Near-Surface Azimuthal Anisotropy and Seismic Imaging in the Southern Margin of Junggar Basin

doi:10.7657/XJPG20210114

Abstract

Abstract:

The Anjihai anticline in the southern margin of the Junggar basin is a typical complex oil exploration area where the near-surface heterogeneity is very strong, lithology changes fiercely, and the velocity of the weathered layer changes greatly. The complex near-surface shooting and receiving conditions change the path and velocity of seismic waves and result in serious near-surface azimuthal anisotropy, making effective seismic waves (events) not be superimposed. The accurate imaging of complex structure is the first problem to be solved in seismic processing. This study analyzed the characteristics of the first arrivals of original source points, and described the correspondence between gathers after NMO/static correction and source and receiver points based on geological outcrops and satellite images, and then built the close relationship with various gullies and near-surface medium lithology, and finally established the weighted coefficient fields of different azimuth through azimuthal NMO/static correction and azimuthal weighted pre-stack time migration imaging, so that the arcing phenomenon in pre-stack time migration can be obviously suppressed, and the final migration imaging quality can be significantly improved. Using the results of pre-stack time migration, the middle and lower trap combinations in the Anjihai anticline have been effectively identified.

Key words: Junggar basin, Anjihai anticline, azimuthal anisotropy, seismic imaging, pre-stack time migration, geological outcrop, satellite image, weighted coefficient

CLC Number:

P631.443

LUO Yong, TAN Jia, YANG Xiaohai, DOU Qiangfeng, LIU Yiwen. Near-Surface Azimuthal Anisotropy and Seismic Imaging in the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2021, 42(1): 100-106.

Figures/Tables 7

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig.5.

Fig. 6.

Fig. 7.

