柴西南古近系—新近系盐湖盆地层序地层分析
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摘要
为了探讨柴达木盆地西南古近系-新近系层序地层,为岩性油气藏勘探提供依据,本文在Cross高分辨率层序地层学理论指导下,综合利用露头、岩心、钻井、地震等资料,结合盐湖盆地的沉积特殊性,对柴西南古近系—新近系层序界面进行识别与层序划分。研究认为将柴达木盆地柴西南古近系—新近系地层划分为13个长期旋回更为合理,提出缓坡带、陡坡带、低凸地区和湖盆区4种不同沉积单元的层序发育模式,指出层序旋回结构对岩性圈闭具有重要的控制作用,储集砂岩的发育状况与中期旋回密切相关,有利储层主要发育在旋回结构向上"变深"的非对称型下部。
Sequence stratigraphic study of the salt lake with lately started and weak foundations in Qaidam Basin is important in many respects. In order to analyze the sequence stratigraphy in Paleogene and Neogene in southwestern Qaidam Basin and provide a foundation for lithologic hydrocarbon reservoir exploration,this paper studies the sequence boundary identification and the sequence classification in Paleogene and Neogene in southwestern Qaidam Basin by using sequence stratigraphic method,and applying outcrop data,core,drilling data and seismic data. It is shown that the classification in terms of 13 long-term circles is reasonable,and there are 4 sequence developing patterns:gentle slope zone,abrupt slope zone,low uplift zone and Lake Basin. And it is also shown that the sequence circle structure plays a significant role in controlling the lithologic trap,the development of sandstone reservoir is closely related to the mid-term circle,and favorable reservoirs mainly develop at the bottom of the circle structure with a trend of "becoming deeper upward".
Sequence stratigraphic study of the salt lake with lately started and weak foundations in Qaidam Basin is important in many respects. In order to analyze the sequence stratigraphy in Paleogene and Neogene in southwestern Qaidam Basin and provide a foundation for lithologic hydrocarbon reservoir exploration,this paper studies the sequence boundary identification and the sequence classification in Paleogene and Neogene in southwestern Qaidam Basin by using sequence stratigraphic method,and applying outcrop data,core,drilling data and seismic data. It is shown that the classification in terms of 13 long-term circles is reasonable,and there are 4 sequence developing patterns:gentle slope zone,abrupt slope zone,low uplift zone and Lake Basin. And it is also shown that the sequence circle structure plays a significant role in controlling the lithologic trap,the development of sandstone reservoir is closely related to the mid-term circle,and favorable reservoirs mainly develop at the bottom of the circle structure with a trend of "becoming deeper upward".
引文
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[2]纪友亮,胡光明,张善文,等.沉积层序界面研究中的矿物及地球化学方法[J].同济大学学报,2004,32(4),455-460.Ji Youliang,Hu Guangming,Zhang Shanwen,et al.Journal of Tongji University,2004,32(4),455-460.
[3]方志雄,陈开远,杨香华,等.潜江盐湖盆地层序地层特征[J].盐湖研究,2003,11(2),14-23.Fang Zhixiong,Chen Kaiyuan,Yang Xianghua,et al.Journal of Salt Lake Research,2003,11(2),14-23.
[4]杨香华,陈开远,石万忠,等.东濮凹陷盐湖层序结构与隐蔽油气藏[J].石油与天然气地质,2002,23(2),139-142.Yang Xianghua,Chen Kaiyuan,Shi Wanzhong,et al.Oil&Gas Geology,2002,23(2),139-142.
[5]纪友亮,冯建辉,王声朗,等.东濮凹陷下第三系沙三段盐岩和膏盐岩的成因[J].沉积学报,2005,32(2),225-231.Ji Youliang,Feng Jianhui,Wang Shenglang,et al.Acta Sedimentologica Sinica,2005,32(2),225-231.
[6]蒋宏忱,于柄松,王黎栋,等.柴达木盆地西部红狮凹陷第三系下干柴沟组层序地层格架[J].现代地质,2002,16(4):382-388.Jiang Hongchen,Yu Bingsong,Wang Lidong,et al.Geoscience,2002,16(4):382-388.
[7]吴因业,江波,郭彬程,等.岩性油气藏勘探的沉积体系域表征技术——以柴达木盆地为例[J].新疆石油地质,2004,25(4):358-361.Wu Yinye,Jiang Bo,Guo Bincheng,et al.Xinjiang Petroleum Geology,2004,25(4):358-361.
[8]胡光明,纪友亮,张亚京.陆相盐湖层序地层学研究简述[J].盐湖研究,2006,14(1):55-59.Hu Guangming,Ji Youliang,Zhang Yajing.Journal of Salt Lake Research,2006,14(1):55-59.
[9]李春荣,陈开远,柳保军,等.盐湖盆地沉积与油气形成的关系[J].西部探矿工程,2004,96(5):46-49.Li Chunrong,Chen Kaiyuan,Liu Baojun,et al.West-China Exploration Engineering,2004,96(5):46-49.
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