression is the most important hydrocarbon-generating depression.