鲁卜哈里盆地志留系热页岩特征及成熟度演化史

根据钻井资料，分析了鲁卜哈里盆地志留系底部热页岩在盆地内的发育状况。对岩心、岩屑样品进行了TOC测定、热解分析及镜质体反射率测定，认为热页岩演化已达成熟—高成熟阶段，有的甚至是过成熟阶段。对样品干酪根、沥青“A”及其族组分的碳同位素分析，确定了有机质类型为II型。利用PetroMod盆地模拟软件，对3口探井进行埋藏史、热史和成熟度史模拟，并对对外合作区块热页岩进行成熟度演化史模拟，认为该区块志留系底部热页岩由深凹至东部斜坡各阶段的演化时间依次变晚，凹陷区热页岩在早二叠世均已进入成熟演化阶段；而东部斜坡热页岩于早三叠世末—晚侏罗世末期才进入成熟演化阶段。

Characteristics and maturity evolution history of Silurian hot shales in Rub Al Khali Basin

The geological conditions of hot shales at the bottom of Silurian in the Rub Al Khali Basin were studied based on well drilling data. The w(TOC) test, pyrolysis analysis and Ro test of core and cutting samples were made, indicating that the hot shales are in the mature-high-mature and even over-mature stages. Through the carbon isotopic analyses of kerogen, bitumen “A” and group composition, organic type was confirmed as type II. By means of PetroMod Basin simulation software, the burial history, thermal history and maturity history of 3 wells were simulated. The maturity history of hot shales in contract blocks was simulated as well. The simulation results can be concluded that the forming age of Silurian hot shales in the Rub Al Khali Basin becomes later from the deep sag to the eastern slope, and the hot shales in the deep sag have entered into mature period since the Early Permian; however, the hot shales on the eastern slope became mature from the end of the Early Permian to the end of the Late Jurassic.