东海南部二维地震勘探采集参数研究

Study on the Seismic Acquisition Parameters for South Area of East China Sea

罗鹰 唐建 马建德

LUO Ying TANG Jian MA Jiande

中国石化集团上海海洋石油局第一海洋地质调查大队, 上海 201208; 中国石油化工股份有限公司上海海洋油气分公司研究院, 上海 200120

Marine Geological Party, Shanghai offshore Petroleum Bureau, SINOPEC, Shanghai 201208, China; Institute of SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

东海南部油气勘探已有三十多年。经过多年研究认为,东海南部分布广泛的中生代沉积盆地具有较好的勘探前景。以往研究是以浅部新生界为主要目的层,地震采集参数存在电缆短、震源能量小、沉放深度浅等问题,获得的地震数据深部品质低。此文通过对该地区以往采集参数分析,地震剖面对比及主要参数的研究,制定了试验方案,并通过外业试验对比分析,确定了最终的采集参数,取得了良好的地震资料。研究结果表明,电缆拖带长度长(理论上最好9000 m),气枪容量大,电缆和震源的沉放深度深更有利于获得深部中生界的有效反射。

The petroleum exploration on the south area of East China Sea has lasted for more than 30 years. On the basis of the previous study results on this area for many years, it is believed that the hydrocarbon exploration potentials are great in widly spread Mesozoic sedimentary basins in this area. However, the target of previous study was at the Cenozoic strata, of which burial depth is relatively shallow. In addition, during the previous seismic surveys, some problems existed, for example, the streamer length was shorter, the volume of seismic source was smaller, and the depth of streamer and gun arrays was shallower. Accordingly, the quality of seismic profile was not good in deep strata. Through analysis on the previous seismic acquisition parameters in this area, the correlation of seismic profiles, the scenario for seismic acquisition parameters has been determinated. Through field testing, it has been proved that long streamer, huge gun volume and deep depth of streamer and gun arrays are beneficial for acquiring better seismic data of Mesozoic strata.

https://doi.org/10.3969/j.issn.1008-2336.2012.02.001