陆相断陷湖盆强制湖退及沉积响应:以莱州湾凹陷沙三段为例<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2020.03.031

古地理学报 ›› 2020, Vol. 22 ›› Issue (3): 457-468. doi: 10.7605/gdlxb.2020.03.031

• 岩相古地理学及沉积学 • 上一篇下一篇

陆相断陷湖盆强制湖退及沉积响应:以莱州湾凹陷沙三段为例^*

秦祎^1,2, 朱筱敏^1,2, 王彤^1,2, 郭诚³, 谢爽慧^1,2

1 中国石油大学(北京)地球科学学院,北京 102249;
2 中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;
3 中海石油(中国)有限公司天津分公司渤海石油研究院,天津 300450

收稿日期:2020-03-09 修回日期:2020-04-05 出版日期:2020-06-01 发布日期:2020-06-06
通讯作者: 朱筱敏,男,1960年生,中国石油大学(北京)地球科学学院教授,博士生导师,主要从事沉积学和层序地层学教学和科研工作。E-mail: xmzhu@cup.edu.cn。
作者简介:秦祎,女,1993年生,中国石油大学(北京)地球科学学院博士研究生,主要从事沉积学和层序地层学研究。E-mail: qinyi_qs@163.com。
基金资助:
*国家重大科技专项(编号: 2017ZX05001-002-002)资助

Forced regression and its sedimentary response to continental lacustrine rift basin: A case of the Member 3 of Shahejie Formation in Laizhouwan sag,Bohai Bay Basin

Qin Yi^1,2, Zhu Xiao-Min^1,2, Wang Tong^1,2, Guo Cheng³, Xie Shuang-Hui^1,2

1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249, China;
2 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;
3 Bohai Oilfield Research Institute,Tianjin Branch of CNOOC(China),Tianjin 300450,China

Received:2020-03-09 Revised:2020-04-05 Online:2020-06-01 Published:2020-06-06
Contact: Zhu Xiao-Min,born in 1960,is a professor and Ph.D. supervisor in China University of Petroleum(Beijng). He is mainly engaged in sedimentology and sequence stratigraphy. E-mail: xmzhu@cup.edu.cn.
About author:About the first author Qin Yi,born in 1993,is a Ph.D. candidate in China University of Petroleum(Beijng). She is engaged in sedimentology and sequence stratigraphy. E-mail: qinyi_qs@163.com.
Supported by:
Financially supported by the National Science and Technology Major Project(No.2017ZX05001-002-002)

摘要/Abstract

摘要： 强制湖退体系域(FSST)是由相对湖平面下降驱动、发育于相同层序高位体系域之上及新层序低位体系域之下、在相对湖平面下降时期形成的、与油气勘探关系密切的一种退覆地层,与沉积物供给的变化无关。基于三维地震、钻井岩心和测录井资料,在层序地层学和沉积学理论指导下,发现莱州湾凹陷古近系沙河街组三段发育一套强制湖退体系域地层,垂向上可划分为3期,自下而上命名为P1、P2和P3,P1向湖盆中央终止于FSST底界面,P3顶部为显著不整合的层序界面。顺物源方向地震响应特征为缺失顶积层的低角度斜交前积反射,该反射自西向东推进到湖盆中央;在垂直物源方向的地震剖面上,可见下切谷地震响应。测井响应GR曲线呈漏斗状的复合体,表明沉积响应为上粗下细的反旋回。岩心及测井相分析结果表明,该FSST为一套河流—三角洲沉积体系,三角洲前缘伴生滑塌湖底扇沉积体。综合盆地区域构造演化、沉积物供给和气候变化等因素,认为该套沉积体系是气候相对干旱和绝对湖平面下降的共同产物。莱州湾凹陷沙三段FSST的发现对其沉积解释具有重要地质意义,对研究区进一步的油气勘探开发具有指导意义,也对研究陆相断陷湖盆FSST的形成与发现具有借鉴意义。

关键词: 层序地层学, 强制湖退体系域, 沉积体系, 沙河街组, 莱州湾凹陷

Abstract: Falling stage systems tract(FSST)is an offlap strata with strong relationship with hydrocarbon exploration,which is driven by relative lake-level fall and developed above the highstand systems tract and below the lowstand systems tract of a new sequence. It has no relationship with sediment supply. Based on the theory of sequence stratigraphy and sedimentology,3D seismic data,drilling core data,and well-logging data were comprehensively analyzed. The study showed that the FSST strata was formed in the Member 3 of Shahejie Formation in the Laizhouwan sag. The FSST can be divided into three units,namely as units P1,P2,and P3 from bottom to top. The P1 is the first unit of progradation downlap the bottom of the FSST. The top of the unit P3 is a sequence boundary exhibits subaerial unconformity. The seismic profile along the source direction is characterized by the low-angle oblique progradation reflection that downstream the center of lake basin from west to east. Incised valleys developed on the top of the FSST perpendicular to the source direction. Gamma-ray logging response is manifested by a series of funnel-shaped complex,indicating that the sedimentary response of the FSST was a cycle of coarsening-upward parasequence sets. Comprehensive studies on core interpretation and well-logging analysis showed that the FSST was a fluvial-delta sedimentary system with slumped fan deposits associated with the delta front. Consequently,the FSST is a common result of relative dry climate and falling of lake level,considering regional tectonic evolution,sediment supply,and paleo-climate change. The discovery of the FSST in the Laizhouwan sag has an important geological significance for the sedimentological interpretation,and it offers a guidance for further oil exploration in the study area. In addition,it also serves as a significant reference for future research on the FSST development and exploration in the continental lacustrine rift basin.

Key words: sequence stratigraphy, falling stage systems tract, sedimentary system, Shahejie Formation, Laizhouwan sag

中图分类号:

P539.2

秦祎, 朱筱敏, 王彤, 郭诚, 谢爽慧. 陆相断陷湖盆强制湖退及沉积响应:以莱州湾凹陷沙三段为例^*[J]. 古地理学报, 2020, 22(3): 457-468.

Qin Yi, Zhu Xiao-Min, Wang Tong, Guo Cheng, Xie Shuang-Hui. Forced regression and its sedimentary response to continental lacustrine rift basin: A case of the Member 3 of Shahejie Formation in Laizhouwan sag,Bohai Bay Basin[J]. JOPC, 2020, 22(3): 457-468.

http://www.gdlxb.cn/CN/Y2020/V22/I3/457

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陆相断陷湖盆强制湖退及沉积响应:以莱州湾凹陷沙三段为例^*

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陆相断陷湖盆强制湖退及沉积响应:以莱州湾凹陷沙三段为例*

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陆相断陷湖盆强制湖退及沉积响应:以莱州湾凹陷沙三段为例^*