shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components. shale gas extraction in the petroleum engineering. this ppt will the reader to understand the shale gas extraction. the shale is generally methane and other minor components.