摘要
目前主要利用叠后地震资料的振幅和频率信息进行油气检测。甜点属性预测是其中常用的一种方法,但受储层厚度、相邻层干涉等多种非流体因素影响,检测结果存在多解性。为此研究了基于90°相移的振幅属性和频率属性进行油气检测的原理,提出了融合90°相移的振幅和瞬时频率属性进行流体检测的方法。该方法基于原始零相位地震资料提取90°相移的振幅和频率属性,再利用已钻井油气水层的地震属性约束最优化求解融合参数,最后将基于90°相移的振幅和频率属性融合从而获得油气检测结果。模型正演结果表明,相较于常规甜点预测方法,该方法在主力储层厚度范围内(8～25m)受储层厚度影响小,能有效压制相邻层干涉,更适合流体检测。渤海PL油田的实际应用结果表明该方法能够有效区分油层与水层,且烃检异常空间分布符合油气成藏规律。
At present,seismic amplitude and frequency attributes,such as the sweetness attribute,are usually used for hydrocarbon detection by most post-stack methods.However,the hydrocarbon detection results based on the common sweetness attribute,are highly ambiguous due to the influences of thickness,interference of adjacent strata,and other non-fluid factors.In this paper,a new method for hydrocarbon detection is proposed that involves fusing a 90°phase shift attribute and its instantaneous frequency attribute.Firstly,the 90°phase shift and instantaneous frequency attributes were extracted based on original zero-phase seismic data.Then,the seismic attributes of hydrocarbon and water reservoirs in drilled wells were used as constraints to optimally solve the fusion parameters.Finally,the amplitude and frequency attributes were fused to obtain the hydrocarbon detection results.Forward modeling results showed that the new method was less affected by the thickness of the reservoir within the range 8~25 m,than the conventional sweetness attribute.The proposed method suppressed the interference of adjacent reservoirs effectively,and was therefore more applicable for fluid detection.The practical application in the Bohai PL oilfield demonstrated that the proposed method successfully distinguished between oil layers and water layers.Furthermore,the spatial distribution of oil-bearing anomalies was in accordance with the law of hydrocarbon accumulation.
作者
郑江峰
彭刚
孙佳林
甄宗玉
ZHENG Jiangfeng;PENG Gang;SUN Jialin;ZHEN Zongyu(Tianjin Branch,Bohai Oilfield Institute of CNOOC Ltd,Tianjin 300459,China)
出处
《石油物探》
EI
CSCD
北大核心
2019年第1期130-138,共9页
Geophysical Prospecting For Petroleum
基金
国家科技重大专项(2016ZX05024)资助~~
关键词
地震振幅
甜点
油气检测
90°相移
瞬时频率
储层厚度
储层干涉
seismic amplitude
sweetness
hydrocarbon detection
90°phase shift
instantaneous frequency
reservoir thickness
reservoir interference