References 15

[1]	娄兵, 罗勇, 范旭 , 等. 准噶尔盆地南缘复杂构造地震成像方法与实践[M]. 北京: 石油工业出版社, 2019: 72-173.
	LOU Bing, LUO Yong, FAN Xu , et al. Methods and practice of seismic imaging of complex structures in southern margin of Junggar basin[M]. Beijing: Petroleum Industry Press, 2019: 72-173.
[2]	白旭明, 崔宏良, 袁胜辉 , 等. 近地表各向异性调查研究[ C]//石油地球物理勘探:中国石油学会2015年物探技术研讨会论文集. 河北涿州:石油地球物理勘探, 2015: 309-311.
	BAI Xuming, CUI Hongliang, YUAN Shenghui , et al. Near surface anisotropy survey[C]// Oil Geophysical Prospecting:2015 Geophysical Technology Symposium,Chinese Petroleum Society. Zhuozhou,Hebei:Oil Geophysical Prospecting, 2015: 309-311.
[3]	宁宏晓, 何永清, 唐海忠 , 等. 山前带近地表速度各向异性成因分析与调查[C]// 石油地球物理勘探:中国石油学会2017年物探技术研讨会论文集. 河北涿州:石油地球物理勘探, 2017: 121-123.
	NING Hongxiao, HE Yongqing, TANG Haizhong , et al. Genetic analysis and investigation of the near surface velocity anisotropy of the piedmont zone[C]// Oil Geophysical Prospecting:2017 Geophysical Technology Symposium,Chinese Petroleum Society. Zhuozhou,Hebei:Oil Geophysical Prospecting, 2017: 121-123.
[4]	陈志德, 初海红, 刘津冶 . 长垣油田地震资料各向异性时差分析与校正[J]. 石油学报, 2014,35(3):486-495.
	CHEN Zhide, CHU Haihong, LIU Jinye . Analysis and correction of anisotropy azimuth time delay for seismic data in Changyuan oilfield[J]. Acta Petrolei Sinica, 2014,35(3):486-495.
[5]	刁文川, 刘哲生, 蔡希玲 , 等. 浅述地震各向异性[J]. 石油地球物理勘探, 2007,42(增刊):106-110.
	DIAO Wenchuan, LIU Zhesheng, CAI Xiling , et al. Brief talk about seismic anisotropy[J]. Oil Geophysical Prospecting, 2007,42(Supp.):106-110.
[6]	邓勇, 陈鹏, 张鑫 , 等. 准噶尔盆地南缘浅表层砾岩层成因及分布特征[J]. 新疆石油地质, 2020,41(1):93-99.
	DENG Yong, CHEN Peng, ZHANG Xin , et al. Genesis and distribution of shallow conglomerates in the southern margin of Junggarbasin[J]. Xinjiang Petroleum Geology, 2020,41(1):93-99.
[7]	陆基孟 . 地震勘探原理[M]. 山东东营: 石油大学出版社, 1993.
	LU Jimeng. Principle of seismic exploration[M]. Dongying, Shandong:China University of Petroleum Press, 1993.
[8]	徐常练 . 速度分析中的CMP叠加道同相求和[J]. 石油地球物理勘探, 1993,28(4):471-476.
	XU Changlian . Inphase summation of CMP stack traces in velocity analysis[J]. Oil Geophysical Prospecting, 1993,28(4):471-476.
[9]	龚明平, 张军华, 王延光 , 等. 分方位地震勘探研究现状及进展[J]. 石油地球物理勘探, 2018,53(3):642-658.
	GONG Mingping, ZHANG Junhua, WANG Yanguang , et al. Current situations and recent progress in different azimuths seismic exploration[J]. Oil Geophysical Prospecting, 2018,53(3):642-658.
[10]	段文胜, 李飞, 王彦春 , 等. 面向宽方位地震处理的炮检距向量片技术[J]. 石油地球物理勘探, 2013,48(2):206-213.
	DUAN Wensheng, LI Fei, WANG Yanchun , et al. A vector slice technique for wide azimuth seismic processing[J]. Oil Geophysical Prospecting, 2013,48(2):206-213.
[11]	张志让, 张振平 . 一种减少偏移画弧的方法:同相叠加[J]. 石油地球物理勘探, 1999,34(4):436-441.
	ZHANG Zhirang, ZHANG Zhenping . In-phase stacking:a method to reduce arc phenomenon in seismic migration[J]. Oil Geophysical Prospecting, 1999,34(4):436-441.
[12]	张军华, 朱焕, 郑旭刚 , 等. 宽方位角地震勘探技术评述[J]. 石油地球物理勘探, 2007,42(5):603-609.
	ZHANG Junhua, ZHU Huan, ZHENG Xugang , et al. Summary of wide-azimuth seismic exploration technique[J]. Oil Geophysical Prospecting, 2007,42(5):603-609.
[13]	王华忠, 刘少勇, 杨勤勇 , 等. 山前带地震勘探策略与成像处理方法[J]. 石油地球物理勘探, 2013,48(1):151-159.
	WANG Huazhong, LIU Shaoyong, YANG Qinyong , et al. Seismic exploration strategy and image processing in mountain areas[J]. Oil Geophysical Prospecting, 2013,48(1):151-159.
[14]	娄兵, 姚茂敏, 罗勇 , 等. 高密度宽方位地震数据处理技术在玛湖凹陷的应用[J]. 新疆石油地质, 2015,36(2):208-213.
	LOU Bing, YAO Maomin, LUO Yong , et al. Application of high density and wide azimuth seismic data processing technology in Mahu depression[J]. Xinjiang Petroleum Geology, 2015,36(2):208-213.
[15]	黄丽娟, 罗文山, 方勇 , 等. 天山南北复杂构造成像技术进展及应用效果[J]. 新疆石油地质, 2020,41(1):114-119.
	HUANG Lijuan, LUO Wenshan, FANG Yong , et al. Progress and application of imaging technology for complex structures in the southern and northern Tianshan mountains[J]. Xinjiang Petroleum Geology, 2020,41(1):114-119.