分频AVO技术在安岳气田须二段储层含气性分析中的应用

doi:10.11720/wtyht.2023.1273

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Abstract

The second member of the Xujiahe Formation (the Xu-2 Member) in the Anyue area of the Sichuan Basin enjoys abundant tight gas reserves.However,this member has complex geological characteristics,and conventional amplitude versus offset (AVO) analysis has relatively low precision in predicting the gas-bearing property of the reservoir in this member.Therefore,it is necessary to develop a more fine-scale seismic prediction method. Based on the analysis of single-well petrophysical characteristics and forward models,the AVO attributes of the dominant frequency range were selected through the frequency division AVO inversion based on wavelet transform.Then,these AVO attributes were fused to form the gas-bearing indicator,using which the distribution of favorable gas-enrichment zones in the Xu-2 Member of the Anyue area was predicted.The results are as follows:The gas zones in the Xu-2 Member primarily present class IV AVO anomalies;For the gas and water zones,their AVO responses in the dominant frequency range (35~45 Hz) differed significantly from those in the full frequency band,and their gas-bearing response characteristics were more pronounced in the dominant frequency range;The AVO attributes sensitive to the gas-bearing property included the difference in the S-wave velocity,the difference in Poisson's ratio, and the fluid factor.The gas-bearing indicator was obtained through the fusion of these AVO attributes,and the negative anomalies of the gas-bearing indicator were indicative of favorable gas-bearing zones;The seismic-log correlation shows that the AVO attributes in the dominant frequency range yielded positive gas-bearing prediction effects.The method proposed in this study is expected to provide technical support for unconventional oil and gas exploration.

Key words： frequency division AVO wavelet transform dominant frequency tight gas sandstone reservoir prediction

Received: 04 June 2022 Published: 05 July 2023

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	Articles by authors
	Chen SONG
	Ji-Neng JIN
	Ren-Fang PAN
	Bo-Yuan ZHU
	Zhi-Hua YU
	Xiao-Ling TANG

Cite this article:

Chen SONG,Ji-Neng JIN,Ren-Fang PAN, et al. Application of frequency division AVO in the gas-bearing analysis of reservoir in the Xu-2 Member of the Anyue gas field[J]. Geophysical and Geochemical Exploration, 2023, 47(3): 681-689.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1273 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I3/681

Spectrum difference diagram of sidetrack in reservoir with different fluid types

Seismic spectrum characteristics of typical gas and water layers

Forward modeling of well A and well B
a—logging curve and forward trace gather of well A;b—logging curve and forward trace gather of well B;c—AVO curve of well A;d—AVO curve of well B

P-G cross plot of multi well gas and water layer in the study area

Frequency division AVO curve of well A and well B
a—gas layer of well A;b—water layer of well B

Frequency division P-G cross plot of gas layer of well a and water layer of well B

Prestack seismic gathers passing through gas layer of well A(a) and water layer of well B(b)

Amplitude response characteristics of original prestack gathers of gas layer in well A(a) and water layer in well B(b)

35~45 Hz angle gathering through gas layer of well A(a) and water layer of well B(b)

Amplitude response curve of 35~45 Hz frequency divided data volume at the well side of gas layer of well A(a) and water layer of well B(b)

AVO属性	物理意义	计算公式
差异横波速度	反映出横波速度的变化率特征	$D V S = 1 + 0.25 k × C - 0.25 k × B - A$
差异密度	反映密度的变化率特征	$D D N = 2 A - C$
差异纵波速度	反映出纵波速度的变化率特征	$D V P = 2 C$
流体因子	显示与Castagna方程不符的含油气区	$F F = R p - 0.58 R s$
泊松比	反映岩层泊松比的变化特征	$P R = a × A + b × B$
横波反射系数	反映横波阻抗的特征	$R V S = a × A - b × B$

Physical meaning and formula of AVO attribute

Comparison of coincidence between AVO attribute and gas bearing response of multiple wells

Prediction profile of dominant frequency band with 35~45 Hz attribute of well Yue111—Yue118—Yue145 well

Plane comparison of DHI gas content prediction of upper sub member of Xujiahe formation 2

Comparison of abnormal response of AVO gas bearing property

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