基于地震信息的沉积体系平面分布特征研究——以鄂尔多斯盆地延长探区高家河三维区本溪组下部沉积体系为例

发布时间：2018-03-10 14:46

本文选题：本溪组　切入点：地震沉积学　出处：《天然气地球科学》2017年06期 　论文类型：期刊论文

【摘要】：阐明了利用地震信息研究沉积体系平面分布特征的方法。基于90°相位地震数据体,利用时频分析技术,分析砂层地震反射频率;结合地震滤波,压制砂层地震干涉作用。利用高精度层序地层学及地震沉积学研究技术,在地震剖面上建立高频等时地层格架。最后,将地质、测井及地震相结合,对不同主频的地层切片进行沉积学解释。结合混频显示,主成分分析(PCA)及空间雕刻技术,确定沉积体系空间分布。研究表明,研究区本溪组下部(C_2b_2)沉积时期主要发育障壁滨岸沉积体系。研究区东部可能发育一较大规模的潮道。在S229—S228区域、S207—S209区域、S224—Y287区域及Y123区域也发育树枝状潮道或潮渠,主要呈南北向、北西向展布。潮道为主要富砂区域,测井上表现为钟形或齿状钟形相,地层切片上表现为线状强能量分布模式。砂坪主要发育在S231—S208区域,沿潮道边缘分布,夹泥层,测井相类型多种多样,见漏斗状、箱状及复合漏斗状。砂坪或砂斑在地层切片上表现为斑状及蠕虫状中—强能量反射模式。该方法有助于提高预测沉积体系的精度,对研究区内的天然气勘探具有重要价值。
[Abstract]:The method of using seismic information to study the plane distribution characteristics of sedimentary system is expounded. Based on 90 掳phase seismic data volume, the seismic reflection frequency of sand layer is analyzed by time-frequency analysis technique, and combined with seismic filtering, By using high-precision sequence stratigraphy and seismic sedimentology research techniques, a high-frequency isochronous stratigraphic framework is established on the seismic profile. Finally, geological, logging and seismography are combined. Sedimentological interpretation of stratigraphic slices with different main frequencies, combined with mixing display, principal component analysis (PCAA) and spatial engraving techniques, were used to determine the spatial distribution of the sedimentary system. In the lower part of Benxi formation, the barrier shoreline sedimentary system was mainly developed in the lower part of Benxi formation. A relatively large tidal channel may be developed in the eastern part of the study area. In the S229-S228 area, S207-S209 area, S224-Y287 region and Y123 region, dendritic tidal channels or channels are also developed, mainly in a north-south direction. NW distribution. The tidal channel is the main sand rich area, the logging shows bell or toothed bell facies, and the stratigraphic slice shows a linear strong energy distribution pattern. The sand flat is mainly developed in the S231-S208 area, distributed along the edge of the tidal channel, intercalated with mud layer, the sand flat is mainly developed in the S231-S208 area. There are many types of logging facies, such as funnel, box and compound funnel. The sand flat or sand spot is characterized by porphyry and wormlike medium-strong energy reflection mode on the stratigraphic slices. This method is helpful to improve the accuracy of predicting sedimentary system. It is of great value for natural gas exploration in the study area.
【作者单位】：长安大学地球科学与资源学院;陕西延长石油(集团)有限责任公司研究院;西安石油大学地球科学与工程学院;
【基金】：国家自然科学基金项目(编号:41372118) 陕西省科技计划项目(编号:2014K10-12)联合资助
【分类号】：P618.13;P631.4

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