Comparison of sandbody,top of Carboniferous Karashayi Formation,district 6-7,Tahe Oil Field
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摘要: 塔河油田6-7区石炭系高产井出油砂体主要位于卡拉沙依组顶部,砂体规模小,厚度薄。在地震分辨率难以识别薄砂体的情况下,利用卡拉沙依组地层厚度变化推断砂体尖灭线位置。在地层厚度变化较大的地方,容易形成有利的岩性圈闭。利用子波分解去T05强轴技术,去除大套地层的强反射,突出薄砂体的弱反射信息,识别薄层砂体平面上的分布范围。Abstract: In district 6-7 of the Tahe Oil Field, oil sands in high-yielding wells mainly locate at the top of Carboniferous Karashayi Formation. The sandbodies have small scale and thin thickness. When seismic resolution fails to identify thin sandbody, we can use the formation thickness changes of Karashayi Formation to predict the location of sandbody pinch-out boundary. Favorable lithologic traps may generate at where formation thickness changes obviously. We use wavelet decomposition to remove T50 strong reflection. The strong reflection of big formation is removed, and the weak reflection of thin sandbody is strengthened, which may help to identify the plane distribution range of thin sandbody.
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