鄂尔多斯盆地三叠系延长组延河剖面长7段全景地质模型的地质信息捕捉与分析

Geological Information Capture and Analysis of Virtual Reality Panoramic Geological Model of Chang 7 member of Yanchang Formation at Yanhe Section

为客观全面认识露头在区域的展布情况,实现沉浸式体验野外露头搭建信息流,将VR实景技术应用到露头沉积-地层的研究中,利用计算机技术实现露头地层展布的360°可视化,建立鄂尔多斯盆地上三叠统延长组延河剖面数字露头。基于VR全景模型开展延长组长7油层组层序地层、沉积旋回等地质信息的捕获与分析;以典型的沉积现象和程序界面识别特征为标志,在VR全景模型上,进行层序追踪,识别出一个三级层序界面即长7和长6油层组分界。通过对延河剖面长7的逐层实测,发现长7沉积代表了一个完整的层序演化过程,包括长7和长8接触界面代表的海侵体系域中的洪泛面。张家滩页岩标志着层序演化由海侵体系域演化至高水位体系域,长7和长6底部发育的水道侵蚀面代表了低水位体系域。

In order to explore the distribution of outcrops objectively and comprehensively and achieve an immersive experience of building outdoor outcrop information flow,VR panoramic technology is applied to the study of outcrop sedimentary stratum.360°visualization of stratigraphic distribution is achieved with computer technology and a digital outcrop of Yanhe Formation in the Upper Triassic of the Ordos Basin established.Geological information of sequence stratigraphy and sedimentary cycle of oil layer group of Chang 7 formation is traced on VR panoramic model and then analyzed.Taking typical sedimentary phenomena and indentifiable interface of the sequence as marks a third-order sequence boundary between Chang 7 and Chang 6 is identified.The measurement of the Chang 7 member reveals that its sedimentation represents a complete sequence evolution.Interface between Chang 7 and Chang 8 member is the flooding surface of a transgressive system tract.Zhangjiatan shale marks the sequence evolution from transgressive system tract to high water level system tract,the channel erosion surface between the bottoms of Chang 7 and Chang 6 the low water system tract.