苏北盆地阜二段页岩储层力学特征评价
Mechanical characteristics evaluation of the Fu2 member shale reservoir in the Subei Basin
殷玉平 1金智荣 1杲春 1何雷宇 1葛艳蓉1
作者信息
- 1. 中国石化江苏油田分公司石油工程技术研究院,江苏扬州 225007
- 折叠
摘要
为认识苏北盆地阜二段页岩储层力学特征、可压性、裂缝延伸规律,以HY1 井岩心为研究对象开展了矿物成分分析、三轴岩石力学实验、地应力大小和方向实验,为区块可压性评价和压裂工艺优化提供了技术支撑.研究表明,高邮凹陷阜二段以方解石(23.9%)、石英(22.7%)和黏土矿物(21.3%)为主.平均脆性指数 58.6,页 1～2 小层平均脆性指数69.7,页3 小层平均脆性指数 57.9,页 4～5 小层平均脆性指数 48.4;高邮凹陷阜二段岩心平均泊松比为 0.183、平均杨氏模量为15 469.6 MPa.应力应变曲线表明,阜二段岩心主要表现出弹性特征;高邮凹陷阜二段垂向应力(81.00～83.00 MPa)最大、最小水平主应力(60.00～64.00 MPa)最小、最大水平主应力(73.00～76.00 MPa)居中,最大水平主应力方向为N43.76E;阜二段矿物脆性相对较高,脆性指数较高,平均应力差异系数 0.2,可形成一定分支缝,有利于形成复杂裂缝.
Abstract
In order to understand the mechanical characteristics,compressibility and frac-ture extension law of shale reservoir in Fu2 member of Subei Basin,mineral composition analysis,triaxial mechanical experiment,and in-situ stress magnitude and direction experi-ment were carried out with the core of HY1 well as the research object,which provided technical support for block compressibility evaluation and fracturing process optimization.The results show that calcite(23.9%),quartz(22.7%)and clay minerals(21.3%)dominate the Fu2 member of Gaoyou Sag.The average brittleness index is 58.6,the average brittleness of page 1～2 layer is 69.7,the average brittleness index of page 3 layer is 57.9,and the aver-age brittleness index of page 4～5 layer is 48.4.The core average Poisson's ratio and average Young's modulus of Fu2 member in Gaoyou Depression are 0.183 and 15 469.6 MPa.The stress-strain curve shows that the core of the Fu2 member mainly exhibits elastic characteris-tics.The maximum vertical stress(81.00～83.00 MPa)and minimum horizontal principal stress(60.00～64.00 MPa)are in the middle,and the maximum horizontal principal stress(73.00～76.00 MPa)is in the direction of N43.76E.The mineral in Fu2 member is relatively brittle,the brittleness index is high,and the average stress difference coefficient is 0.2,which can form a certain branch joint,which is beneficial to the formation of complex cracks.
关键词
矿物成分/三轴应力/力学参数/地应力Key words
mineral composition/triaxial stress/mechanical parameters/crustal stress引用本文复制引用
出版年
2024
NETL
NSTL
万方数据