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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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

Received: 06 May 2019 Published: 28 November 2019

P631.4

Corresponding Authors: Xiao LIU E-mail: sea_251@163.com

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	Hui ZHOU
	Yu-Kun TIAN
	Xiao LIU
	Juan LI
	Yan-Yan MA

Cite this article:

Hui ZHOU,Yu-Kun TIAN,Xiao LIU, et al. The application of low frequency seismic identification technology to deep Carboniferous volcanic rocks in Wulungu depression[J]. Geophysical and Geochemical Exploration, 2019, 43(6): 1217-1224.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0252 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I6/1217

Structural location of the study area

Spectrum of new and old seismic profiles
a—previous seismic profiles;b—new seismic profiles;c—frequency spectrum contrast map of new and old profiles;d—location map of survey line

Frequency-division scanning stack profiles of low-frequency seismic exploration
a—2~4 Hz;b—4~8 Hz;c—8~15 Hz;d—15~30 Hz;e—30~60 Hz;f—50~100 Hz

Structural framework(4~15 Hz,stacked section)
①—envelope surface of rock mass;②—fault surface wav;③—sedimentary stratum;④—rotating wave

Structural interpretation profile(Post-stack time migration profile)
①—envelope surface of rock mass;②—faults;③—sedimentary strata of carboniferous;④—mesozoic bottom boundary

Logging curve cross plot

Seismic reflection characteristics of volcanic rocks
①—Strong impedance interface of volcanic rock mass contour;②—Chaotic reflections in volcanic rocks;③—angular unconformity between volcanic rock mass and surrounding rock;④—sedimentary rock strata

Seismic reflection characteristics of volcanic facies
①—volcanic sedimentary facies;②—overflow facies

Seismic attribute recognition of volcanic rock mass
①—volcanic rock mass;②—volcanic passage

Prediction of volcanic rock distribution range in research area

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