耿名扬,刘志峰,吴斌
GENG Mingyang,LIU Zhifeng,WU Bin

• 1:中海油研究总院有限责任公司

摘要(Abstract)：

秦南凹陷沙河街组发育优质烃源岩，恢复烃源岩沉积环境对确定烃源岩发育模式、刻画烃源岩非均质性具有重要意义。通过古生物、常量和微量元素等资料，恢复了秦南凹陷沙河街组沉积组时期的沉积环境，明确了其烃源岩发育模式。结果表明：沙河街组三段（沙三段）沉积时期，古气候相对温暖湿润，水体为淡水-微咸水，平均水深为28.46 m；沙河街组一、二段（沙一、二段）沉积时期，古气候干旱炎热，水体为微咸水-半咸水，平均水深为13.03 m；沙三段和沙一、二段湖盆水体均发育还原-强还原环境，但沙三段湖盆古生产力高，为富养湖，沙一、二段湖盆古生产力较高，为中养湖；沙三段烃源岩受温暖湿润气候、高古生产力、深水强还原环境控制，沙一、二段烃源岩受干旱炎热气候、较高古生产力、咸水强还原环境控制。研究结果可以为秦南凹陷资源潜力评价和勘探目标优选提供指导。
High quality source rock is developed in Shahejie Formation of Qinnan Sag, and sedimentary environment restoration of source rock is of great significance to determine the development pattern of source rock and characterize the heterogeneity of source rock. Based on data of paleontology, major and trace elements, the sedimentary environment of Shahejie Formation is restored, and the development pattern of source rock is defined. The results show that paleoclimate was relatively warm and humid during sedimentary period of the third member of Shahejie Formation, and water body was fresh to brackish water with average depth of 28.46 m. During sedimentary period of the first and second member of Shahejie Formation, paleoclimate was dry and hot, and water body was brackish to semi-saline water with average depth of 13.03 m. Water body of Shahejie Formation all develop a reduction to strong reduction environment. The productivity of the third member of Shahejie Formation is high, and the lake basin is eutrophic lake, while the productivity of the first and second member of Shahejie Formation is relatively high, and the lake is moderately eutrophic lake. Source rock in the third member of Shahejie Formation is controlled by warm and humid climate, high paleoproductivity and deep water with strong reducing environment, while the source rock in the first and second member of Shahejie Formation is controlled by dry and hot climate, high productivity and saline water and with strong reduction environment. The research provides guidance for resource potential evaluation and exploration target optimization in Qinnan Sag.

关键词(KeyWords)： 秦南凹陷;沙河街组;烃源岩;沉积环境;发育模式
Qinnan Sag;Shahejie Formation;source rock;sedimentary environment;development pattern

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“中国近海富烃凹陷优选与有利勘探方向预测”（2016ZX05024-002）;; 中国海洋石油集团有限公司重大课题“中国近海盆地潜在富油凹陷资源潜力、成藏机制与突破方向”（2021-KT-YXKY-03）

作者(Author): 耿名扬,刘志峰,吴斌
GENG Mingyang,LIU Zhifeng,WU Bin

DOI: 10.19597/J.ISSN.1000-3754.202306050

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