METHOD FOR SELECTING FRACKING INTERVALS OF HORIZONTAL DRILLING ZONE IN SWEET SPOT RANGE USING RESISTIVITY AND DENSITY LOGGING DATA IN SHALE PLAY

摘要

The present invention relates to a method for selecting fracking intervals of a horizontal drilling zone in a sweet spot range using resistivity and density logging data in a shale play. A slowness value of the horizontal drilling zone in the sweet spot range is estimated using a combination of resistivity logging data and density logging data for the horizontal drilling zone in the sweet spot range, without using acoustic log. A modulus of elasticity is derived in the sweet spot range of a vertical drilling zone, which can reliably figure out brittleness. Also, the potential amount of shale gas for each region of the horizontal drilling zone in the sweet spot range is estimated. Since the brittleness and the potential amount of the gas for the horizontal drilling zone in the sweet spot range of the shale gas are figured out, fracking in the horizontal drilling zone can be economically and effectively performed.