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

摘要

The present invention relates to a method for estimating a slowness value, Young′s modulus, a Poisson′s ratio, and brittleness of a horizontal drilling zone in a sweet spot range using resistivity and neutron logging data in a shale play. The slowness value of the horizontal drilling zone in the sweet spot range is estimated using a combination of resistivity logging data and neutron logging data for the horizontal drilling zone in the sweet spot range, without using acoustic log. A correlation between the slowness value and the Young′s modulus and a correlation between the slowness value and the Poisson′s ratio which are suitable for a regional characteristic are derived in the sweet spot range of a vertical drilling zone. After the slowness value of the horizontal drilling zone in the sweet spot range is estimated, the Young′s modulus and the Poisson′s ratio within the horizontal drilling zone in the sweet spot range can be estimated using the value. When the Young′s modulus and the Poisson′s ratio are estimated, the brittleness of the entire horizontal drilling zone in the sweet spot range can be reliably estimated using these values.