石油学报 ›› 2016, Vol. 37 ›› Issue (3): 348-359.DOI: 10.7623/syxb201603007

• 地质勘探 • 上一篇    下一篇

湖相重力流沉积特征及发育模式——以苏北盆地高邮凹陷深凹带戴南组为例

袁静1, 梁绘媛2, 梁兵3, 董道涛1, 闵伟2, 宋璠1, 李鹤永3   

  1. 1. 中国石油大学地球科学与技术学院 山东 青岛 266580;
    2. 中国石油化工股份有限公司胜利油田分公司 山东 东营 257000;
    3. 中国石油化工股份有限公司江苏油田分公司 江苏 扬州 225012
  • 收稿日期:2015-09-21 修回日期:2016-01-11 出版日期:2016-03-25 发布日期:2016-04-12
  • 通讯作者: 袁静,女,1972年6月生,1993年毕业于石油大学(华东)石油地质专业,1999年获石油大学(北京)理学博士学位,现为中国石油大学(华东)地球科学与技术学院教授,主要从事储层沉积学和储层地质学研究。Email:drjyuan@163.com
  • 作者简介:袁静,女,1972年6月生,1993年毕业于石油大学(华东)石油地质专业,1999年获石油大学(北京)理学博士学位,现为中国石油大学(华东)地球科学与技术学院教授,主要从事储层沉积学和储层地质学研究。Email:drjyuan@163.com
  • 基金资助:

    中国石油化工股份有限公司科技攻关项目(P13125)资助。

Sedimentary characteristics and development model of lacustrine gravity flow: a case study of Dainan Formation in deep sag belt of Gaoyou depression, Northern Jiangsu Basin

Yuan Jing1, Liang Huiyuan2, Liang Bing3, Dong Daotao1, Min Wei2, Song Fan1, Li Heyong3   

  1. 1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Sinopec Shengli Oilfield Company, Shandong Dongying 257000, China;
    3. Sinopec Jiangsu Oilfield Company, Jiangsu Yangzhou 225012, China
  • Received:2015-09-21 Revised:2016-01-11 Online:2016-03-25 Published:2016-04-12

摘要:

以苏北盆地高邮凹陷深凹带戴南组一段-戴南组二段五亚段为研究对象,以岩心精细观察和岩石薄片镜下鉴定为主要手段,结合测录井资料解释等描述重力流沉积特征和岩相特征,综合考虑沉积特征、形成过程、支撑机理及沉积机理等因素划分重力流类型,根据古构造和古地理背景、重力流类型和转化特征综合分析建立重力流发育与转化模式。研究结果表明:高邮凹陷深凹带戴南组主要发育碎屑流、浊流和液化流3种沉积物重力流和滑动-滑塌这一重要的斜坡沉积物重力流触发机制;其中以碎屑流最为常见,根据其沉积物粒度构成特征划分为砾质碎屑流、砂质碎屑流和泥质碎屑流,根据其物质来源划分为外源型碎屑流和内源型碎屑流。识别出8种重力流沉积岩相和4类重力流沉积典型岩相组合。建立了不同物源条件下的重力流发育与转化模式,包括断阶带物源方向的双断阶混源型、多断阶混源型和斜坡带物源方向的内源型模式。断阶带重力流来自物源老山,以砾质碎屑流、砂质碎屑流、泥质碎屑流、浊流为主,所属沉积相类型包括扇三角洲、近岸水下扇和湖底扇;斜坡带重力流物源为三角洲前缘沉积物,以滑动-滑塌、液化流、砂质碎屑流、浊流为主,形成风暴浪基面之上的事件沉积体和深湖区的湖底扇。

关键词: 重力流, 碎屑流, 流体转化, 发育模式, 高邮凹陷

Abstract:

Taking the sub-member 5 of Member 2 of Dainan Formation in deep sag belt of Gaoyou Depression, Northern Jiangsu Basin as a research object, based on core observation and microscopic identification of rock thin-sections in combination with logging data interpretation, this study describes the sedimentary and lithofacies characteristics of gravity flow. The main types of gravity flows are divided by comprehensively considering the sedimentary characteristics, formation process, as well as supporting and sedimentary mechanism. The development and transform models of gravity flows are established according to the paleo-tectonic and paleo-geographic background as well as the types and transform characteristics of gravity flows. The research results indicate that three types of sediment gravity flows, such as debris flow, turbidities and liquefied flow, are mainly developed in Dainan Formation along the deep sag belt of Gaoyou Depression, where slip-collapse is identified as an important trigger mechanism of slope sediment gravity flows. Among them, debris flow is most commonly found, and divided into gravel debris flow, sandy debris flow and muddy debris flow according to the grain-size composition of sediment. It can also be divided into extrabasinal type and intrabasinal type according to material source. There is a combination between eight types of gravity-flow sedimentary lithofacies and four types of typical gravity-flow sedimentary lithofacies. The development and transformation models of gravity flows in different provenance conditions are established, including double fault-terrace mixed-source mode and multiple fault-terrace mixed-source mode in terms of fault-terrace belt provenance as well as intrabasinal source mode in terms of slope belt provenance. The gravity flows of fault-terrace belt are derived from parent rock area, dominated by gravel debris flow, sandy debris flow, muddy debris flow and turbidities, of which the sedimentary facies include fan delta, near-shore subaqueous fan and sublacustrine fan. The gravity flows of slope belt are sourced from the delta front sediments, dominated by slip-collapse, liquefied flow, sandy debris flow and turbidities, thus forming the event sedimentary body above storm wave base and sublacustrine fan in deep lake zones.

Key words: gravity flow, debris flow, flow transform, development model, Gaoyou sag

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