乌伦古坳陷深层石炭系火山岩低频地震识别技术应用

doi:10.11720/wtyht.2019.0252

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摘要

乌伦古坳陷石炭系火山岩储层是准噶尔盆地油气勘探的重要目的层系,然而由于埋藏深,岩性复杂,受后期改造作用影响大,依靠以往二维地震勘探技术难以刻画火山岩体展布。文中以低频可控震源采集获得的地震资料为主,对乌伦古坳陷北部区域石炭系火山岩分布特征进行了研究。鉴于低频信息在地震深层成像方面的优势以及叠加剖面对构造趋势的良好反映,笔者利用低频段叠加剖面进行波场识别,指导偏移剖面解释,并将地质、地震、钻井资料相结合开展火山岩识别的研究,总结出了该区火山岩相的地震响应特征,综合利用地震反射特征和地震属性分析等手段,对火山岩体展布进行了识别刻画。本次研究探索了适用于深埋复杂岩性条件的火山岩储层低频地震识别方法,为该区石炭系油气勘探提供了一定的依据。

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	周惠
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	马彦彦

关键词 ：乌伦古坳陷, 石炭系, 火山岩, 低频勘探, 地震识别

Abstract：

The Carboniferous volcanic reservoir in Wulungu depression is an important target stratum for hydrocarbon exploration in Junggar Basin.However,due to its deep burial,complex lithology and strong late reformation,it is difficult to depict the distribution of volcanic rock masses by relying on the previous two-dimensional seismic exploration technology.Mainly based on the seismic data collected by low frequency vibroseis,the authors studied the distribution characteristics of Carboniferous volcanic rocks in the northern part of Wulungu depression.In view of the advantages of low-frequency information in deep-layer imaging and the good reflection of stacked section to structural trends,low-frequency stack section was used to identify wave field,which can guide migration section interpretation.Then by combining geological,seismic and drilling data,research on volcanic rock identification was carried out.The seismic response characteristics of volcanic facies in this area were summarized.The distribution of volcanic rocks was identified and characterized by means of seismic reflection characteristics and seismic attribute analysis.A low-frequency seismic identification method for volcanic reservoirs suitable for deep-buried complex lithologic conditions is explored.It provides a basis for Carboniferous oil and gas exploration in this area.

Key words： Wulungu depression Carboniferous volcanic rock low-frequency exploration seismic identification

收稿日期: 2019-05-06 出版日期: 2019-11-28

P631.4

基金资助:国家自然科学基金项目“基于裂缝—孔隙介质建模的储层参数预测和流体识别方法研究”(41774146);中国地质调查局项目“渝黔—滇桂地区页岩气战略选区调查”(DD20190108);国家重点研发计划项目子课题“超深层广角地震观测系统设计”(2016YFC060110305)

通讯作者: 刘晓

作者简介: 周惠(1983-),女,硕士研究生,工程师,主要从事地球物理资料处理解释和储层预测工作。Email:zhohui1125@163.com

引用本文:

周惠, 田玉昆, 刘晓, 李娟, 马彦彦. 乌伦古坳陷深层石炭系火山岩低频地震识别技术应用[J]. 物探与化探, 2019, 43(6): 1217-1224.
Hui ZHOU, Yu-Kun TIAN, Xiao LIU, Juan LI, Yan-Yan MA. The application of low frequency seismic identification technology to deep Carboniferous volcanic rocks in Wulungu depression. Geophysical and Geochemical Exploration, 2019, 43(6): 1217-1224.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0252 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I6/1217

Fig.1 研究区构造简图

Fig.2 新老地震剖面及频谱对比
a—以往地震剖面;b—新采集地震剖面;c—新老剖面频谱对比;d—测线位置

Fig.3 低频勘探地震剖面中深层分频扫描叠加剖面

Fig.4 构造格架搭建(4~15 Hz,叠加剖面)
①—岩体包络面;②—断面波;③—沉积地层;④—回转波

Fig.5 构造解释剖面(叠后时间偏移剖面)
①—岩体包络面;②—断层;③—石炭系沉积地层;④—中生代地层底界

Fig.6 测井曲线交会

Fig.7 火山岩体地震反射特征
①—火山岩体轮廓为强阻抗界面;②—火山岩体内部具有杂乱反射特征;③—火山岩体与围岩角度不整合接触关系;④—火山岩体下伏的沉积岩地层

Fig.8 火山相地震反射特征
①—火山沉积相;②—溢流相

Fig.9 火山岩体地震属性识别
①—火山岩体;②—火山通道

Fig.10 研究区火山岩体分布范围预测

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