针对玄武岩屏蔽作用下的地质目标地震采集技术研究——以冰岛M区块为例

doi:10.3969/j.issn.1672-7703.2017.04.012

摘要/Abstract

摘要： 冰岛M区块内存在两套覆盖范围较广、厚度大的玄武岩，其强烈的屏蔽作用使得该区采集难度很大，以往采集得到的资料整体信噪比低，下伏地层基本无反射信号。为了获得该地区更好的地震资料，特别是获取玄武岩强屏蔽层下伏的中、深层地震信息，通过分析采集难点，经关键参数论证和技术研究，设计出满足地质目标的斜缆采集方式，保证了采集频宽，配合低频、大容量震源，提高了地震信号的穿透能力，得到了高品质地震资料，最终形成了一套针对玄武岩屏蔽作用下的地质目标地震采集技术方法。

关键词: 玄武岩屏蔽, 地震采集, 低频大容量, 倾斜电缆, 信噪比

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)

中图分类号:

P631.4

胡兴豪, 宋建国, 帅鹏宇. 针对玄武岩屏蔽作用下的地质目标地震采集技术研究——以冰岛M区块为例[J]. 中国石油勘探, 2017, 22(4): 116-122.

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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