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首页> 外文期刊>Journal of natural gas science and engineering >Differences in shale gas exploration prospects of the upper Yangtze Platform and the lower Yangtze Platform: Insights from computer modelling of tectonic development
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Differences in shale gas exploration prospects of the upper Yangtze Platform and the lower Yangtze Platform: Insights from computer modelling of tectonic development

机译：上扬子平台和下扬子平台页岩气勘探前景的差异：构造发育计算机模型的启示

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The Yangtze Platform has been relatively stable throughout its geologic history and is considered to be one of the most promising regions in China for shale gas extraction. Because the Yangtze Platform covers a large area, the tectonic features of the upper Yangtze Platform (UYP) in the west differ strongly from those of the lower Yangtze Platform (LYP) in the east. These differences may affect the formation and preservation of shale gas. Comparative analysis of the Palaeozoic sedimentary-tectonic evolutions of the UYP and LYP indicates that their development was similar during the Palaeozoic. Combining the results of the above mentioned analysis with recently determined reservoir properties of shale from the Yangtze Platform, it is believed that the conditions for shale gas formation were good in both the UYP and LYP. We compared post-Mesozoic tectonic activity in the UYP and LYP to gain a greater understanding of shale gas preservation potential in both areas. The results of our analysis indicated large differences between the two regions. The UYP has been under a compressive stress regime since the Mesozoic, although the compressive stresses have weakened since the Yanshan movement. On the other hand, the LYP has been in compression since the Indosinian, and tectonic inversion occurred after the middle Yanshanian, thus, the area is in a weak extensional environment. These different stress environments are believed to affect shale gas reservoirs in the two regions differently. Therefore, a series of computer-based simulations were conducted according to the geological conditions of the Yangtze Platform, and these simulations show an enhanced sealing ability under the compression experienced by the UYP compared with the extensional tectonic regime experienced by the LYP. In addition, the tectonic inversion of the LYP may cause shale gas reservoirs to have a degraded sealing ability. Our results suggest that the resource potential of shale gas in the UYP is likely greater than that in the LYP. (C) 2016 Elsevier B.V. All rights reserved.
机译：长江平台在整个地质历史中一直相对稳定，被认为是中国页岩气开采最有前途的地区之一。由于扬子台地面积大，西部的扬子台地上部构造特征与东部的扬子台地构造特征明显不同。这些差异可能会影响页岩气的形成和保存。对UYP和LYP的古生代沉积-构造演化的比较分析表明，它们在古生代期间的发育是相似的。结合上述分析结果和最近确定的来自扬子平台的页岩储层性质，认为在UYP和LYP中页岩气形成的条件都很好。我们比较了UYP和LYP中的中生代构造活动，以更好地了解这两个地区的页岩气保存潜力。我们的分析结果表明两个区域之间存在很大差异。自中生代以来，UYP一直处于压应力状态，尽管自燕山运动以来压应力已减弱。另一方面，自印支期以来，LYP一直处于受压状态，在燕山期中期以后发生了构造反转，因此该地区处于弱伸展环境。据信这些不同的应力环境对这两个地区的页岩气储层有不同的影响。因此，根据扬子平台的地质条件进行了一系列基于计算机的模拟，这些模拟显示，与LYP经历的伸展构造条件相比，UYP经历的压缩作用下具有更高的封闭能力。另外，LYP的构造反转可能使页岩气储层的密封能力下降。我们的结果表明，UYP中的页岩气资源潜力可能大于LYP中的页岩气资源潜力。 （C）2016 Elsevier B.V.保留所有权利。

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