DOI: 10.1016/j.palaeo.2013.07.024
论文题名: The role of algal blooms in the formation of lacustrine petroleum source rocks - Evidence from jiyang depression, bohai gulf rift basin, eastern china
作者: Liu C. ; Wang P.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 388 起始页码: 15
结束页码: 22
语种: 英语
英文关键词: Algal bloom
; Eastern China
; Eocene-Oligocene
; Jiyang depression
; Lacustrine petroleum source rock
; Shahejie Formation
英文摘要: Algal blooms are responsible for the laminae in the lacustrine Shahejie Formation in the Jiyang depression, one of the sub-basins of the Bohai Gulf Rift Basin in eastern China. About 65 oil fields have been discovered in this depression during the past 40. years and the oil is mainly derived from three types of finely laminated lacustrine rocks of Shahejie Formation (Eocene-Oligocene). These lacustrine petroleum source rocks are oil shales, calcareous shales and calcareous laminated mudstones. Optical, SEM and BSEI analyses of these source rocks reveal that there are algal (coccoliths and dinoflagellates) laminae in the rocks. The individual algal lamina is generally composed almost wholly of one species, such as Reticulofenestra bohaiensis in coccolith laminae, and Fromea as well as Bohaidina in dinoflagellate laminae. This distribution suggests that the algal laminae formed from algal blooms in the ancient lake. Other components of source rocks included organic matter laminae, carbonate laminae and clay-rich laminae. We also discuss the sedimentation of organic matter laminae and carbonate laminae which were related to algal blooms. We conclude that the laminated lacustrine petroleum source sediment of Jiyang depression formed during episodes of algal blooms alternating with chemical and detrital sedimentation, and this represents the primary mechanism responsible for the formation of lacustrine petroleum source rocks. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69614
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Recommended Citation:
Liu C.,Wang P.. The role of algal blooms in the formation of lacustrine petroleum source rocks - Evidence from jiyang depression, bohai gulf rift basin, eastern china[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,388