渤海BZ19-X区块朵叶型浅水三角洲砂体精细刻画及剩余油挖潜

周军良; 赵军寿; 白清云; 汪全林; 汪跃

doi:10.3969/j.issn.1006-6535.2025.01.006

特种油气藏 >

2025 , Vol. 32 >Issue 1: 51 - 60

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.01.006

地质勘探

渤海BZ19-X区块朵叶型浅水三角洲砂体精细刻画及剩余油挖潜

周军良 ,
赵军寿 ,
白清云 ,
汪全林 ,
汪跃

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中海石油(中国)有限公司天津分公司,天津 300459

周军良(1983—),男,高级工程师,2007年毕业于中国石油大学(华东)资源勘查工程专业,2010年毕业于该校地质学专业,获硕士学位,现主要从事油气田开发地质综合研究工作。

收稿日期: 2023-03-20

修回日期: 2024-11-27

网络出版日期: 2025-05-13

基金资助

中海石油(中国)有限公司科技重大专项“海上中浅层薄储层描述及挖潜关键技术研究”(KJZH-2024-2203)

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Fine charcterization of lobate shallow-water delta sandbodies and remaining oil potential tapping in Bohai Block BZ19-X

ZHOU Junliang ,
ZHAO Junshou ,
BAI Qingyun ,
WANG Quanlin ,
WANG Yue

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CNOOC (China) Tianjin Company, Tianjin 300459, China

Received date: 2023-03-20

Revised date: 2024-11-27

Online published: 2025-05-13

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摘要

渤海BZ19-X区块多期叠置朵叶型浅水三角洲砂体发育,复合朵叶体内部沉积期次及叠置样式认识不清,制约了该区块剩余油挖潜。为此,利用岩心、分析化验、测井及地震等资料,确定朵叶型浅水三角洲沉积特征,建立井震响应模式,以平面地震属性刻画的砂体边界为控制,通过井震融合,结合层拉平及等时地层切片,实现不同叠置类型复合朵叶型浅水三角洲砂体的精细刻画,为剩余油挖潜提供基础。结果表明:研究区朵叶型浅水三角洲河控作用明显,平面可分为河道区、河坝复合区和浅湖区;受河道侧向迁移及纵向下切的影响,在平面及纵向发育多期朵叶体,侧向接触样式主要为分离型、侧搭型、侧切型、间连型,纵向叠置样式主要为远离型、弱切型、浅切型、深切型,侧向接触及纵向叠置使得砂体连片发育;受砂体接触、叠置样式及井网控制程度的影响,无井控、井网不完善的单期砂体和井控程度高的切叠复合砂体,其井间及边部往往剩余油富集。该研究结果对区块高含水期油藏剩余油的挖潜有较好的指导作用,对国内外类似区块的开发调整具有借鉴意义。

关键词： 浅水三角洲; 叠置样式; 地震相; 砂体刻画; 剩余油; 渤海BZ19-X区

本文引用格式

周军良 , 赵军寿 , 白清云 , 汪全林 , 汪跃 . 渤海BZ19-X区块朵叶型浅水三角洲砂体精细刻画及剩余油挖潜[J]. 特种油气藏, 2025 , 32(1) : 51 -60 . DOI: 10.3969/j.issn.1006-6535.2025.01.006

Abstract

Bohai Block BZ19-X is characterized by the development of multi-stage superimposed lobate shallow-water delta sandbodies. However, the unclear understanding of the internal depositional sequences and superimposition patterns of these composite lobate bodies has constrained the potential for remaining oil recovery in the block. To address this issue, core samples, analytical tests, well logging, and seismic data have been utilized to determine the depositional characteristics of lobate shallow-water delta deposits and to establish well-to-seismic response models. By using the sandbody boundaries delineated by planar seismic attributes as a control and integrating well-to-seismic fusion with bed flattening and isochronous stratigraphic slicing, the fine characterization of different superimposed types of composite lobate shallow-water delta sandbodies has been achieved, thus providing a foundation for the potential of remaining oil recovery. The results show that: within the study area, the fluvial control over lobate shallow-water delta deposits is evident, and the plane can be divided into channel areas, bar complex areas, and shallow lake areas. Affected by the lateral migration and vertical cutting of channels, multiple lobate bodies develop both laterally and vertically. The main lateral contact styles are separated, side-lapping, side-cutting, and inter-connected, while the vertical superimposition patterns are primarily divergent, weakly-cutting, shallow-cutting, and deep-cutting. Lateral contact and vertical superimposition lead to the continuous development of sandbodies. Affected by the contact and superimposition styles of sandbodies, as well as the degree of well network control, single-stage sandbodies without well control and those with an incomplete well network, as well as composite sandbodies with a high degree of well control, tend to have concentrated remaining oil in the interwell and marginal areas. The results of this study provide effective guidance for the recovery of remaining oil in high water-cut oil reservoirs in the block and have reference significance for the development adjustment of similar blocks at home and abroad.

Key words： shallow-water delta; stacking style; seismic phase; sandbody characterization; remaining oil; Bohai Block BZ19-X

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