松南长春岭背斜带油源对比与成藏控制因素分析

长春岭背斜带位于松辽盆地东南隆起区，南邻双城、北邻三肇两个生烃凹陷。为明确其油源和成藏控制因素，利用萜烷、伽马蜡烷和藿烷等生物标志物进行原油类型和油--油对比研究。结果表明长春岭背斜带和朝阳沟阶地扶余油层原油为I 类，双城凹陷原油类型为II 类。通过三环萜/五环萜与 Tm/Ts 比值对比可知，长春岭背斜带与朝阳沟阶地扶余油层原油相似，与双城凹陷的原油存在明显区别。结合烃源岩成熟度、生排烃能力和平面分布可知，长春岭背斜带的石油来自其北部的三肇凹陷青山口组一段烃源岩的可能行较大，为上生下储组合。南部双城凹陷供油少的原因是烃源岩成熟度低、排烃能力差。用泥岩压实法恢复的古构造结果表明，位于现今高部位的勘探失利井实际上处于古构造的低部位，不是主成藏期油气运聚的有利方位，因而无油气显示。生烃中心的分布、成藏期的古构造背景、近南北向展布的砂体及断层是控制本区油气富集的主要因素。

Oil source correlation and controlling factor analysis of hydrocarbon accumulation in Changchunling anticline zone in southern Songliao Basin

Changchunling anticline zone is located in the southeast uplift of Songliao Basin,adjacent to Shuangcheng and Sanzhao hydrocarbon-generation depression.In order to clear the oil source correlation and controlling factors of hydrocarbon accumulation,the authors study the crude oil type and oil-oil correlation according to the research on biomarkers(triterpane,gammacerane and hopane).The results indcate the oil of Fuyu oillayer in Changchunling and Chaoyanggou as I type,while in the Shuangcheng depression as II type.From the ratios between Tricyclic terpenes/Pentacyclic triterpenoid and Tm/Ts,it is supported that the oil in Changchunling is similar with in Chaoyanggou,and obviously different from in the Shuangcheng depreesion.Combined with the maturity of source rock,generate-discharge ability and plane distribution,it is illustrated that the oil in Changchunling anticline mainly originates from the source rock of the K1qn1 in Sanzhao depression characterized by the oil generated in top and storaged in the bottom.The reason of the poor oil came from the south part is the low maturity and the poor expulsion ability of hydrocarbon.The paleogeography reinstated by the way of mudstone compaction indicates that the wells of fall exploring in the high-order position presently located in the bottom of the paleostructure where is not the main direction of oil and gas migration.The main controlling factors for oil and gas accumulations in Changchunling anticline include the distribution of hydrocarbon-generating center,the tectonic-paleogeography background on accumulation period,the sandbody nearly south-north orientation and faults.