샘플을 올립니다. 

\documentclass[chapter]{oblivoir}

\renewcommand{\contentsname}{Contents}
\renewcommand{\figurename}{Figure}
\renewcommand{\tablename}{Table}
\renewcommand{\indexname}{Index}
\renewcommand{\bibname}{Bibliography}

\makeatletter
\def\pre@chapter{Chapter }%
\def\post@chapter{}
\setlength{\cftchapternumwidth}{6em} %default 1.5em

\makeatother
\begin{document}
\tableofcontents
\chapter{Test1}
\section{Test11}

\chapter{Test2}
\section{Test22}

\end{document}