Based on drill and seismic data, taking"environments control source rocks"as a breakthrough point, we analyzed the conditions for the formation of high-quality source rocks in North Sag in regard with the relationship between sedimentary environment and source rock development, combined with sedimentary facies, trace element characteristics and biomarker compound characteristics.At the same time, in view of the distribution and geochemical characteristics of this set of hydrocarbon source rocks, we discussed the resource potential of the Taizhou Formation source rocks of North Sag.The results show that the source rocks were developed in the deep-and semi-deep lacustrine facies under the saline water background, which is favorable for the preservation of organic matter and the formation of source rocks.The source rocks of Taizhou Formation in North Sag are widely distributed in large thickness, high organic abundance and high maturity, and have great hydrocarbon generating potential.Through basin simulation calculation, the hydrocarbon amount in North Sag is 112.18million tons;with an accumulation coefficient of 1％-5％, the resource potential of North Sag is 1.12-5.60million tons, a large amount of resources.%综合应用钻井、地震等地质资料,以"环境控源"为切入点,利用沉积环境与烃源岩发育之间的关系,结合沉积相、微量元素特征和生物标志化合物特征,论述北凹优质烃源岩形成的条件;针对泰州组这套烃源岩层,阐述其分布和地球化学特征;在此基础上,探讨了北凹泰州组烃源岩的资源潜力.研究结果表明,泰州组二段烃源岩发育于咸水背景下的深湖—半深湖沉积,有利于富氢有机质的保存,是烃源岩形成的有利环境;北凹泰州组烃源岩分布广、厚度大,有机质丰度高、类型好、成熟度高,生烃潜力巨大;根据盆地模拟,北凹生烃量112.18亿t,按照聚集系数1％～5％计算,北凹资源量为1.12～5.60亿t,资源量大.
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