彭水地区碳酸盐岩山地地表地震激发接收因素优选及效果

doi:10.11720/wtyht.2022.1251

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Abstract

The Pengshui area,located in the Wuling fold belt at the southeast margin of Sichuan Basin,has a typical karst mountain landform and very complex near-surface structures.Such a geological setting leads to a poor seismic acquisition effect and a low signal to noise ratio (SNR),which seriously affects the oil and gas exploration in this area.This study carried out the excitation tests and research,such as charge type,excitation mode,excitation well depth,and excitation dose,as well as receiving tests on interference wave investigation and geophone types and their combination means on the ground surface in the mountainous areas with exposed carbonate rocks.Furthermore,this study selected a set of excitation and receiving parameters with a strong economy and maneuverability and established the technology used to determine the optimal excitation point location for complex mountainous terrain.Compared with the previous data,this study achieved significantly improved energy,SNR,and first-grade product rate of the newly acquired single-shot records.Moreover,the new data processing profiles obtained in this study show rich information,clear reflection characteristics,and high SNR and display a distinct seismic tectonic pattern of carbonate rock area.

Key words： Pengshui area carbonate surface seismic acquisition excitation and receive SNR

Received: 14 May 2021 Published: 21 June 2022

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	Articles by authors
	Ye XUE
	Fan YANG
	Hou-Yu LIU
	Ming LIU
	Su-Cheng ZHAO
	Jia-Da LAN

Cite this article:

Ye XUE,Fan YANG,Hou-Yu LIU, et al. Determination of the optimal factors of seismic excitation and reception on the ground surface of carbonate mountainous areas in Pengshui area and its seismic acquisition effects[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 608-617.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1251 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/608

Comparison of single shot excitation record and spectrum analysis between emulsion explosive and nitroammonia explosive

Comparison of 2D Seismic profile between emulsion explosive(a) and nitroammonia explosive(b)

Comparison of single shot excitation records between single well and combined well

Comparison of excitation effects of different charges on carbonate surface

Comparison of excitation effects of different well depths on carbonate surface

Comparison of single-shot records excited on different terrain in Pengshui area

Noise parameters

Comparison between of single-shoot records (10~50 Hz) received by analog geophones and digital geophones
a—single shot record received by analog geophones array;b—single shot record received by digital geophones array

Comparison of receiving profiles of different combinations of surface analog geophones in carbonate rocks
a—rectangle 6×4 combined receiving profile;b—concentric combined receiving profile;c—rectangle 8×3 combined receiving profile

Comparison of receiving records of different series combinations of surface analog geophones in carbonate rocks
a—receiving record of double string analog geophone;b—receiving record of single string analog geophone

Comparison of records between wireless nodes(a) and conventional wireline system(b)

Comparison of the single-shoot records of seismic acquisition before and after optimization of excitation and receiving parameters
a—original acquisition single shot;b—single-shoot records of seismic acquisition after optimization

2D seismic profile comparison at the same location before and after the optimization of excitation and receiving parameters
a—processing 2D section by pre-seismic acquisition data;b—processing 2D section by seismic acquisition after the optimization of excitation and receiving parameters

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