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鄂尔多斯盆地大牛地气田二叠系下石盒子组盒3段属于典型的河流相沉积,由于地震属性预测受地震分辨率限制,造成河道砂体储层预测的多解性。应用高分辨率层序地层学,对盒3段目的层进行了沉积相展布规律研究,认清了盒3段顶界面地震反射层Tf9是一个在全区有近似等时地质意义的反射界面,盒3段上砂组的厚度与Tf9平均振幅的统计关系符合调谐振幅原理,从而优选出盒3段砂岩的振幅敏感属性。通过地震相、测井相及沉积微相综合分析,认为盒3段振幅敏感属性平面图与其沉积相展布规律一致,通过相关分析能较好地预测出砂岩发育的有利区。在D66井附近目标区的实践表明,砂岩预测结果与实钻吻合率达90%。由此表明,以沉积相、沉积特征约束地震属性预测能实现对复杂地质体的准确预测和描述。
The Member 3 of the Permian Lower Shihezi Formation in the Daniudi Gas Field, Ordos Basin, belongs to the typical fluvial facies sedimentation. Since the seismic attribute prediction is limited by the seismic resolution, the multi-solution of the reservoir prediction in the channel sand body is caused. Using the high-resolution sequence stratigraphy, the sedimentary facies distribution of the three layers of the box was studied. It is clear that the seismic reflection layer Tf9 at the top of the box 3 is a reflection interface with similar isochronology in the whole area The statistical relationship between the thickness of the sand group and the average amplitude of Tf9 in the three sections of the box conforms to the principle of tuning amplitude, so that the amplitude-sensitive properties of the sandstone in the box 3 are optimized. According to the comprehensive analysis of seismic facies, log facies and sedimentary microfacies, it is considered that the amplitude sensitive attribute plan of Box 3 is consistent with the distribution of sedimentary facies, and the favorable analysis of sandstone development can be predicted well by correlation analysis. The practice in the target area near Well D66 shows that the sandstone prediction is 90% consistent with real drilling. The results show that the prediction of seismic attributes with sedimentary facies and sedimentary features can accurately predict and describe complex geological bodies.