琼东南勘查区天然气水合物地震属性分析研究

Seismic Attribute Analysis of Gas Hydrate in Qiongdongnan Basin

蒋涔 张大海 周英 尹春蕾 刘苗 杨丽娜

JIANG Cen ZHANG Dahai ZHOU Ying YIN Chunlei LIU Miao Yang Lina

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

Institute of SINOPEC Shanghai Offshore Petroleum Company, Shanghai 200120, China

天然气水合物是一种由气体和水分子组成的笼形包合物,形成于低温、高压条件下,对环境有重要影响。海洋温压条件的变化均可使水合物失稳分解,导致海底滑坡,甚至引发一些重大地质事件。针对南海琼东南勘查区的地震数据进行气水合物属性分析,在总结前人研究成果的基础上,形成了针对本工区气水合物检测的地震属性分析、精细速度分析、纵波阻抗反演研究、极性分析等技术手段及方法,并综合评价各种方法所能反应的地质特征,圈定有利区,提高了琼东南地区天然气水合物的预测精度。

Gas hydrate is a kind of cage clathrate of gas and water, formed under the low temperature and high pressure conditions. Hydrates have a major impact on the environment. The changes of ocean temperature and pressure conditions may cause hydrate de-composition, resulting in submarine landslides, even causing some great geological events. Through analysis of the seismic attributes of gas hydrates in Qiongdongnan area, combined with the previous study results, a series of techniques and methods for the detection of the gas hydrates of the study area have been developed, including seismic attribute analyzing technique, fine velocity analyzing technique, P-impedance inversion and polarity analyzing technique. Through comprehensive evaluation on the geological feature re-sponse by all kinds of methods, the favorable areas have been delineated, improving the prediction accuracy of gas hydrate in Qiong-dongnan Basin.

https://doi.org/10.3969/j.issn.1008-2336.2013.01.018