玛湖凹陷风城组复杂岩性组合横波预测方法探索

doi:10.11720/wtyht.2024.1179

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摘要

玛湖凹陷二叠系风城组复杂岩性组合横波预测技术攻关是准确落实该区油气富集区的重点,也是难点,不同岩性分类型岩石物理建模技术攻关是核心。针对岩性类型多样、岩石矿物组分复杂的关键问题,开展不同岩性分类型岩石物理建模技术攻关。形成了基于复杂岩性“分层段、分岩性、分模型”的三分法横波速度预测技术和基于复杂岩石矿物组分“舍轻就重,同类合并”为原则的碱湖型云化致密储层干岩石骨架建立技术,并对比优选了自洽模型(self-consistent)开展了云化砂岩段储层的岩石物理建模横波计算。该技术的探索应用,在玛湖凹陷风城组复杂岩性组合横波预测及甜点储层预测中取得了较好的效果,为该区井位部署和储量落实提供了依据,为类似地区油气勘探积累了宝贵的经验。

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	钟厚财
	刘振宇
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	屈琳
	张珊
	姚燕飞
	范蓉蓉

关键词 ：岩石物理建模, 横波预测, 碱湖型, 致密储层, 复杂矿物, 玛湖凹陷

Abstract：

Research on shear-wave prediction for complex lithologic assemblages of the Permian Fengcheng Formation in the Mahu sag is critical but challenging for accurately identifying hydrocarbon accumulation zones in the sag.The key to the prediction is to make breakthroughs in petrophysical modeling based on different lithologies.Given various lithologic types and intricate mineral compositions,this study delved into petrophysical modeling based on different lithologies.Consequently,this study developed an interval-,lithology-,and model-specific shear-wave prediction technique for complex lithologies.Furthermore,it established a technique for building a dry rock matrix for alkali lake-type dolomitized tight reservoirs by highlighting the major rock mineral compositions and merging the same types of rock mineral compositions.Additionally,the self-consistent model was selected for shear-wave calculation in the petrophysical modeling of dolomitized sandstone reservoirs.These techniques have been applied in the Fengcheng Formation of the Mahu Sag,achieving encouraging application results in both the shear-wave prediction of complex lithologic assemblages and the prediction of sweet spots.This study will provide a basis for well deployment and reserves determination in the area and offer valuable experience for oil and gas exploration in similar areas.

Key words： petrophysical modeling shear-wave prediction alkali lake type tight reservoir complex mineral Mahu sag

收稿日期: 2023-05-05 修回日期: 2024-02-20 出版日期: 2024-06-20

ZTFLH:

P631.4

基金资助:中国石油东方地球物理勘探有限责任公司重大科技项目(03-02-2022)

作者简介: 钟厚财(1986-),男,2009年毕业于西南石油大学勘查技术与工程专业,主要从事地震资料综合解释与物探方法研究工作。Email:zhonghouc02@cnpc.com.cn

引用本文:

钟厚财, 刘振宇, 朱哲, 屈琳, 张珊, 姚燕飞, 范蓉蓉. 玛湖凹陷风城组复杂岩性组合横波预测方法探索[J]. 物探与化探, 2024, 48(3): 736-746.
ZHONG Hou-Cai, LIU Zhen-Yu, ZHU Zhe, QU Lin, ZHANG Shan, YAO Yan-Fei, FAN Rong-Rong. Exploring the shear-wave prediction method for complex lithologic assemblages of the Fengcheng Formation in the Mahu sag. Geophysical and Geochemical Exploration, 2024, 48(3): 736-746.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1179 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I3/736

Fig.1 复杂岩性组合横波预测流程

Fig.2 玛湖凹陷典型井风城组火山岩岩芯及岩石薄片

Fig.3 MH025井火山岩段横波速度预测结果

Fig.4 玛湖凹陷典型井风城组砂砾岩岩芯及岩石薄片

Fig.5 MH025井砂砾岩段模型横波预测结果

Fig.6 玛湖凹陷典型井风城组云化砂岩岩芯及岩石薄片照片

Fig.7 云化砂岩储层多矿物简化分析

Fig.8 MH025井云化砂岩段横波速度预测结果

Fig.9 MH025井全井段横波速度预测结果

Fig.10 玛南斜坡风城组预测横波与实测横波交会

Fig.11 玛南斜坡纵横波速度比反演剖面

Fig.12 玛南斜坡纵横波速度比反演平面
a—砂砾岩储层;b—火山岩储层;c—云化砂岩储层

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