| 层序格架约束下的地质统计学反演在薄砂体预测中的应用 |
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| 引用本文： | 刘晓晨,陆永潮,杜学斌,李祥权,林卫兵,张靖宇,冯琳.层序格架约束下的地质统计学反演在薄砂体预测中的应用[J].地质科技通报,2020,39(3):99-109. |
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| 作者姓名： | 刘晓晨 陆永潮 杜学斌 李祥权 林卫兵 张靖宇 冯琳 |
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| 作者单位： | 中国地质调查局油气资源调查中心;中国地质大学（武汉） |
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| 基金项目： | 国家科技重大专项2016ZX05027-001-005 |
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| 摘 要： | 西湖凹陷砂岩储层具有砂体厚度薄、砂泥互层发育以及横向变化快的特点,传统的地球物理方法很难精细地刻画砂体空间分布。将层序地层学与地质统计学反演相结合,在建立等时地层格架的基础上,构建相应的地球物理模型,在正确的沉积学理论指导下,对西湖凹陷平湖斜坡带平湖组砂岩储层开展砂体的时空分布预测研究。研究结果表明,平湖组可划分出3个三级层序,下部砂体单层厚度较大,横向连续性好,平面连片发育;中部以泥岩为主,砂体孤立发育,连续性差;上部砂体增多,单层厚度较薄,横向连续性好。结合钻井实际资料分析表明,砂体预测结果垂向分辨率可以达到1~2 m。地质统计学反演有效解决了西湖凹陷平湖斜坡带薄层砂体识别的难题,可为研究区有利储层预测提供重要支撑。
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| 关 键 词： | 层序地层学 地质统计学反演 储层预测 西湖凹陷 |
| 收稿时间： | 2019-11-10 |
Application of geostatistical inversion constrained by sequence framework in thin-bedded sandbody prediction |
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| Liu Xiaochen,Lu Yongchao,Du Xuebin,Li Xiangquan,Lin Weibing,Zhang Jingyu,Feng Lin.Application of geostatistical inversion constrained by sequence framework in thin-bedded sandbody prediction[J].Bulletin of Geological Science and Technology,2020,39(3):99-109. |
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| Authors: | Liu Xiaochen Lu Yongchao Du Xuebin Li Xiangquan Lin Weibing Zhang Jingyu Feng Lin |
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| Institution: | (Oil and Gas Resources Survey,China Geological Survey,Beijing 100083,China;China University of Geosciences(Wuhan),Wuhan 430074,China) |
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| Abstract: | The spatial distribution of the sand reservoir in Xihu Depression is difficult to predict precisely by using traditional geophysical techniques, owing to the following two main reasons:1)The single-layer thickness of the sand reservoir is thin; and 2)Interbeds of sandstone and mudstone show rapid and frequent lateral lithofaices change.Based on geological data and geophysical techniques, the isochronous sequence stratigraphic framework of the Eocene Pinghu Formation in Pinghu slope belt of Xihu Depression was established.The sandbody distribution within the sequence stratigraphic framework was predicted by using geostatistical inversion.The result shows that Pinghu Formation can be divided into three 3rd-order sequences.The lower sandbody is characterized by large single layer thickness, good lateral continuity, and contiguous plane development.The middle part is composed mainly of mudstone, with the isolated sandbody and poor continuity.The upper part exhibits an increase trend in layer thickness in sandbody with fine lateral continuity.Comparison of the geophysical research with traditional geological research reveals that the vertical resolution of sandbody prediction results obtained by geostatistical inversion could reach a resolution down to 1-2 m.The results indicate that geostatistical inversion is an effective approach to solve the problem on precise lithofacies identification and spatial distribution prediction by using 3D seismic data in Xihu Depression, providing valuable guidance for the favorable reservoir prediction in the future. |
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| Keywords: | sequence stratigraphy geostatistical inversion reservoir prediction Xihu Depression |
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