Seismic acquisition technology for geological targets under the shield of basalt:a case study on M Block,Iceland

doi:10.3969/j.issn.1672-7703.2017.04.012

Abstract

Abstract: There are two sets of thick basalts covering large areas within M Block, Iceland. Due to their strong shielding effect, the seismic acquisition in this block is rather difficult. The signal-to-noise ratio of previously acquired data is overall low with no reflected signal acquired from the underlying strata. To acquire efficient seismic data in this block, especially that of the middle and deep strata underlying the basalts, the inclined-cable acquisition mode subject to the geological targets was designed after the analysis of acquisition difficulties, key parameter demonstration and technical study. While guaranteeing the acquisition frequency width, this mode can combine with low-frequency largecapacity seismic source to improve the penetration capacity of seismic signals, thereby facilitating the acquisition of high-quality seismic data. A set of seismic acquisition technology for the geological targets under the shield of basalt is ultimately developed.

Key words: basalt shielding, seismic acquisition, low-frequency high-capacity, inclined cable, signal-to-noise ratio (SNR)

CLC Number:

P631.4

Hu Xinghao, Song Jianguo, Shuai Pengyu. Seismic acquisition technology for geological targets under the shield of basalt:a case study on M Block,Iceland[J]. China Petroleum Exploration, 2017, 22(4): 116-122.

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