滨里海盆地东缘中石炭统台内滩分布预测及甄别: 以北特鲁瓦斜坡区为例

徐辰浩; 梁治国; 程俊生

doi:10.19509/j.cnki.dzkq.2021.0604

滨里海盆地东缘中石炭统台内滩分布预测及甄别: 以北特鲁瓦斜坡区为例

doi: 10.19509/j.cnki.dzkq.2021.0604

详细信息

作者简介:
徐辰浩(1986-), 男, 工程师, 主要从事地质勘探方面的研究工作。E-mail: xuch.gwdc@cnpc.com.cn

中图分类号: P53
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出版历程
- 收稿日期: 2021-02-26

Prediction and discrimination of the Middle Carboniferous inner platform shoal distribution at the eastern margin of Pre-Caspian Basin: Taking the North Truwa slope area as an example

摘要

摘要: 滨里海盆地东缘中石炭统KT-Ⅱ油组广泛发育开阔台地相的台内滩，台地内沉积环境开阔且稳定，地势平坦，台内滩往往呈孤立状漂浮在台地内的微地貌高地，故其分布规律难以预测。钻探实践表明，台内滩相是后期发生建设性成岩改造作用的基础，亦是形成优质储层的主控因素，对其分布进行预测至关重要。为了提高滩体预测准确率，立足于区域沉积演化分析，并逐步开展三维地震属性分析及高分辨率反演，充分结合地震资料的预测性和地质认识的规律性，通过总结相带地质规律对地震储层预测进行补充和甄别，做到地质和地球物理认识上的统一。研究结果表明，地震属性趋势控制下的统计学反演可以较准确地刻画小层级别的薄层滩体空间分布特征。结合沉积规律对预测滩体进行了筛选和分类，其中一类滩体7个，二类滩体4个，三类滩体3个，一类、二类滩体已有钻井证实，符合沉积规律，三类滩体与地质认识相悖，予以筛除。研究成果建立了该区隐蔽型滩体预测的完整技术体系，而且已见到实效，目前针对一类滩体的钻探成功率高达100%。
- 滨里海东缘 /
- 台内滩 /
- 沉积微相 /
- 两宽一高资料 /
- 地质统计学反演 /
- 多属性
Abstract: The Middle Carboniferous KT-Ⅱoil formation in the eastern margin of the Pre-Caspian Basin is widely developed with open platform facies intra platform beach.The sedimentary environment is open and stable, and the terrain is flat.The intra platform beach often floats in isolated micro geomorphic Highlands in the platform, so its distribution is often difficult to predict.Drilling practice shows that the beach facies in the platform is the basis of constructive diagenesis in the later stage, and it is also the main controlling factor for the formation of high-quality reservoir, so it is very important to predict its distribution.In order to improve the accuracy of beach prediction, based on the analysis of regional sedimentary evolution, and gradually carry out three-dimensional seismic attribute analysis and high-resolution inversion, fully combined with the predictability of seismic data and the regularity of geological knowledge, through summing up the geological law of facies belt, the seismic reservoir prediction is supplemented and screened, so as to achieve the unity of geological and geophysical knowledge.The results show that the statistical inversion under the control of seismic attribute trend can accurately describe the spatial distribution characteristics of thin beach body at the level of small layer.According to the sedimentary law, the predicted beach bodies are screened and classified.Among them, there are 7 first-class beach bodies, 4 second-class beach bodies and 3 third-class beach bodies.The first- and second- class beach bodies have been confirmed by drilling, which are consistent with the sedimentary law.The third-class beach bodies are contrary to the geological understanding and should be screened out.The research results have established a complete technical system for the prediction of concealed beach bodies in this area, and have seen actual results.At present, the success rate of drilling for a class of beach bodies is as high as 100%.
- eastern margin of Pre-Caspian Basin /
- inner platform shoal /
- sedimentary microfacies /
- wide azimuth and high density acquisition /
- geostatistical inversion /
- multi-attribute

HTML全文

图 1 滨里海盆地构造单元及研究区位置图

Figure 1. Structural units of Pre-Caspian Basin and the location of the study area

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图 2 北特鲁瓦KT-Ⅱ层主要岩石类型

a.亮晶有孔虫灰岩，b22井，3 151 m，绿藻、有孔虫分布欠均匀，见生物扰动构造，孔隙以粒间溶孔为主，次为体腔孔；b.亮晶藻骨架灰岩，b4井，3 185.5 m，颗粒以大量原地生成的红、绿藻为主，并组成骨架结构，面孔率达23；c.亮晶藻团块灰岩，b4井，3 124.7 m，藻团块粗大，黏结类、有孔虫、腹足类、红藻等碎片，孔隙不发育，面孔率仅4.3%；d. 亮晶包粒灰岩，b22井，3 208 m，颗粒以藻包粒为主，另见少量红藻，包粒粗大，大部分粒径达粗至砾级，孔隙不发育；e.泥晶生屑灰岩，b4井，3 094 m，生物以有孔虫碎片为主，保存很差，含少量尖角状的陆源石英和鞍山岩喷出岩岩屑；f.泥晶泥灰岩，b4井，3 134 m，结构极细的泥灰质中含少量生屑，破碎极强，富含黏土质，含分散或聚集的黄铁矿较多，并有氧化作用

Figure 2. Main rock types of KT-Ⅱ layer in North Truwa

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图 3 KT-Ⅱ段沉积微相特征

Figure 3. Sedimentary microfacies of KT -Ⅱlayer

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图 4 KT-Ⅱ段主力小层沉积微相平面图

Figure 4. Sedimentary microfacies plan of main sublayer in KT -Ⅱ layer

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图 5 KT-Ⅱ段沉积微相剖面对比图(剖面分布位置见图 4-a)

Figure 5. Section comparison of sedimentary microfacies in KT -Ⅱlayer

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图 6 目的层段地震资料频谱

Figure 6. Seismic data spectrum of target interval

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图 7 KT-Ⅱ岩相分类纵波阻抗直方图

Figure 7. P-wave impedance histogram of different lithofacies in KT-Ⅱ layer

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图 8 b66井井震标定及目的层反射特征

Figure 8. Well-to-Seismic calibration of Well b66 and reflection characteristics of target layer

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图 9 谱分解属性平面图

Figure 9. Plan of spectral decomposition attribute

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图 10 滩体分布预测流程图

Figure 10. Flow chart of beach prediction

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图 11 反演孔隙度过井剖面图(a)及对应油藏剖面图(b)

Figure 11. Inversion porosity cross well section (a) and corresponding reservoir section (b)

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图 12 统计学反演预测Γ₂小层储层厚度图

Figure 12. Thickness map of Γ₂ sublayer from geostatistical inversion prediction

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图 13 Γ₂小层滩相储层筛选成果图

Figure 13. Screening results of beach facies reservoir in Γ₂ sublayer

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