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本文分析了美国HartzogDraw气田 41 0 6井、Katie 1井和 2 0 1 1井等 3口井上白垩统Shannon储层AVO属性参数 ,Shannon层段在 41 0 6井处为 2 1m厚的含气砂岩 ;在Katie 1井处为 6 5m厚非储层 (干层 ) ;在 2 0 1 1井处为 8 5m厚含水砂岩。通过分析 3口井资料作出Shannon层段顶面反射系数与入射角之间的关系图和有关AVO属性参数的交会图 ,研究了不同岩性、不同流体性质的Shannon层段的AVO异常地质属性特征 ,得出结论 :不同的AVO异常代表了不同的地质属性特征 ,含气砂岩具有较明显的AVO异常 ,由于其泊松比明显下降 ,AVO斜率一般为负值 ;含水砂岩由于其泊松比增加 ,AVO斜率一般为正值。非储层 (干层 )砂岩其泊松比与围岩相近 ,AVO异常不明显。由此认为AVO的有关属性参数的研究可以为含气砂岩的定量化描述提供准确依据。最后建议 :①为防止结论的片面性 ,在进行AVO异常地质分析时 ,要利用最多的测井资料进行正演模拟分析 ;②为了更好地开展AVO的反演研究 ,有必要分别建立含气层、含水层和干层的AVO模型。
In this paper, the AVO properties parameters of three Upper Cretaceous Shannon reservoirs in Well Hartzog Draw Oilfield, such as Well 4106, Katie 1 and Well 2011, are analyzed. The Shannon section is a 21m-thick gas-bearing sandstone ; A non-reservoir (dry layer) of 65 m in thickness at Katie 1; an 85 m thick sandstone at 2017. By analyzing the data of three wells to make the Shannon interval top reflection coefficient and the angle of incidence and the cross plot of the AVO attribute parameters, the AVO anomalous geologic attribute features of Shannon intervals with different lithology and fluid properties , It is concluded that different AVO anomalies represent different geological attributes and that the gas-bearing sandstones have obvious AVO anomalies. The AVO slope is generally negative due to the obvious decrease of Poisson’s ratio. Because of the increase of Poisson’s ratio , AVO slope is generally positive. The non-reservoir (dry layer) sandstone has similar Poisson’s ratio with the surrounding rock, and the AVO anomaly is not obvious. Therefore, it is considered that the study of AVO related attribute parameters can provide an accurate basis for the quantitative description of gas-bearing sandstone. Finally, we suggest: ①To avoid the one-sidedness of the conclusion, it is necessary to use the most well logging data to conduct forward modeling analysis when conducting anomaly geological analysis of AVO. ②In order to carry out inversion research of AVO well, it is necessary to establish gas-bearing layer , Aquifer and dry AVO model.