地震沉积学在河流-浅水三角洲沉积相研究中的应用: 以渤海海域蓬莱A构造区馆陶组为例

付鑫; 杜晓峰; 官大勇; 李瑾; 李晓辉

doi:10.19509/j.cnki.dzkq.2021.0304

地震沉积学在河流-浅水三角洲沉积相研究中的应用: 以渤海海域蓬莱A构造区馆陶组为例

doi: 10.19509/j.cnki.dzkq.2021.0304

基金项目:

"十三五"国家重大专项 2016ZX05024-003

详细信息

作者简介:
付鑫(1989-), 男, 工程师, 主要从事层序地层学与油气储层地质学研究。E-mail: fuxin2@cnooc.com.cn

中图分类号: P315.3
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出版历程
- 收稿日期: 2020-10-17

Application of seismic sedimentology in reservoir prediction in fluvial to shallow water delta facies: A case study in Guantao Formation from the Penglai A structure area in Bohai Bay

摘要

摘要: 庙西南凸起蓬莱A构造区馆陶组有良好油气发现，但储层厚度多小于5 m，难以被精确识别刻画。以薄层砂体为研究对象，综合地震、测井、钻井岩心、古生物等基础资料，明确研究区馆陶组沉积时期受北东向物源供给沉积，发育河流-浅水三角洲相。基于90°相位化处理确定砂体地震响应特征；分频解释处理判断相对等时地震同相轴，构建馆陶组高频层序地层格架（三级层序SQ1-3），优选60Hz地震数据体进行地层切片划分；地层切片高精度沉积学解释揭示研究区馆陶组SQ1层序至SQ3层序依次发育河流-席状化浅水三角洲-朵叶状浅水三角洲-水下河道型浅水三角洲。其中SQ1层序中河道砂体以及SQ2-3层序中浅水三角洲前缘砂体皆为有利储层。此次研究丰富发展了渤海海域河流-浅水三角洲相中地震沉积学在砂体预测中的研究成果。
- 地震沉积学 /
- 渤海海域 /
- 河流-浅水三角洲相 /
- 储层预测 /
- 馆陶组
Abstract: The Penglai A structure area in the Miaoxinan uplift had good drilling show of oil and gas in the Guantao formation, but reservoir sands with the thickness less than 5 meters could not be resolved and interpreted precisely.Recognition that the source direction in the sedimentary period of Guantao formation is northeast, fluvial to shallow water delta facies were developed which was made by comprehensive utilization of drilling cores, the data of sporopollen and algae, logging and 3-D seismic data.90°phasing adjusted seismic wavelet phase to -90°to tie seismic events to lithology.Frequency division was used to interpret, treat and judge phase axis following relative geologic time surfaces to establish high-frequency, sequence stratigraphic framework and optimized 60 Hz dominant frequency seismic data for stratal slicing.Stratal slicing made from the 3-D seismic volume revealed better facies information on the relative geologic time surfaces.With the interpretation of sand body depositional features displayed on each sequence stratal slice, it could be found that sedimentary evolution process in the study area was divided into four stages: fluvial facies stage, sheet-like shallow water delta stage, lobate shallow water delta stage and distributary channel shallow water delta stage.And it also could be found that the sand body mainly developed horizontally in the north of the study area, and the position of fluvial channels and shallow water delta front provided good areas for oil and gas exploration.This study case proved that the method of seismic sedimentology is suitable for thin sandstone reservoir prediction in Bohai basin.
- seismic sedimentology /
- Bohai basin /
- fluvial to shallow water delta facies /
- reservoir prediction /
- Guantao formation

HTML全文

图 1 蓬莱A构造区地理位置图

Figure 1. Geographic location ofthe Penglai A structure area

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图 2 蓬莱A构造区馆陶组层序地层格架

Figure 2. Sequence stratigraphic frameworkof Guantao Formation in the Penglai A structure area

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图 3 渤海海域周缘水系划分示意图(据文献[49])

Figure 3. Division of water system Bohai sea area

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图 4 渤东地区馆陶组岩屑组分相对体积分数分布图

Figure 4. Lithological difference distribution of Guantao Formation in Bodong area

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图 5 渤东地区馆陶组古地貌图与蓬莱A构造区各层序古地貌图

Figure 5. Paleogeomorphic map of Guantao formation in Bodong area and each sequence in the Penglai A structure area

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图 6 蓬莱A构造区馆陶组连井沉积相分析

Figure 6. Sedimentary facies analysis of the connecting-well profiles of Guantao Formation in the Penglai A structure area

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图 7 蓬莱A构造区馆陶组典型岩心照片

a.PLA-4井，1 260 m，正交光; b.PLA-2井，1 074.7 m，单偏光，蓝色铸体; c.PLA-1井，1 058 m，壁心; d.PLA-2井，1 074.6~1 074.7 m，岩心

Figure 7. Core photos of Guantao Formation in the Penglai A structure area

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图 8 蓬莱A构造区馆陶组-90°相位转换前后地震同相轴对应关系对比

Figure 8. Comparison between 0°phase seismic section and -90°seismic section of Guantao Formation in the Penglai A structure area

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图 9 蓬莱A构造区馆陶组在不同频段地震体的显示

Figure 9. Seismic reflection characteristics of different frequency seismic volume of Guantao Formation in the Penglai A structure area

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图 10 蓬莱A构造区馆陶组各层序典型地层切片

Figure 10. Typical strata slicing of Guantao Formation in the Penglai A structure area

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图 11 蓬莱A构造区馆陶组各层序典型地层切片沉积相解释

Figure 11. Sedimentary facies interpretation on typical strata slicing of Guantao Formation in the Penglai A structure area

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