河控型浅水三角洲前缘河道砂体结构特征

赵汉卿; 李超; 郭诚; 岳红林; 张正龙

doi:10.16028/j.1009-2722.2023.019

河控型浅水三角洲前缘河道砂体结构特征

1.
中海石油（中国）有限公司天津分公司，天津 300452

基金项目: 国家科技重大专项“渤海海域大中型油气田地质特征”（2011ZX05023-006-002）；中海石油（中国）有限公司科技重大专项“渤海双高油田挖潜关键技术研究”（YXKY-2018-TJ-04）

详细信息

作者简介: 赵汉卿（1989—），男，硕士，高级工程师，主要从事沉积学、油气田开发地质学等方面的研究工作. E-mail：zhaohq17@cnooc.com.cn

中图分类号: P736；P618.13

收稿日期: 2023-02-09

刊出日期: 2024-02-28

Geomorphology of channel sandbodies in fluvially dominated shallow water delta front: taking the Lower Member of the Minghuazhen Formation in BZ34 Oilfield of the Huanghekou Sag, Bohai Bay Basin as an example

1.
Tianjin Branch of CNOOC (China) Ltd., Tianjin 300459, China

Received Date: 09 February 2023

Publish Date: 28 February 2024

摘要

摘要:
新近系明化镇组下段（明下段，N₁m^l）为黄河口凹陷BZ34油区的主力含油层段，该时期主要发育河控型浅水三角洲前缘沉积。为更好地表征前缘砂体的结构特征及展布规律，以BZ34油区明下段Ⅱ油组为例，综合应用岩芯、地震属性和测井等资料，分析总结了该地区的砂体沉积类型、砂体结构及沉积模式。研究结果表明：BZ34油区明下段Ⅱ油组砂体以浅水三角洲前缘水下分流河道为主；依据测井形态和叠置关系，将其砂体结构类型划分为4种：块状切叠型河道、层状叠置型河道、层状孤立型河道和指状孤立型河道；砂体结构展布特征及成因主要受古地形、沉积物供给速率、基准面旋回和古气候等因素影响。BZ34油区的水下分流河道沉积，具有垂向上交错叠置、平面上摆动连片的分布特征，与鄱阳湖现代河控浅水三角洲河道的沉积特征类似。该研究对BZ34油区后期部署加密调整井和剩余油挖潜工作具有指导意义。
- 河控型浅水三角洲 /
- 砂体结构 /
- 明下段 /
- BZ34油区 /
- 黄河口凹陷
Abstract:
The Lower Member of the Neogene Minghuazhen Formation (N₁m^l) is the main oil-bearing sand body unit in the BZ34 Oilfield in Huanghekou Sag, Bohai Bay Basin, North China, in which delta front deposits in fluvially dominated shallow waters were developed. To better characterize the structural characteristics and distribution of the front sand bodies, taking the second oil unit of N₁m^l as an example, the sedimentary types, geomorphological structures, and depositional models of the sand body were analyzed based on the data from coring, seismic profiling, and logging. Results show that the sand bodies are dominated by underwater distributary channels in shallow water delta front. According to the logging curves and overlapping of the sand bodies, four channel types were recognized: massive incised river channel, layered overlapping channel, layered isolated channel, and finger-shaped isolated channel. The distribution and genesis of the sand bodies were affected mainly by paleotopography, sediment supply rate, base level cycle, and paleoclimate. The underwater distributary channel deposits in the BZ34 Oil Field are characteristic of incisive superposition in vertical direction and meandering patchy distribution in horizontal, which is similar to the modern case of fluvially dominated shallow water delta channels in Poyang Lake, South China. This study provided a guidance for infill adjustment and potential tapping in later stage for the remaining oil in BZ34 Oilfield.
- fluvially dominated shallow water deposit /
- sand body morphology /
- N₁m^l /
- BZ34 Oilfield /
- Huanghekou Sag

HTML全文

图 1 黄河口凹陷BZ34油区区域地质图

Figure 1.

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图 2 BZ34油区明下段Ⅱ油组水下分流河道砂体叠置类型

Figure 2.

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图 3 BZ34油区明下段最小振幅属性与砂岩净厚度关系

Figure 3.

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图 4 BZ34油区明下段Ⅱ油组砂体平面分布

Figure 4.

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图 5 BZ34油区明下段Ⅱ油组分流河道砂体结构连井剖面

Figure 5.

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图 6 鄱阳湖赣江浅水三角洲分流河道沉积特征

Figure 6.

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图 7 BZ34地区明下段Ⅱ油组古地貌及浅水三角洲发育特征

Figure 7.

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图 8 受控因素与分流河道砂体结构发育样式

Figure 8.

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图 9 BZ34油区Ⅱ油组分流河道型浅水三角洲砂体沉积模式

Figure 9.

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表 1 BZ34油区明下段Ⅱ油组泥岩X衍射黏土矿物成分数据

Table 1. X-ray diffraction result of clay mineral composition of mudstone of the N₁m^l in BZ34 Oilfield

井名深度/m 伊利石/% 高岭石/% 绿泥石/% 伊/蒙混层/%

A9井 1 359.10 4 5 4 87
1 364.12 8 11 8 73
1 368.92 10 11 7 72

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