三湖坳陷第四系生物气异常识别技术及应用——以诺木洪北地区为例
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摘要
三湖坳陷的生物气岩性气藏勘探尚处于探索阶段。根据生物气岩性气藏的有利沉积相带,首先进行生物气岩性气藏岩石物理参数分析和含气异常正演模拟,用于指导滩坝砂含气异常的地震反射特征识别;结合构造背景,利用敏感地震属性优选可能的含气区带;最后,在异常区带内,利用频谱分解、时频分析、叠后反演及叠前烃类检测等多手段落实有利目标,形成一套适用于三湖坳陷第四系识别生物气异常的技术。
Lithologic exploration of Biogenic Gas are at the exploratory stage in Sanhu Depression. According to advantageous sedimentary belts of lithologic gas accumulation, this paper firstly analyze the parameters of rock physics, and then forward model the abnormity caused by gas to direct searching seismic abnormity. Secondly, combined with the tectonic background, select possible gas belts using sensitive seismic attributes. At last, fix the advantageous objective using many methods in the abnormal belts, such as spectrum decomposition, time-frequency analysis, prestack inversion, poststack inversion and so on. This paper build up a suite of technology to predict Quaternary biogenic gas abnormity in Sanhu Depresssion.
引文
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