涪陵页岩气田焦石坝页岩气储层含气量测井评价

Log Evaluation of Gas Content from Jiaoshiba Shale Gas Reservoir in Fuling Gas Field

为深化焦石坝区块页岩气储层评价认识,以四川盆地首口参数井页岩岩心实验为基础,建立了基于常规测井资料的页岩气储层游离气、吸附气及总含气量计算模型与评价标准,并应用于工区内3口探井连续含气量剖面建立和综合评价。焦石坝页岩气田龙马溪组下部—五峰组页岩气以游离气为主,吸附气为辅,游离气含量达到了吸附气含量的2倍以上。其页岩气层含气量呈"上低下高"且随深度增加而增大特征,其中下段总含气量大,游离气含量高,为最优"甜点"段,是典型的Ⅰ类气层,具有非常好的商业开发价值。

In order to make better understanding about the shale gas reservoir in Jiaoshiba block of Fuling shale gas field, based on the core experiment of the first parameter well in Sichuan basin, we establish the calculation models and evaluation standards of free gas, adsorbed gas and total gas content of shale gas reservoirs with conventional log data. And which is applied in setting up and evaluation the continuous gas content profile for 3 exploratory wells in the studied area. The shale gas of lower Longmaxi group--Wufeng group is main free gas and subsidiary adsorption gas in Jiaoshiba shale gas field, the content of free gas is more than twice the content of adsorption gas. The content of shale gas increases with layer deep, the total gas content is larger under lower laryer, the content of free gas is larger. So, it is the optimal ＂dessert＂ interval and typical class I gas layer, which provides the beneficial reference for further development of gas fields.