沁水盆地南部地区石炭—二叠系古构造恢复及对煤层气的控制作用

根据沁水盆地南部地区的127口煤层气井的测井、录井及产能数据资料,完成了对沁水盆地南部地区石炭系-二叠系古构造的恢复及控气作用的研究。研究选取了声波时差法和镜质体反射率法恢复了沁南研究区二叠系顶面剥蚀量,其结果表明燕山早期、燕山晚期及喜山中期地层剥蚀量整体北部大,南部小;且剥蚀量具有逐渐向四周扩散的趋势。恢复了太原组及山西组顶面在燕山早期、燕山晚期及喜山中期的古构造,三个时期的太原组及山西组顶面古构造特征较为类似,整体呈现南低北高特征。在此基础上,将研究区划分为坳陷区、斜坡区和隆起区。从古构造角度来看,研究区相对隆起区和斜坡区是天然气聚集成藏的有利区,而深坳区则不利于煤层气的聚集。

Paleostructural restoration and its controlling effect to coal-bed methane of the Carboniferous - Permian strata in Southern Qinshui Basin

According to 127 CBM Wells logging, and production data in the southern Qinshui Basin, completed the Carboniferous - Permian paleostructural restoration and the study of effects of gas controlling in southern Qinshui Basin. This study selected the acoustic time difference method and vitrinite reflectance method to restore the ooze south denudation amount at the top of the Permian strata in the study area, the result shows that the denudation amounts in early Yanshanian, late Yanshanian and Himalayan all whole north big, and small in the south. The denudation amounts have the trend of spreading. The paleostructure of Taiyuan and Shanxi group in middle Yanshanian, late yanshanian and Himalayan are restorated, three periods of taiyuan and shanxi group top ancient tectonic characteristics are similar, present the characteristics of lower in the south and higher in the north. On this basis, the study area is divided into depression zone, slope zone and uplift area. From the angle of palaeostructure, relative uplift zone and slope zone in the study area are favorable for natural gas accumulation zone, while the deep depression area is not conductive to coalbed methaneaccumulation.