山东昌乐凹陷油页岩地球化学特征及成因探讨

doi:10.13278/j.cnki.jjuese.201503108

摘要/Abstract

摘要：

山东昌乐凹陷油页岩出产于古近系五图群李家崖组,与济阳拗陷和潍北凹陷孔二段相当。利用有机地球化学方法对昌乐凹陷油页岩品质进行分析,结果显示该区油页岩有机质丰度较高、干酪根类型主要为Ⅰ型和Ⅱ₁型,处于未熟低熟阶段,具有较好的勘探开发前景。通过区域构造演化和气候变化分析,昌乐凹陷油页岩形成于郯庐断裂带左旋右旋转换期,构造活动强度较弱加之温暖湿润的气候环境促成了油页岩的发育。油页岩与煤共生于水进体系域和高水位体系域之中,油页岩成矿模式为断陷湖沼型。

关键词: 昌乐凹陷, 油页岩, 李家崖组, 有机质, 地球化学, 成因, 山东

Abstract:

The oil shale of Changle sag exists in Lijiaya Formation of Wutu Group, corresponds to the stratum of 2nd Kongdian Formation in Jiyang depression and Weibei sag. By means of the organic geochemical theories and methods, the characteristics of oil shale in Changle sag are studied. The oil shale has a high organic matrix abundance. Its kerogen type is mainly typeⅠ and typeⅡ₁, at an immature-low maturity stage, has a strong potential for oil generation,so it has good prospects for oil and gas exploration. By analyses of the regional tectonic evolution and climate change, the oil shale of Changle sag are formated in left turn to right turn conversion period of Tanlu fault zone, weak tectonic activity coupled with warm and humid climate. The oil shale and coal co-exist in TST and HST. The oil shale metallogenic model belongs to the rift lake march type.

Key words: Changle sag, oil shale, Lijiaya Formation, organic matrix, geochemistry, genesis, Shandong Province

中图分类号:

P618.12

孙耀庭, 徐守余, 张世奇, 徐昊清, 郭丽丽. 山东昌乐凹陷油页岩地球化学特征及成因探讨[J]. 吉林大学学报(地球科学版), 2015, 45(3): 736-742.

Sun Yaoting, Xu Shouyu, Zhang Shiqi, Xu Haoqing, Guo Lili. Geochemical Characteristics and Genesis of the Oil Shale in Changle Sag,Shandong Province[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(3): 736-742.

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