松辽盆地扶余—长春岭地区上白垩统青山口组油页岩品质特征及意义

Oil shale characteristics of Upper Cretaceous Qiangshankou Formation in Fuyu-Changchunling area of Songliao Basin and its significance

松辽盆地扶余—长春岭地区上白垩统青山口组发育多层油页岩,油页岩颜色主要为棕褐色和灰黑色,发育水平层理和块状层理,揭示其沉积于半深湖-深湖环境。通过系统取样、测试和分析表明：研究区油页岩为中等含油率、中发热量、高灰分及低硫油页岩。总有机碳（TOC）测试结果为4.87%~19.90%,平均为7.88%,表明油页岩有机质丰度较高;通过岩石热解参数分析,研究区油页岩有机质类型以Ⅰ型为主,Ⅱ型次之;结合最大热解峰顶温度T_（max）（℃）的变化范围为437℃~449℃,指示出研究区的油页岩有机质成熟度处在未熟-低熟阶段。对研究区油页岩的厚度及含油率展布特征进行分析表明：研究区2号和3号矿层油页岩厚度最大,连续性最好,ZK0809井和ZK3201井区油页岩累计厚度较大,而SY9井区油页岩含油率最高。

Oil shale layers found in Fuyu-Changchunling area are popularly developed in the Upper Cretaceous Qingshankou Formation of Songliao Basin. Most of them present brown and dark grey color with the development of horizontal bedding and massive bedding,which indicates their semi-deep to deep lake sedimentary environment. Systemic test and analysis results show that oil shale layers here have the charactertics of moderate calorific value,high ash content and low sulfur content with medium oil yields. The TOC content is 4. 87% to 19. 90% with the average value of 7. 88%,which reflects the high organic matter content in the oil shale. The rock-eval analysisresults show that the oil shale layers are mainly dominated by type Ⅰ organic matter,and type Ⅱ organic matter dominated secondly. The T_（max） value of 437℃ to 449℃ indicates the immature to low-mature stage of the organic matter in oil shale. The distribution of thickness and oil yield of oil shale layers indicate that the 2nd and 3rd oil shale layers of the target strata both have the maximum thickness and the best continuity. Besides,the oil shale layers in boreholes ZK0809 and ZK3201 both have the relatively higher total thickness,while in the borehole SY9,the oil shale layers have the highest oil yield.