南堡凹陷柳赞地区沙三段层序结构及其构造响应

doi:10.12108/yxyqc.20200309

岩性油气藏 ›› 2020, Vol. 32 ›› Issue (3): 93–103.doi: 10.12108/yxyqc.20200309

南堡凹陷柳赞地区沙三段层序结构及其构造响应

任梦怡¹, 江青春¹, 刘震², 卢朝进²

1. 中国石油勘探开发研究院, 北京 100083;
2. 中国石油大学(北京)地球科学学院, 北京 102299

收稿日期:2019-09-25 修回日期:2019-11-27 出版日期:2020-05-21 发布日期:2020-04-30
第一作者:任梦怡(1991-),女,中国石油勘探开发研究院在读博士研究生,研究方向为碳酸盐岩储层与油气成藏。地址:(100083)北京市海淀区学院路20号。Email:renmengyi_1991@163.com。
基金资助:
国家科技重大专项“下古生界—前寒武系碳酸盐岩油气成藏规律、关键技术及目标评价”（编号：2016ZX05004-001）资助

Sequence architecture and structural response of the third member of Shahejie Formation in Liuzan area，Nanpu Sag

REN Mengyi¹, JIANG Qingchun¹, LIU Zhen², LU Chaojin²

1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102299, China

Received:2019-09-25 Revised:2019-11-27 Online:2020-05-21 Published:2020-04-30

摘要/Abstract

摘要： 南堡凹陷柳赞地区古近纪陆源碎屑在马头营凸起—南堡凹陷源—汇体系控制下发育多期层序，其结构及内部沉积充填特征存在显著差异。利用地震、测录井以及岩心资料，结合频谱属性趋势分析（INPEFA—Integrated Prediction Error Filter Analysis）与属性提取等技术，阐明了沙三段层序结构演化特征，重点讨论了构造活动对断陷盆地层序演化的控制作用。结果表明：①沙三段发育5个三级层序，内部四级层序可划分为“上升”、“以上升半旋回为主的非对称”、“近对称”、“以下降半旋回为主的非对称”以及“下降”5类层序单元。②三级层序内发育（进积型或退积型）扇三角洲—近岸水下扇沉积体系，从湖侵域向湖退域、从盆缘向湖盆中心由“以上升半旋回为主的非对称（上升半旋回）”变化为“近对称旋回”再演变为“以下降半旋回为主的非对称（下降半旋回）”的层序结构。③沙三段层序结构演化受幕式构造沉降控制，沙三段—沙二段次级构造幕先快速沉降后减缓沉降，对应沉积物供给经历早期物源供给不足后期碎屑物质大量注入的过程，而沙一段—东营组次级构造幕引起湖盆掀斜，导致早期地层向上翘倾；层序内砂体类型与展布受边界断层差异活动影响，大型砂体展布方向呈“北→北东→东”的顺时针变化；层序内沉积单元叠置受盆内次级断层与断裂坡折带组合控制。该研究成果不仅为柳赞地区砂岩体分布预测提供了有力地质理论支持，而且深化了陆相断陷盆地砂岩体形成机制研究成果。

关键词: 层序结构, 沉积充填, 构造差异活动, 沙河街组, 南堡凹陷

Abstract: With the source to sink system of Nanpu Sag-Matouying uplift,sediments sink to the Liuzan area in Nanpu Sag developed multi-period sequence,whereas the architecture and sedimentary filling characteristic exist a significant difference. On the basis of seismic,drilling,logging and core data,according to Integrated Prediction Error Filter Analysis(INPEFA) and attribute extraction,evolution of sequence architecture was stated. The controls of tectonics on sequence architecture of terrestrial rift basin were emphatically discussed. The results show that:(1) Five 3rd-order sequences were identified in the third member of Shahejie Formation(Es₃). And five types of sequence unit were established,namely "ascending", "ascending-dominated", "near-symmetrical", "descending-dominated" and "descending" in 4th-order sequences.(2) Progressing or retrograding fan delta and coastal subsea apron were developed. From sag margin to center(or from TST to RST),the sequence architecture was evolved from "(ascending) ascending-dominated" pattern to "near-symmetrical" pattern and to "(descending) descending-dominated" pattern.(3) Sequence architecture is controlled by episodic tectonic subsidence. The subsidence rate in Es₃-Es₂ was accelerated in the early period and reduced in the late period. The corresponding sediments supply was limited,followed by a sudden increase during the late period. The hanging wall tilting rotations during the Es₁-Ed periods led to the warped stratum. The both type and distribution of sediments were affected by the differential activities of boundary faults. The distribution of large-scale sand-body changed clockwise in a "north- northeast-east" direction. The superpositions of sedimentary units were influenced by the combination of secondary faults and fault slope-break zones.The results provide strong geological theory support for the prediction of sandstone reservoir distribution in Liuzan area,but also deepen the research on the formation mechanism of continental fault basin sandstone reservoir.

Key words: sequence architecture, sedimentary infill, differential fault activity, Shahejie Formation, Nanpu Sag

中图分类号:

TE121.3

任梦怡, 江青春, 刘震, 卢朝进. 南堡凹陷柳赞地区沙三段层序结构及其构造响应[J]. 岩性油气藏, 2020, 32(3): 93–103.

REN Mengyi, JIANG Qingchun, LIU Zhen, LU Chaojin. Sequence architecture and structural response of the third member of Shahejie Formation in Liuzan area，Nanpu Sag[J]. Lithologic Reservoirs, 2020, 32(3): 93–103.

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南堡凹陷柳赞地区沙三段层序结构及其构造响应

Sequence architecture and structural response of the third member of Shahejie Formation in Liuzan area，Nanpu Sag

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