渤海湾盆地沾化凹陷古近系沙三下亚段旋回地层学分析及地层划分

doi:10.12108/yxyqc.20240302

岩性油气藏 ›› 2024, Vol. 36 ›› Issue (3): 19–30.doi: 10.12108/yxyqc.20240302

渤海湾盆地沾化凹陷古近系沙三下亚段旋回地层学分析及地层划分

方旭庆¹, 钟骑², 张建国², 李军亮³, 孟涛³, 姜在兴², 赵海波¹

1. 中国石化胜利油田分公司油气勘探管理中心, 山东东营 257001;
2. 中国地质大学(北京)能源学院, 北京 100083;
3. 中国石化胜利油田分公司勘探开发研究院, 山东东营 257015

收稿日期:2023-01-20 修回日期:2023-03-10 出版日期:2024-05-01 发布日期:2024-04-30
第一作者:方旭庆（1971—），男，博士，教授级高级工程师，主要从事油气勘探研究与管理工作。地址:（257001）山东省东营市东营区北二路胜建大厦。Email:fangxuqing.slyt@sinopec.com。
通信作者: 张建国（1989—），男，博士，副教授。主要从事储层沉积学工作。Email:jianguozhangenergy@163.com。
基金资助:
国家自然科学基金项目“天文旋回约束下的湖相泥页岩沉积作用：以济阳坳陷始新统为例”（编号：41772090）资助。

Cyclostratigraphy analysis and stratigraphic division of lower Sha-3 member of Paleogene in Zhanhua Sag，Bohai Bay Basin

FANG Xuqing¹, ZHONG Qi², ZHANG Jianguo², LI Junliang³, MENG Tao³, JIANG Zaixing², ZHAO Haibo¹

1. Manage Center of Oil and Gas Exploration, Shengli Oilfield Company, Sinopec, Dongying 257001, Shandong, China;
2. College of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
3. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China

Received:2023-01-20 Revised:2023-03-10 Online:2024-05-01 Published:2024-04-30

摘要/Abstract

摘要： 湖相细粒沉积多具有连续性，能记录和保存显著的天文旋回信号，是进行天文旋回分析的理想地层。通过对渤海湾盆地沾化凹陷重点井沙三下亚段自然伽马数据进行 MTM 频谱分析和 FFT 进化谐波分析，建立了“浮动”天文年代标尺，并在单井上进行了天文旋回地层划分及连井地层对比，为全区搭建了地层格架。研究结果表明：①渤海湾盆地沾化凹陷沙三下亚段记录了显著的天文旋回信号，匹配出最优沉积速率为 9.0×10³ cm/Ma；由长偏心率、短偏心率、斜率和岁差周期产生的旋回地层厚度分别为 42.3 m，9.0 m，2.4~4.7 m 和1.3~1.9 m；②沙三下亚段比较稳定的记录了 6 个长偏心率旋回、25 个短偏心率旋回，可将短偏心率曲线作为地层划分依据来进行高精度地层对比。③运用天文旋回理论进行岩相发育规律、岩相空间配置关系的预测，可为湖盆沉积中心页岩油气地质“甜点”的精细勘探提供依据。

关键词: 湖相细粒沉积, 天文年代标尺, 天文旋回, 高精度地层对比, 长偏心率旋回, 短偏心率旋回, 沙三下亚段, 古近系, 沾化凹陷, 渤海湾盆地

Abstract: Lacustrine fine-grained sediments often have continuity and can record and preserve significant astronomical cycle signals, making them ideal strata for astronomical cycle analysis. MTM spectrum analysis and FFT evolutionary harmonic analysis were conducted for natural gamma data of the lower Sha-3 member of key wells in Zhanhua Sag, Bohai Bay Basin, a“floating”astronomical timescale was established, astronomical cyclostratigraphic division of single well and well-tie stratigraphic correlation were carried out, and the stratigraphic frame-work was established. The results show that:（1）Significant astronomical cycle signals were recorded in the lower Sha-3 member in Zhanhua Sag, and the optimal sedimentation rate was matched to be 9.0×10³ cm/Ma. The cycle thicknesses corresponding to long eccentricity, short eccentricity, obliquity and precession cycle are 42.3 m, 9.0 m, 2.4-4.7 m and 1.3-1.9 m, respectively.（2）Six long eccentricity cycles and 25 short eccentricity cycles were stably recorded in the lower Sha-3 member, and the short eccentricity curves can be used as the stratigraphic division interface for high-precision stratigraphic correlation.（3）The application of astronomical cycle theory to predict the development patterns and spatial configuration relationships of lithofacies can provide a basis for the precise exploration of geological“sweet spots”of shale oil and gas in the sedimentary

Key words: lacustrine fine-grained sediment, astronomical timescale, astronomical cycle, high-precision stratigraphic correlation, long eccentricity cycle, short eccentricity cycle, lower Sha-3 member, Paleogene, Zhahua Sag, Bohai Bay Basin

中图分类号:

TE121.3+4

方旭庆, 钟骑, 张建国, 李军亮, 孟涛, 姜在兴, 赵海波. 渤海湾盆地沾化凹陷古近系沙三下亚段旋回地层学分析及地层划分[J]. 岩性油气藏, 2024, 36(3): 19–30.

FANG Xuqing, ZHONG Qi, ZHANG Jianguo, LI Junliang, MENG Tao, JIANG Zaixing, ZHAO Haibo. Cyclostratigraphy analysis and stratigraphic division of lower Sha-3 member of Paleogene in Zhanhua Sag，Bohai Bay Basin[J]. Lithologic Reservoirs, 2024, 36(3): 19–30.

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渤海湾盆地沾化凹陷古近系沙三下亚段旋回地层学分析及地层划分

Cyclostratigraphy analysis and stratigraphic division of lower Sha-3 member of Paleogene in Zhanhua Sag，Bohai Bay Basin

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