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系统地讨论了本文所获q_0=596/V~2Pn-7.8统计关系式存在的正确性。指出地壳和上地幔弹性波速的横向变化,与介质温度状态的横向差异存在密切关系。本文统计获得壳—幔界面侧面波Pn速度,在不同性质大地构造单元的分布特征为:地槽区7.3—8.0,地台区>8.2,地洼区7.3—8.1(公里/秒),可作为现阶段区域大地构造性质的判别标志之一。 中国西部地洼区地壳普遍存在一低速层,而在东部地洼区地壳中,低速层不明显或不存在,这种差异可能是区分地洼区激烈期和余动期的一种标志。 由于温度状态对油气形成的影响,相关于深部温度状态的地壳和上地幔速度结构,将可能对大油气区的分布,提供一个有益的背景参数。据初步资料分析.大油气区基本上分布于Vpn7.9—8.2公里/秒的沉积盆地,中国广大地洼区Vpn均接近8.0,这类沉积盆地最可能成为大油气产出的远景区。所以,地洼型油气田的开发在中国具有重要的经济意义。
The correctness of the statistical relationship of q_0 = 596 / V ~ 2Pn-7.8 obtained in this paper is systematically discussed. The lateral variations of the elastic wave velocity in the crust and the upper mantle are pointed out, which are closely related to the lateral differences of the medium temperature states. In this paper, the lateral Pn velocities of the crust-mantle interface are obtained. The tectonic units in different types of tectonic features are distributed in the terrain area of 7.3-8.0, the terrace area of 8.2 and the ground depression of 7.3-8.1 km / s, One of the distinguishing marks of tectonic properties of the region at this stage. There is a low-velocity layer in the crust of the western depression depression, while the low-velocity layer in the crust of the eastern depression is not obvious or non-existent. This difference may be a sign of the distinction between the intense and the rest periods of the Diwak region. Due to the influence of temperature on formation of oil and gas, the velocity structure of the crust and upper mantle associated with deep temperature will probably provide a useful background parameter for the distribution of large oil and gas fields. According to the preliminary data analysis, the large oil and gas zones are basically distributed in sedimentary basins of Vpn 7.9-8.2 km / s. The Vpn of the vast depressions in China are both close to 8.0. Such sedimentary basins are most likely to become the major oil and gas producing prospect. Therefore, the development of Diwa oil and gas fields in China has important economic significance.