济阳坳陷古近系页岩气开发前景分析

Development prospect of Paleogene shale gas in Jiyang depression

济阳坳陷是一个在华北地台上发育起来的中生代-新生代断陷-坳陷盆地。该盆地内古近系沙一段、沙三下亚段和沙四上亚段泥页岩分布面积广,有机质丰度高,具备形成大量页岩油气的物质基础;泥页岩中黏土矿物含量低,以钙质为主的脆性矿物含量高,有利于页岩油气的开采。但盆地内断裂活动极其活跃,断层纵横,将盆地分割成大小不一的多个复杂断块,破坏了页岩的连续性,限制了页岩气藏的边界,因而制约了单个断块的储量,不利于规模开采。

Jiyang depression is a Mesozoic-Cenozoic rift-depression basin that developed on North China platform.The mudstone and shale of Paleogene Es1,lower Es3 and upper Es4 widely distribute in the basin,which have high abundance of organic matter and the material basis for forming a large number of shale oil and gas;clay mineral content in mudstone and shale is low,the content of calcium-based brittle minerals is high,which is conducive to the development of shale oil and gas.But the fault activities within the basin is extremely active,the faults distribute vertically and horizontally,the basin was divided into different sizes of the complex fault blocks,which destroyed the shale continuity,limited the shale gas reservoir boundaries,restricted the reserves of the single block and was not conducive to exploration.