石油实验地质2017，Vol.39Issue(2)：147-153,7.DOI:10.11781/sysydz201702147
保存条件对四川盆地及周缘海相页岩气富集高产的影响机制
Effects of preservation conditions on enrichment and high yield of shale gas in Sichuan Basin and its periphery
摘要
Abstract
The main controlling factors of shale gas preservation conditions and evaluation of the Niutitang and Wufeng-Longmaxi formations in the Sichuan Basin and its periphery, were considered in view of typical shale gas wells in different regions with different gas contents and production. The preservation conditions of shale gas were controlled by several factors such as the roof and bottom rocks, the sealing properties of shale itself, the structural reformation degree, and the timing of when the shale reservoirs were reformed, etc. Adjacent rock conditions and its sealing effect was the basic factor determining whether the early formed hydrocarbons were pre-served. Late tectonic activity controlled the effusion, degree and abundance of shale gas, and it was a key factor in shale gas preservation. Meanwhile, we found that preservation conditions had an obvious effect on gas content, porosity, electrical resistivity, water saturation and gas composition. With poor preservation conditions, the gas content, porosity and resistivity were low, but water saturation and N2 content were high. All these parameters could be used as indirect indexes of shale gas preservation evaluation. A preservation evaluation system with 5 types and 28 parameters for the Lower Paleozoic marine shale gas was set up, illustrating the time and space combination of sealing conditions, the sealing properties of shale itself, and tectonic effects ( structural reformation time and degree, fault ) . The parameters of gas-bearing capacity of shale layer and the pressure coefficients also guide the evaluation of preservation conditions.关键词
保存条件/含气性表征参数/页岩气/牛蹄塘组/五峰—龙马溪组/四川盆地及周缘Key words
preservation condition/characterization parameters of gas bearing capacity/shale gas/Niutitang Formation/Fufeng-Longmaxi formations/Sichuan Basin and its periphery分类
能源科技引用本文复制引用
魏祥峰,李宇平,魏志红,刘若冰,余光春,王庆波..保存条件对四川盆地及周缘海相页岩气富集高产的影响机制[J].石油实验地质,2017,39(2):147-153,7.基金项目
中国石化科技部基础研究项目(P15074)和中国地质调查局地质调查项目(12120115003901)资助. （P15074）
