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中及上奥陶统是塔里木盆地中部地区主要的油气勘探目的层。在综合地层划分对比的基础上 ,分析了塔中地区中及上奥陶统不同沉积相的分布规律。礁滩沉积和斜坡沉积构成了台地边缘相的主体。碳酸盐台地上不同期次发育的边缘相是重要的油气储集体 ,它们主要分布于塔中I号断裂构造带、TZ10井构造带和塔中南缘断裂构造带上 ,沉积厚度相对较大。可以得出这样的结论 :这种分布状况代表了塔中地区构造对沉积相带的控制作用。通过大量二维及三维地震资料解释分析发现 ,在塔中广泛分布的丘状隆起地震相、楔状前积反射地震相和杂乱反射地震相多沿主要构造线延伸 ,内部反射杂乱 ,呈乱岗状反射。将已经认识的沉积相类型和这些地震相的分布特征相比较 ,可以确定这种地震相就是碳酸盐台地边缘相沉积体。这样 ,就有可能利用丰富的地震资料 ,预测有利于油气富集的储集体的展布规律。
Middle and Upper Ordovician is the main oil and gas exploration target in central Tarim Basin. On the basis of comprehensive stratigraphic division and contrast, the distribution of different sedimentary facies in middle and upper Ordovician in Tazhong area is analyzed. Reef beach deposits and slope sediments constitute the main body of the platform margin phase. The marginal facies developed at different stages of the carbonate platform are important oil and gas reservoirs. They are mainly distributed in Tazhong I fault zone, TZ10 well zone and central and southern margin of the tower, with relatively large sedimentary thickness. It can be concluded that this distribution represents the control of sedimentary facies in the Tazhong area. Through a large number of 2D and 3D seismic data interpretation and analysis, it is found that the mound-shaped uplift seismic facies, the wedge-shaped pre-seismic reflection facies and the reverberant seismic facies extend extensively along the main tectonic line in the tower. The internal reflection is disorderly and disorderly reflection. Comparing the known types of sedimentary facies with the distribution of these seismic facies, it can be determined that this seismic facies is the sedimentary body of the carbonate platform margin. In this way, it is possible to use rich seismic data to predict the distribution of reservoirs that favor hydrocarbon enrichment.