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基于高阶统计量的地震子波提取方法评价 被引量:8
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作者 陈健 戴永寿 +2 位作者 张亚南 魏玉琴 丁进杰 《石油地球物理勘探》 EI CSCD 北大核心 2013年第3期497-503,506+332,共7页
基于高阶统计量的子波提取方法可提取一个非最小相位的地震子波,但需要对地震资料和地下反射系数序列分布进行一定假设,且子波提取方法是一个开环过程,在实际应用中还存在提取子波的稳定性、唯一性、精度、抗噪能力、收敛性及带限数据... 基于高阶统计量的子波提取方法可提取一个非最小相位的地震子波,但需要对地震资料和地下反射系数序列分布进行一定假设,且子波提取方法是一个开环过程,在实际应用中还存在提取子波的稳定性、唯一性、精度、抗噪能力、收敛性及带限数据长度适应性等问题,因此该法的有效性及提取子波的准确性仍有待验证。本文对主要的几种子波提取方法进行了综述,其中包括:基于测井资料进行井旁子波提取评价、利用地震反演进行子波提取评价、基于合成地震记录与实际地震记录比较的子波提取评价、基于子波本身属性的子波提取评价。文中对各方法的优势和不足进行了全面分析,认为基于地震记录属性参数和子波属性的动态评价方法能够更有效地评价子波提取方法的有效性和提取子波的精度,通过分析提取子波的属性参数和相应的地震记录的属性参数之间的关系及其对基于高阶统计量的子波提取方法的影响程度,可为子波提取方法的修正和完善提供借鉴。 展开更多
关键词 高阶统计量 地震子波提取 评价 地震反演 地震记录属性 子波属性
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Fluvial reservoir characterization and identification:A case study from Laohekou Oilfield 被引量:4
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作者 张军华 刘振 +3 位作者 朱博华 冯德永 张明振 张学芳 《Applied Geophysics》 SCIE CSCD 2011年第3期181-188,239,240,共10页
Finding channel sandbodies is an important task in oil and gas exploration due to the importance of fluvial reservoirs. It is difficult to describe fluvial reservoirs in detail owing to their frequent changes and seri... Finding channel sandbodies is an important task in oil and gas exploration due to the importance of fluvial reservoirs. It is difficult to describe fluvial reservoirs in detail owing to their frequent changes and serious intersections, as well as limitations of S/N ratio and seismic data resolution. Based on the Laohekou 3D data in Shengli Oilfield, we analyze the general characteristics of fluvial reservoirs in this area, from which we find that they are characterized by strong amplitudes on seismic profiles, high continuity on time slices, and low frequency in the frequency domain. In addition, a cluster of strong string-bead- like reflections was found after color processing and detailed interpretation. To understand this observation, we conduct forward modeling to explain the mechanism. This provides a new way to identify ancient channels in similar areas. By using the multi-attribute fusion and RGB display techniques, channel incision is more obvious and the characteristics of the channel structures are manifested much better. Finally, we introduce and apply multi-wavelet detection technology to identify weaker fluvial reservoir signals. 展开更多
关键词 channel sandbody weak signal string-bead-like reflections attribute fusion multi- wavelet interpretation technology
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Periodic Precipitation of Liesegang System under Microwave Radiation
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作者 Yushin Kanazawa Yusuke Asakuma 《Journal of Chemistry and Chemical Engineering》 2014年第4期331-334,共4页
We studied precipitation patterns in a Liesegang system under MW (microwave) irradiation in order to investigate metal salt diffusion in an electrolyte gel. The gel and salt concentrations were varied. MW irradiatio... We studied precipitation patterns in a Liesegang system under MW (microwave) irradiation in order to investigate metal salt diffusion in an electrolyte gel. The gel and salt concentrations were varied. MW irradiation induced periodic patterns of precipitation because polar molecules vibrate and rotate in an electromagnetic field. For example, the number of patterns increased by the irradiation. Accordingly, microwave irradiation nonlinearly accelerated the diffusion of ionic molecules. 展开更多
关键词 MW Liesegang DIFFUSION precipitation.
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