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Paleo-karst zone and its control on reservoirs in the fourth member of the Sinian Dengying formation in the Moxi area, central Sichuan Basin
Carbonates and Evaporites ( IF 1.4 ) Pub Date : 2022-06-24 , DOI: 10.1007/s13146-022-00788-z
Qinyu Xia , Haijun Yan , Wei Xu , Lin Zhang , Qian Li , Wenjun Luo , Hui Deng , Xun Zhu , Xinyu Li , Jichen Yu

Paleo-karst controls reservoirs in the fourth member of the Sinian Dengying formation in the Sichuan Basin. It is crucial to characterize the paleo-karst zone architecture to understand better the distribution of reservoirs controlled by the multi-stage ancient water tables. We divide vertical paleo-karst zones using cores and formation micro-scanner images based on the groundwater movement and development of pores and fractures. Then we analyze positions and variations of paleo-karst water tables according to the characteristics of different paleo-karst zones. Besides, we illustrate the distribution of underflow subzones and the development of reservoirs in each subzone. This paper reveals the relationship between paleo-karst landform relative elevation, paleo-karst zone thickness and reservoir thickness. Thus, we build the paleo-karst evolutionary pattern in the study area. Research suggests that vadose, underflow, and slow flow zones develop in the intended interval. We identify four underflow subzones in response to four paleo-karst water tables. Compared with the vadose zone, the underflow zone is thicker and holds more reservoirs, mainly distributed in the upper part of the single underflow subzone. Higher paleo-karst landform can possess a thicker vadose zone and thinner underflow zone. Besides, an excellent positive linear correlation exists between reservoir thickness and paleo-karst zone thickness. The thickness of the subzone constrains the development of reservoirs in it. The second and third underflow subzones are the most favorable intervals, owning more reservoirs.



中文翻译:

川中磨溪地区震旦系灯影组四段古岩溶带及其对储层的控制

四川盆地震旦系灯影组四段古岩溶控制储层。刻画古岩溶带结构特征对于更好地了解多期古地下水位控制的储层分布至关重要。我们利用岩心和地层微扫描图像根据地下水运动和孔隙裂缝的发育划分垂直古岩溶带。然后根据不同古岩溶带的特征,分析古岩溶地下水位的位置和变化。此外,我们还说明了潜流子带的分布和每个子带储层的发育情况。揭示了古岩溶地貌相对高程、古岩溶带厚度与储层厚度之间的关系。因此,我们构建了研究区的古喀斯特演化格局。研究表明,在预期的间隔内会形成渗流、下溢和慢流区。我们根据四个古岩溶地下水位确定了四个潜流子带。与包气带相比,底流带较厚,储集层较多,主要分布在单一底流子带的上部。较高的古岩溶地貌可具有较厚的渗流带和较薄的潜流带。此外,储层厚度与古岩溶带厚度之间存在良好的正线性相关性。分区的厚度限制了其中储层的发育。第二和第三底流子带是最有利的层段,拥有更多的储层。和慢流区在预期的间隔内发展。我们根据四个古岩溶地下水位确定了四个潜流子带。与包气带相比,底流带较厚,储集层较多,主要分布在单一底流子带的上部。较高的古岩溶地貌可具有较厚的渗流带和较薄的潜流带。此外,储层厚度与古岩溶带厚度之间存在良好的正线性相关性。分区的厚度限制了其中储层的发育。第二和第三底流子带是最有利的层段,拥有更多的储层。和慢流区在预期的间隔内发展。我们根据四个古岩溶地下水位确定了四个潜流子带。与包气带相比,底流带较厚,储集层较多,主要分布在单一底流子带的上部。较高的古岩溶地貌可具有较厚的渗流带和较薄的潜流带。此外,储层厚度与古岩溶带厚度之间存在良好的正线性相关性。分区的厚度限制了其中储层的发育。第二和第三底流子带是最有利的层段,拥有更多的储层。潜流带较厚,储集层较多,主要分布在单一潜流亚带的上部。较高的古岩溶地貌可具有较厚的渗流带和较薄的潜流带。此外,储层厚度与古岩溶带厚度之间存在良好的正线性相关性。分区的厚度限制了其中储层的发育。第二和第三底流子带是最有利的层段,拥有更多的储层。潜流带较厚,储集层较多,主要分布在单一潜流亚带的上部。较高的古岩溶地貌可具有较厚的渗流带和较薄的潜流带。此外,储层厚度与古岩溶带厚度之间存在良好的正线性相关性。分区的厚度限制了其中储层的发育。第二和第三底流子带是最有利的层段,拥有更多的储层。分区的厚度限制了其中储层的发育。第二和第三底流子带是最有利的层段,拥有更多的储层。分区的厚度限制了其中储层的发育。第二和第三底流子带是最有利的层段,拥有更多的储层。

更新日期:2022-06-27
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