琼东南勘查区天然气水合物地震属性分析研究
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摘要
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 decomposition, 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 response by all kinds of methods,the favorable areas have been delineated,improving the prediction accuracy of gas hydrate in Qiongdongnan Basin.
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 decomposition, 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 response by all kinds of methods,the favorable areas have been delineated,improving the prediction accuracy of gas hydrate in Qiongdongnan Basin.
引文
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[2]刘彦君,刘喜武,刘大锰,等.地球物理技术在天然气水合物分布区预测中的应用[J].石油勘探与开发,2007, 34(5):566-573.
[3]梁劲,王宏斌,梁金强.Jason反演技术在天然气水合物速度分析中的应用[J].南海地质研究,2006,总第18期:114-120.
[4]李灿苹,李敏锋.天然气水合物储层地震波振幅属性研究[J].广东海洋大学学报,2011,31(3):63-69.
[5]孙春岩,黄新武,章明昱,等.天然气水合物及其地球物理识别方法的研究进展[J].现代地质,2003,17(2):195-201
[6]吕琳,王明君,范继璋.地震属性在天然气水合物识别中的应用[J].地球物理学进展,201 1,26(2):596-601.
[7]赵政璋,赵贤正,王英民.储层地震预测理论与实践[M].北京:科学出版社,2005.
[8]宋海斌,松林修,杨胜雄,等.海洋天然气水合物的地球物理研究(Ⅱ):地震方法[J].地球物理学进展,2001, 16(3):110-118.
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