水道浊积体特征识别模式及其储层地震预测——以西非下刚果盆地MC块为例

doi:10.11720/wtyht.2025.0032

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摘要

西非下刚果盆地深水区发育典型水道浊流体系,是深水油气勘探的重点区域。该区浊积体具有非均质性强、储层展布复杂的特点。传统方法在浊积体识别精度和储层预测能力上存在不足,难以满足高效勘探需求。本研究基于深水重力流理论,以西非下刚果盆地深水区水道浊流体系为对象,依据浊积作用发育部位、可容空间形态及浊积体内幕特征,结合钻井揭示的岩石相、测井相以及地震相等综合建立了4类不同尺度水道浊积体的特征识别模式;进一步以相带控储为基础,基于改进的射线弹性阻抗反演方法构建了新的复合弹性参数,使其对浊积砂岩储层具有更佳的分辨能力,从而实现了浊积砂岩储层的定量预测。经后验井检验精度较高,应用效果好,为该类深水区油气资源评价、井位部署提供了重要依据。

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	高君
	徐睿
	黄家宸
	苑书金

关键词 ：水道浊积体, 特征识别模式, 浊积砂岩, 射线弹性反演, 复合弹性参数, 储层预测

Abstract：

A typical channel turbidite system is developed in the deep-water area of the Lower Congo Basin,West Africa,establishing this area as a significant target for deep-water oil and gas exploration.Turbidite bodies in this area are characterized by strong heterogeneity and a complex reservoir distribution.Traditional methods show limited turbidite body identification accuracy and reservoir prediction ability,failing to support efficient exploration.This study investigated the channel turbidite system in this area based on the deep-water gravity flow theory.It established feature identification models for four kinds of channel turbidites at different scales.The models integrate the turbidite depositional site,accommodation space geometry,internal turbidite characteristics,and the rock,log,and seismic facies obtained through drilling.Furthermore,guided by the principle of facies-controlled reservoir distribution,new composite elastic parameters were constructed based on an improved ray-path elastic impedance inversion method.These parameters provided enhanced resolution for turbidite sandstone reservoirs,enabling a quantitative prediction of such reservoirs.Validation with post-test wells demonstrates high accuracy and favorable application outcomes.Overall,this study serves as a foundational guide for oil and gas resource assessments and well placement in similar deep-water areas.

Key words： channel turbidite body feature identification model turbidite sandstone ray-path elastic impedance inversion composite elastic parameter reservoir prediction

收稿日期: 2025-02-24 修回日期: 2025-06-10 出版日期: 2025-08-20

ZTFLH:

P631.4

基金资助:“十三五”国家重大专项“南大西洋两岸重点盆地油气勘探开发关键技术”(2016ZX05033-02)

作者简介: 高君(1966-),男,博士,教授级高级工程师,长期从事地震地质综合研究工作。

引用本文:

高君, 徐睿, 黄家宸, 苑书金. 水道浊积体特征识别模式及其储层地震预测——以西非下刚果盆地MC块为例[J]. 物探与化探, 2025, 49(4): 919-924.
GAO Jun, XU Rui, HUANG Jia-Chen, YUAN Shu-Jin. Feature identification model and seismic reservoir prediction of channel turbidite bodies: A case study of the MC block,Lower Congo Basin,West Africa. Geophysical and Geochemical Exploration, 2025, 49(4): 919-924.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2025.0032 或 https://www.wutanyuhuatan.com/CN/Y2025/V49/I4/919

Fig.1 浊积岩体特征识别技术流程

Fig.2 安哥拉海域水道浊积体特征模式

Fig.3 地震分频体RGB融合属性图及C-n1井岩性剖面
a—近东西向反射地震剖面;b—地震分频RGB融合属性;c—过井地层岩性剖面

Fig.4 射线弹性阻抗反演剖面

Fig.5 射线弹性阻抗交会构建新的AVO弹性阻抗

Fig.6 基于射线弹性反演的f_AVO-IMP浊积砂储层厚度预测(a)和孔隙度预测(b)

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