玛湖凹陷风城组复杂岩性组合横波预测方法探索  

Exploring the shear-wave prediction method for complex lithologic assemblages of the Fengcheng Formation in the Mahu sag

作　　者：钟厚财 刘振宇 朱哲 屈琳 张珊 姚燕飞 范蓉蓉 ZHONG Hou-Cai;LIU Zhen-Yu;ZHU Zhe;QU Lin;ZHANG Shan;YAO Yan-Fei;FAN Rong-Rong(Urumqi Branch,Geophysical Research Institute,BGP,CNPC,Urumqi 830016,China;Geophysical Technology Research and Development Center,BGP,CNPC,Zhuozhou 072750,China)

机构地区：[1]中国石油集团东方地球物理公司研究院乌鲁木齐分院,新疆乌鲁木齐830016 [2]中国石油集团东方地球物理公司物探技术研发中心,河北涿州072750

出　　处：《物探与化探》2024年第3期736-746,共11页Geophysical and Geochemical Exploration

基　　金：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)。

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。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.

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 

分 类 号：P631.4[天文地球—地质矿产勘探]