渝东南五峰-龙马溪组优质页岩储层脆性评价
首发时间:2020-03-30
摘要:页岩储层的脆性对于页岩气的开发有着极其重要的意义,脆性指数是反映储层脆性最直观的参数。渝东南地区页岩气重点勘探开发层位为上奥陶统五峰组-下志留统龙马溪组,优质储层段为五峰-龙马溪一段。研究表明,高脆性等级的页岩具有低泊松比和高杨氏模量的基本特征,但脆性矿物相对分布指数对脆性也有影响。在岩石力学实验基础上,通过脆性矿物和黏土矿物等分析计算,分别利用岩石物理参数和矿物组分求取了脆性指数,比较了二者优缺点,进而组合了岩石物理参数和矿物组分得到新的脆性指数求取公式,最终对南川地区优质页岩储层段脆性进行了综合评价。与实测脆性对照,新公式具有良好效果;南川地区五峰-龙马溪组一段平均脆性大于70%,横向分布稳定,具有良好的压裂条件。
关键词: 地质学 脆性指数 杨氏模量 泊松比 渝东南 五峰-龙马溪组
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Brittleness Evaluation of Wufeng and Longmaxi Formation high quality shale reservoir in southeast of Chongqing
Abstract:The brittleness of shale reservoirs is of great significance for shale gas development. The brittleness index is the most intuitive paramet er reflecting reservoir brittleness. The key exploration and development strata of shale gas in Pengshui area of southeastern Chongqing are Wufeng Formation of Upper Ordovician and Longmaxi Formation of Lower Silurian, And the high quality shale reservoir is Wufeng-Long 1 section. The results show that the high brittleness grade of shale corresponds to low Poisson\'s ratio and high Young\'s modulus, but the relative distribution index of brittle minerals also afBrittleness Evaluation of Wufeng and Longmaxi Formation high quality shale reservoir in southeast of Chongqingfects brittleness. Through the analysis and calculation of brittle minerals and clay minerals in reservoir, the brittle index is calculated by using rock physical parameters and mineral composition, and the advantages and disadvantages of the two are compared. Then a new formula for calculating brittleness index is obtained by combining rock physical parameters and mineral composition. Finally, the brittleness of high quality shale reservoir in Pengshui area is evaluated comprehensively. Compared with the measured brittleness, the new formula has good effect. The average brittleness index of the Wufeng-Long 1 is more than 70% in Nanchuan area, China. The lateral distribution is stable and the fracturing conditions are good.
Keywords: geology brittleness Young\'s modulus Poisson\'s ratio southeast of Chongqing Wufeng-Longmaxi Formation
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