面向数据的AVO分析思路

基金项目: Sonangol Sinopec Internation安哥拉石油区块目标评价及勘探部署研究项目

Data Oriented AVO Analysis

Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan 430074, China

摘要: 国外石油公司在安哥拉深水区寻找古近系和新近系浊积砂岩油藏的勘探实践过程中, 使用AVO属性分析进行烃类检测取得了很高的成功率, 但也有一些区块遇到了与传统的AVO解释模板不一致的例子.通过对研究工区地震数据的分析, 利用精细的地震AVO正演模拟, 认识了含油砂岩的AVO响应特征, 并提出了相应的AVO交汇解释思路, 辅助含油气信息的检测.
- AVO分析 /
- AVO正演 /
- 交汇解释 /
- 石油地质
Abstract: AVO analysis has been successful with many cases in hydrocarbon detection in Tertiary turbidite reservoir in Angola deep water region. But there were some failed drilling cases relying on prospects from AVO study. Therefore, data oriented approach is proposed based on intensive analysis of seismic data, subtle rock physics study and forward modeling in order to improve hydrocarbon detection.
- amplitude versus offset analysis /
- amplitude versus offset forward /
- cross plot interpretation /
- petroleum geology

图 1 不同层段流体替换后的纵波、横波速度、密度及正演角道集

Fig. 1. P & S wave velocity, density and forward angle gathers of fluid replacement in different layers

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图 2 流体替换前后反射系数随偏移距的变化曲线

Fig. 2. Reflectivity changes with offset distance of before and after fluid replacement

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图 3 振幅随入射角的变化曲线

图中蓝色曲线是原始角道集的振幅曲线，红色曲线是AVO正演产生的模型数据的振幅曲线，绿色是经过剩余时差校正的角道集的振幅曲线，黑色曲线为超道集角道集的振幅曲线

Fig. 3. Reflectance changes with the angle of incidence curve

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图 4 AVO梯度、截距的分析

a和b均为测井数据分析

Fig. 4. AVO gradient and intercept analysis

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图 5 AVO解释模板

a.理论三类AVO解释模板；b.实际数据的解释模板

Fig. 5. AVO interpretation template

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图 6 实际数据的交汇解释模板

Fig. 6. Interpretation intersection template of real data

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图 7 有利目标的AVO异常剖面(a)和构造预测(b)

Fig. 7. AVO anomaly profile (a) and structure prediction (b) of favorable target

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