水平井地震导向技术探索与应用——以四川盆地复杂地区页岩气井为例

doi:10.11720/wtyht.2021.1109

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Abstract

The Silurian Longmaxi Formation shale in the south of Sichuan Basin has the geological characteristics of large burial depth (more than 3000 meters), thin thickness of high-quality shale section,rapid change of formation dip angle,and development of micro structure and micro fracture.It is difficult for the traditional geosteering technology to accurately identify the target location of the longitudinal sweet spot.During the drilling process of horizontal section,there is a high risk of target miss target and formation production.The 3D seismic data can provide guidance for sidetracking and target entry of horizontal wells and guide horizontal drilling.Taking the seismic tracking of shale gas horizontal wells in the complex area of southern Sichuan Basin as an example,this paper introduces a new idea of horizontal well seismic guidance technology based on anisotropic prestack depth migration three-dimensional data volume.Based on high-precision imaging data and considering regional velocity field background,geological constraint velocity modeling ensures accurate target and,at the same time,real-time anisotropic depth migration of target block can be carried out.In addition,real-time seismic tracking during drilling can effectively help drilling geosteering and provide early warning and adjustment scheme for drilling engineering.The actual drilling shows that the seismic steering technology for horizontal wells in shale gas complex structural areas can effectively improve the effective reservoir drilling rate of horizontal wells for development and engineering needs.

Key words： shale gas horizontal well seismic guidance anisotropic depth migration

Received: 21 August 2020 Published: 27 July 2021

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	Articles by authors
	Ju-Gang OU
	Xiao-Lan WANG
	Xiao YANG
	Xiao-Jiang DENG
	Cheng HUANG
	Wen-Jia LI

Cite this article:

Ju-Gang OU,Xiao-Lan WANG,Xiao YANG, et al. The exploration and application of horizontal well seismic guidance technology:A case study of shale wells in the complex area of Sichuan basin[J]. Geophysical and Geochemical Exploration, 2021, 45(3): 551-559.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1109 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I3/551

Comprehensive histogram of sub-layer division among Wufeng Formation and Long-1 subsection of typical evaluation wells in Changning and Weiyuan

Geological steering engineering figure of X horizontal well

Horizontal seismic guidance technology flow based on anisotropic prestack depth migration data of target block

Fast processing flow chart of real time tracking prestack depth in drilling process

Comparison of well-seismic error constrained by layer thickness(single well)

Comparison between regular and constrained anisotropy depth migration
a—regular anisotropic prestack depth migration profile;b—anisotropic prestack depth migration profile constrained by layer thickness

Fractures prediction overlay depth profile of X design well trajectory in Luzhou area

Fractures prediction overlay depth profile of X well before entering the target

Fractures prediction overlay depth profile of X well after updating velocity field

The formation dip mistie between actual drilling and the seismic prediction during drilling
a—drilling engineering;b—overlapping diagram of real drilling trajectory and seismic profile

Fractures prediction overlay the ant body profile of X well after anisotropic depth migration
a—drilling engineering;b—overlapping diagram of real drilling trajectory and seismic profile

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