渝东北地区巫溪2井五峰组—龙马溪组页岩气储层及含气性特征

发布时间：2018-04-04 08:34

本文选题：页岩气储层　切入点：生物地层　出处：《石油学报》2017年05期

【摘要】：为深入研究渝东北巫溪地区五峰组—龙马溪组页岩气储层及含气性特征,以巫溪2井钻井资料为基础,以笔石生物地层作为黑色页岩地层划分对比的"标尺",对富有机质页岩有机地球化学特征、岩石学特征、储集空间类型及特征等进行系统分层研究,并分析其含气性及影响因素。研究结果表明:巫溪2井五峰组—龙马溪组富有机质页岩厚度达89.8 m,笔石序列发育完整连续;有机质类型好、丰度高、热演化程度适中,生烃条件较好;有机质丰度受沉积速率的影响,缓慢的沉积速率有利于黑色笔石页岩有机质的富集;由顶至底硅质含量逐渐增加,黏土矿物含量逐渐减少,脆性逐渐增强;富有机质硅质页岩、黏土质硅质页岩具有"既甜又脆"的特性,为页岩储层发育的优势岩相;纳米孔隙形态多为四边开放平行板状孔,连通性较好;联合孔径分布曲线具有"多峰"特征,主孔位于0.42~0.62nm、3~5nm段;有机质孔、黏土矿物层间孔对总孔容贡献最大,脆性矿物间孔的贡献最小;由顶至底有机质孔隙逐渐增多,黏土矿物层间孔逐渐减少;现场实测岩心含气量最高超过8 m~3/t,含气性受生烃、储集和保存条件的综合控制;凯迪阶沉积期—埃隆阶沉积早期(WF2—LM6带)对应Ⅰ类优质页岩气储层,赫南特阶LM1带为最佳层段,具有"最甜、最脆"的特性,可作为水平井最佳靶体位置"甜点段"。
[Abstract]:In order to study the shale gas reservoir and gas-bearing characteristics of Wufeng formation and Longmaxi formation in Wuxi area of northeast Chongqing, the drilling data of well Wuxi 2 are taken as the basis.With graptolite biostratigraphy as the "scale" for the classification and correlation of black shale strata, the organic geochemical characteristics, petrological characteristics, reservoir space types and characteristics of organic shale rich in organic matter are systematically stratified.The gas content and its influencing factors were analyzed.The results show that the thickness of organic shale of Wufeng formation and Longmaxi formation in Wuxi 2 well is 89.8 m, the graptolite sequence is complete and continuous, the organic matter type is good, the abundance is high, the thermal evolution degree is moderate, and the hydrocarbon generation condition is better.The abundance of organic matter is affected by the deposition rate, the slow deposition rate is favorable to the enrichment of organic matter of black graptolite shale, the content of siliceous matter from top to bottom increases gradually, the content of clay ore decreases gradually, the brittleness of clay increases gradually, and the siliceous shale is rich in organic matter.The clay siliceous shale has the characteristics of "sweet and brittle", which is the dominant lithofacies developed in the shale reservoir; the nano-pore morphology is mostly open parallel plate pore with good connectivity, and the associated pore size distribution curve has the characteristic of "multi-peak".The main pore is located at 0. 42 ~ 0. 62 nm ~ 3 ~ 5 nm, organic pore, clay mineral interlayer pore has the largest contribution to total pore volume, while brittle mineral interlayer pore has the least contribution, and organic matter pore increases gradually from top to bottom, and clay mineral interlayer pore decreases gradually.The gas content of the core measured in situ is up to 8 mm3 / t, and the gas content is controlled by the hydrocarbon generation, reservoir and preservation conditions. The Keti stage sedimentary period and the early stage of Elon stage (WF2-LM6 zone) correspond to the type I high quality shale gas reservoir.The Hernant stage LM1 zone is the best layer with the characteristics of "sweetest and most brittle", and can be used as the best target "dessert section" in horizontal wells.
【作者单位】：中国石油勘探开发研究院廊坊分院;国家能源页岩气研发(实验)中心;中国石油天然气集团公司非常规油气重点实验室;
【基金】：国家重大科技专项(2017ZX05035) 国家重点基础研究发展计划(973)项目(2013CB228000)资助
【分类号】：P618.13

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