天然气工业2018，Vol.38Issue(2)：43-50,8.DOI:10.3787/j.issn.1000-0976.2018.02.006
页岩气工程甜点评价方法——以四川盆地焦石坝页岩气田为例
An evaluation method of engineering sweet spots of shale gas reservoir development: A case study from the Jiaoshiba Gas Field, Sichuan Basin
摘要
Abstract
The quantitative evaluation of engineering sweet spots in shale gas reservoir development provides important reference for forecast on difficulties and costs in such projects.In this paper,the Jiaoshiba Shale Gas Field in the Siehuan Basin was taken as an example to search for a high-precision quantitative engineering sweet spot evaluation method.Firstly,the effects of engineering sweet spot parameters (e.g.brittleness index,stress difference coefficient,shale content and fracture pressure) on fracturing sand volume and fluid volume were qualitatively analyzed.Then,a quantitative analysis was conducted by means of the correlation coefficient to determine principal engineering sweet spot parameters and the corresponding target evaluation indexes which characterize shale gas reservoir development.Finally,such shale gas engineering sweet spots were evaluated based on three models (i.e.,single parameter model,radar area model and independence weight coefficient model) and the evaluation results were compared.The following research results were obtained.First,shale content,brittleness index,calcareous content and stress difference coefficient are the main engineering sweet spot parameters.Second,the multi-target evaluation problem,which occurs when the engineering sweep spot is characterized by using sand volume and fluid volume,can be avoided effectively by characterizing the engineering sweet spots by means of sand carrying ratio.Third,the evaluation precision of engineering sweet spots is the highest in the independence weight coefficient model,secondary in the radar area model and the lowest in the single parameter model.Field application effects in three fracturing wells also show that the quantitative evaluation result of engineering sweet spots in shale formations by the independence weight coefficient model is reliable.To sum up,it is appropriate to adopt the independence weight coefficient model to quantitatively evaluate the engineering sweet spots in shale gas reservoir development.关键词
页岩气/工程甜点/携砂比/脆性指数/地应力差异系数/破裂压力/四川盆地/焦石坝页岩气田Key words
Shale gas/Engineering sweet spot/Sand carrying ratio/Brittleness index/Ground stress difference coefficient/Fracture pressure/Sichuan Basin/Jiaoshiba Gas Field引用本文复制引用
廖东良,路保平..页岩气工程甜点评价方法——以四川盆地焦石坝页岩气田为例[J].天然气工业,2018,38(2):43-50,8.基金项目
国家自然科学基金项目“水平井随钻阵列感应测井环境动态建模及参数估计”(编号:41474108)、中国石油化工股份有限公司科技攻关项目“基于XRF的页岩地层多参数实时求取方法及应用”(编号:P17014-9). （编号:41474108）
