涠西南凹陷流一段上亚段重力流沉积特征及发育模式
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何卫军(1979—),男,湖北恩施人,工程师,硕士,从事油气勘探与沉积层序研究工作。联系电话:(0759)3912428,E-mail:hewj@cnooc.com.cn。

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国家科技重大专项“南海西部海域低渗油藏勘探开发关键技术”(2016ZX05024-006)。


Sedimentary characteristics and development of gravity flow in the upper submember of the first member of Liushagang Formation in Weixi’nan Sag
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    摘要:

    基于钻井、测井、岩心、分析化验及三维地震资料,研究涠西南凹陷流一段上亚段重力流类型、沉积特征及发育模式。结果表明,研究区流一段上亚段主要发育碎屑流、浊流和滑塌沉积3种重力流类型,碎屑流和滑塌沉积在研究区最为发育。碎屑流沉积据其岩性构成可细分为砂质碎屑岩和泥质碎屑岩,砂质碎屑岩以发育块状构造,见泥质撕裂屑、漂浮泥砾为典型特征;滑塌沉积塑性变形构造发育,既体现重力流沉积特征,同时还部分保留牵引流沉积特征。湖平面变化、物源体系、坡折带及沟源通道等耦合控制重力流沉积类型及分布,在研究区建立了北西物源三角洲-断裂坡折-侵蚀水道和西物源三角洲-同沉积坡折2种经典的重力流沉积模式。

    Abstract:

    Sedimentary types,characteristics and depositional model of gravity flow developing in the upper submember of the first member of Liushagang Formation in Weixi’nan Sag were studied based on drilling,logging,core,experimental data and 3D seismic. The results show that there are three types of gravity flows including debris flow,turbidite current and slump deposit in the upper submember of the first member of Liushagang Formation in Weixi’nan Sag,among which debris flow and slump mainly develop in the study region. Debris flow can be divided into sandy debris flow and muddy debris flow according to its lithological composition. The sandy debris flow is characterized by massive structures,argillaceous rigup and floating mud-gravel.Well-developed plastic deformation structures in slumps deposit which shows the characteristics of gravity flow deposits,and retains the characteristics of traction flow deposits. The coupling of lake level change,provenance system,slope broken and source channel controls the sedimentary types and distribution of gravity flow,and two classical depositional models of gravity flow are summarized including north-west provenance delta-faulted slope-erosion channel and west provenance delta-synsedimentary slope broken.

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何卫军,甘军,刘芳,焦祥燕,罗威,黄灿.涠西南凹陷流一段上亚段重力流沉积特征及发育模式[J].油气地质与采收率,2019,26(3):31~37

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  • 在线发布日期: 2019-07-23