Sedimentary characteristics and evaluation law in high-resolution sequence framework of Dongying Formation, North of Nanpu Sag

doi:10.3969/j.issn.2096-1693.2026.03.012

Abstract

Abstract:

In order to make sure the sedimentary characteristic and evaluation of Dongying Formation, we quantitatively divide the sequence framework and distribution of sedimentary facies, comprehensive application the wave coefficient curve and maximum entropy spectrum analysis, on the base of sequence boundaries recognize. The result is that, there are 2 long-term and 3 mid-term cycle boundaries in Dongying Formation. We divide the Dongying Formation into 4 mid-term cycles, like MSC1, MSC2, MSC3 and MSC4. The fan delta plains and submarine fans are concentrated on the Xinanzhuang Fault, Baigezhuang Fault and Gaoliu Fault, they change to the fan delta front and shallow lake gradually, from the boundary fault to the central of Nanpu Sag. The evaluation of sedimentary in Dongying Formation is controlled by the union of fault, provenance and base level cycle. The base level is rising quickly in MSC1, the sediment are mainly conglomerate, medium sandstone, fine sandstone in fan delta plains and fan delta front. The base level rising slowly, and attain the maximum in MSC2, the sediment are mainly mudstone in shallow lake and semi-deep lake, it is the main source rocks in study area. The subsidence rate decrease in MSC3 and MSC4, and the base level began to decline, the sediment are mainly siltstone, fine sandstone in fan delta front, they are the main reservoirs and productive series in the study area.

Key words: sedimentary characteristic, fan delta, slope break, high-resolution sequence, Dongying Formation, Nanpu Sag

摘要：

为明确东营组沉积与演化特征，在东营组层序界面识别基础上，结合小波系数曲线、最大熵谱分析开展层序格架定量划分，精细刻画不同层序单元内沉积相类型和展布。结果表明：东营组发育2个长期和3个中期旋回界面，分为MSC1、MSC2、MSC3和MSC4等4个中期基准面旋回。扇三角洲平原、近岸水下扇等近源、粗碎屑物质集中在西南庄断层、柏各庄断层、高柳断层下降盘，向凹陷内渐变为扇三角洲前缘和滨浅湖。断层活动、物源和基准面升降联合控制了东营组沉积体演化，MSC1时基准面快速上升，扇三角洲平原、前缘含砾砂岩、中粗砂岩和细砂岩最发育；MSC2时基准面缓慢上升并达到最大，沉积物以滨浅湖-半深湖泥岩为主，是本区主要的烃源岩层；MSC3、MSC4时沉降速率减小、基准面下降，以扇三角洲前缘粉砂岩、细砂岩为主，是本区主要的储集层和产油层。

关键词: 沉积特征, 扇三角洲, 坡折带, 高分辨率层序, 东营组, 南堡凹陷

CLC Number:

P618.13
TE34

CUI Jian, YANG Shenglai, JU Yajuan, WU Yuankun, ZUO Haiwei, ZHANG Yiqi. Sedimentary characteristics and evaluation law in high-resolution sequence framework of Dongying Formation, North of Nanpu Sag[J]. Petroleum Science Bulletin, 2026, 11(2): 353-368.

崔建, 杨胜来, 居亚娟, 吴远坤, 左海威, 张一琦. 南堡凹陷北部东营组高分辨率层序格架内沉积相特征与演化[J]. 石油科学通报, 2026, 11(2): 353-368.

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URL: https://sykxtb.cup.edu.cn/EN/10.3969/j.issn.2096-1693.2026.03.012

https://sykxtb.cup.edu.cn/EN/Y2026/V11/I2/353

Figures/Tables 13

Fig. 1 Structural position and stratigraphic column of the Nanpu Sag

Table 1 The characteristic and identification mark of sequence boundary in Dongying Formation, Nanpu Sag

层序界面	界面类型	地震反射特征	岩性	测井响应
SB1	构造不整合面	低频、较强振幅、强连续的同向轴；凹陷边缘上超、削截，内部整合接触	灰色粉砂质泥岩突变灰白色粗砂岩、含砾砂岩	Rt高阻异常；GR幅值呈阶梯状减小，
SB2	沉积突变面	较强振幅、中-高连续；凹陷边缘上超、顶超，凹陷内部过渡为整合接触	细砂岩渐变为薄层状粉砂岩、泥质粉砂岩	Rt存在明显拐点；GR幅值增加
SB3	沉积突变面	强振幅、强连续的同相轴，反射特征明显，全区可追踪对比	稳定的厚层状泥岩	Rt为低值异常的漏斗型；GR幅值增大
SB4	沉积转换面	中-高振幅、中-高频、连续性较好；边缘为削截、顶超，内部整合接触	中-厚层细砂岩、中砂岩	Rt高幅指状；GR低值异常
SB5	区域性不整合面	中高频、强振幅，连续性好	由粉砂岩、泥质粉砂岩突变为火山岩、砾岩	Rt高阻异常；GR幅值减小

Fig. 2 Characteristic of the sequence boundaries in Dongying Formation, Nanpu Sag

Fig. 3 Sequence framework of the Dongying Formation, Nanpu Sag

Fig. 4 Characteristics of sedimentary within the sequence framework in Dongying Formation, Nanpu Sag

Fig. 5 The sedimentary characteristics of fan delta in Dongying Formation, North Nanpu Sag

Fig. 6 Probability curves of sand body in different sedimentary facies in Dongying Formation, Nanpu Sag

Fig. 7 The sedimentary characteristics of submarine fans and shallow lake in Dongying Formation, Nanpu Sag

Fig. 8 Characteristics of different kinds of slope break and distribution of sandbody in Dongying Formation, Nanpu Sag

Fig. 9 Seismic attribution and sedimentary facies of LST in MSC4 sequence in Dongying Formation, Nanpu Sag

Fig. 10 Distribution of sedimentary facies of Dongying Formation in sequence framework, Nanpu Sag

Fig. 11 Distribution of the sedimentation rate in Dongying Formation, Nanpu Sag

Fig. 12 Sedimentary evolution of Dongying Formation within the high-resolution sequence framework, Nanpu Sag

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