南川区块五峰-龙马溪组页岩气储层测井评价方法

本文以常规测井资料为基础,以数理模型和相关性分析为主要手段,开展页岩气储层测井评价。研究以南川区块页岩气为例,考虑超压-常压等地质背景差异影响,首次分构造类型(背斜及斜坡带)分别建立测井解释模型；考虑到黄铁矿等导电矿物对电阻率饱和度法的不利影响,采用非电法饱和度模型。文中系统建立了包括页岩矿物组分、有机碳含量、孔隙度、含气饱和度、吸附气含量、游离气含量、总含气量及脆性矿物组分测井解释模型。通过与实验分析数据对比及实际井处理解释,验证了模型的准确性及方法的实用性,正在气田内推广和使用。

Logging evaluation method for shale gas reservoirs of Wufeng-Longmaxi Formation in Nanchuan block

Based on conventional logging data, this paper uses mathematical model and log curve fitting analysis as the main means to carry out logging evaluation of shale gas reservoirs. The study takes shale gas in the Nanchuan block as an example, considering the influence of geological differences between overpressure gas layers and normal pressure gas layers,an interpretation model was established for different structural types (anticline zone and slope zone) for the first time, Considering the adverse effects of conductive minerals such as pyrite on the resistivity saturation method, a non-electrical saturation model is used; Interpretation model of shale mineral composition, organic carbon content, porosity, gas saturation, adsorbed gas content, free gas content, total gas content, and brittle mineral was established in this paper. The accuracy of the model and the practicability of the method are verified by comparison with experimental analysis data and interpretation of actual well processing, and It is being promoted and used in gas fields.