观测系统面元细分问题分析

Problem analysis of bin-divisible geometry

(1.中国石油化工股份有限公司油田勘探开发事业部,北京100728；2.大庆石油学院地球科学学院，黑龙江大庆163318；3.同济大学海洋与地球科学学院，上海200092)

Oilfield Exploration and Development Department,SINOPEC,Beijing 100728,China

建立了均匀性判别法则,利用总道数和炮检距统计数据,说明了细分面元比固定面元有更好的均匀性。针对当前对面元细分方法的不同认识,提出了最小面元是实面元而其它大面元均是虚面元的观点,最小面元和覆盖次数有一定的匹配关系。最小面元应该有足够的但又不能过高的覆盖次数,覆盖次数与信噪比存在一定的函数关系;最小面元越小,分辨率越高,实际资料解释中应该采用最小面元。以面元细分观测系统在MC,YX和SH地区的应用为例,对于不同复杂地质情况及信噪比,分析了面元和覆盖次数的细分程度和效果,指出了前两个观测系统存在过于追求小面元而导致覆盖次数偏低的问题,实际资料解释无法采用最小面元而采用大面元资料,降低了分辨率;而SH地区观测系统的最小面元和覆盖次数搭配合理,覆盖次数在合适范围内,实际资料解释时使用了最小面元,应用效果较理想。

We established a uniform identification rule.By using statistical data of the total channel number and the offset,it is showed that the uniformity of bin-divisible geometry is better than that of fixed bin geometry.Based on the different understanding of bin-divisible methods,we pointed out that the minimum sub-bin is the real one while the other bigger bins are virtual.The minimum bin and fold has some matching relationship.The minimum bin should have enough but not extremely high fold,and some function relationship exists in the fold and signal-to-noise ratio.Smaller minimum bin leads to higher resolution.In actual data interpretation,minimum bin should be adopted.Taking the application of bin-divisible geometry in MC,YX and SH area as example,in different geological and signal-to-noise conditions,the bin-divisible effect was analyzed.The data acquisition of the former two areas pursued extremely small bin size,which leads to the relatively low fold.Actual data interpretation cannot use the data with minimum bin,which causes lower resolution.On the contrary,the minimum bin size and fold match well in SH area,and fold is reasonable.So the actual data interpretation in SH area used the minimum bin,and ideal results were obtained.niform identification rule;minimum bin;real bin;virtual bin;matching of bin and fold