页岩储层可压性剖面模型研究及应用

RESEARCHES AND APPLICATION OF THE MODEL FOR THE CRUSHABILITY SECTIONS IN SHALE RESERVOIRS

水力压裂是有效开发页岩储层的关键技术,页岩的可压裂性是评价页岩储层被有效压裂程度的一个定性指标.岩石力学实验、全岩分析等常规方法因受取心层段、成本等限制,求取的可压性指数存在片面、不连续等缺点.借助测井方法代替常规方法求取目标储层岩石力学参数与矿物组成,结合岩石脆性、矿物组分、成岩作用等影响因素建立了单井可压性剖面模型,利用模型计算了孔南地区页岩储层可压性剖面并对其进行了定量评价,模型方法与实验方法的计算结果较为一致.可压性剖面模型的应用,实现了对整个储层的连续评价,可为页岩储层有效开发提供准确参考依据.

Hydraulic fracturing is the key factor in the effective development of shale reservoirs. The shale crush- ability is an important qualitative index to evaluate the effective fracturing degree of the shale reservoirs. Due to the limitation of the sampling intervals, cost and so forth for the conventional methods such as the rock mechanical ex- periment, full-rock analyses and so on, there are the following demerits for the acquirement of the crushability in- dex： incomplete, discontinuous and so forth. With the help of the well logging methods replacing the above conven- tional ones, the mechanical parameters and mineral compositions are sought for the target reservoirs, and moreover integrating with the influencing factors including the rock fragility, mineral components, diagenesis and so on, the model of the individual well＇ s crushability sections is established, and then by means of the model calculation, the crushability sections of the shale reservoirs in Kongnan area are computed and furthermore the corresponding quantitative evaluation is conducted, the calculated results from the model and experimental methods are well coordinate.The application of the crushability section model has realized the connected evaluation of the whole reservoirs, thus the accurate references and evidences can be presented for the effective development of the shale reservoirs.