四川盆地焦石坝地区龙马溪组一段上部页岩气层地质特征及开发潜力  

Geological characteristics and development potential of upper shale gas reservoirs of the 1st member of Longmaxi Formation in Jiaoshiba area,Sichuan Basin

作　　者：舒志恒[1] 方栋梁 郑爱维[1] 刘超[1] 刘莉[1] 吉婧[1] 梁榜 SHU Zhi-heng;FANG Dong-liang;ZHENG Ai-wei;LIU Chao;LIU Li;JI Jing;LIANG Bang(Research Institute of Exploration and Development,Sinopec Jianghan Oilfield Company,Wuhan 430223,China)

机构地区：[1]中国石化江汉油田分公司勘探开发研究院,湖北武汉430223

出　　处：《天然气地球科学》2020年第3期393-401,共9页Natural Gas Geoscience

基　　金：国家科技重大专项“涪陵页岩气开发示范工程”(编号:2016ZX05060)资助.

摘　　要：涪陵页岩气田虽已取得巨大成功,但随着气田开发进入递减期,单井产量逐年递减,因此需寻找新的增产阵地。以四川盆地焦石坝地区龙马溪组一段上部为研究对象,在有机地球化学、全岩X-射线衍射、扫描电镜和岩心观察的基础上进行分析。结果表明,上部气层整体为Ⅱ类页岩储层,具有较优的地质条件。此外通过微地震监测等手段发现,下部气层井压裂形成的有效裂缝大部分未向上延伸至上部气层;上部气层井投产前地层压力比同期邻井的实测地层压力高21.03MPa,也证实上、下部气层未沟通,上部气层可单独开发。对上部气层评价井进行生产动态分析,计算单井技术可采储量,均达到较高的技术可采储量,具有良好的开发潜力。Fuling shale gas field has achieved great success,but with the development of the gas field entering the middle and late stages,the production of single well is decreasing year by year,so it is necessary to find new production increasing positions. Based on organic geochemistry,X-ray diffraction,scanning electron microscopy and core observation,the analysis results show that the upper shale gas reservoir belongs to class II shale reservoir,with good geological conditions. In addition,through micro seismic monitoring and other means,most of the effective fractures formed by fracturing of the lower gas reservoir well do not extend upward to the upper gas reservoir;the formation pressure of the upper gas reservoir well before production is 21.03 MPa higher than the measured formation pressure of the adjacent well in the same period,which also proves that the upper and lower gas reservoirs are not connected,and the upper gas reservoir can be developed independently. By analyzing the production performance of the upper gas reservoir evaluation wells and calculating the technical recoverable reserves of a single well,both of them have reached high technical recoverable reserves and have good development potential.

关 键 词：上部气层 地质特征 微地震监测 开发潜力 

分 类 号：TE132.2[石油与天然气工程—油气勘探]