Methods of Treating a Wellbore for Enhancing Productivity of a Subterranean Reservoir

A method of analysis of a subterranean reservoir during a drilling operation and conducting a subsequent fracturing operation in a wellbore in the subterranean formation, the method comprising:

• obtaining a plurality of rock samples from a borehole as the borehole is drilled horizontally through the subterranean formation, wherein the plurality of rock samples comprises rock samples collected from the borehole at predetermined sampling locations in the borehole, wherein the predetermined sampling locations are located at substantially equal intervals;
• conducting a mercury injection capillary pressure (MICP) test on each rock sample to obtain MICP data, wherein the MICP data comprise a measure of accessible pore compressibility of the rock sample and a measure of inaccessible pert of rock (IRP) compressibility of the rock sample;
• conducting a crushed sample test on each rock sample to obtain a measurement of total porosity of each rock sample;
• obtaining for each rock sample (1) a connected porosity measurement based on the measure of accessible pore compressibility, and (2) an inaccessible porosity measurement based on the measure of IRP compressibility;
• calculating a connected porosity value for each rock sample, wherein the connected porosity value is the ratio of the connected porosity measurement to total porosity measurement of the rock sample, wherein the connected porosity value is in a range between 0 and 1;
• assigning the connected porosity value of each rock sample to the corresponding predetermined sampling location in a wellbore formed by casing the borehole, wherein the corresponding predetermined sampling location approximately determines a midpoint of a frac stage in the wellbore, and the connected porosity value represents the connected porosity of the frac stage;
• plotting a cumulative distribution of the connected porosity values and selecting therefrom at least a kith percentile, a k2th percentile, and a k3th percentile, wherein the k1th percentile is <100, the k2th percentile is <k1th percentile, and the k3th percentile is <k2th percentile;
• assigning each frac stage to one of a first percentile range a second percentile range, a third percentile range or a fourth percentile range of the cumulative distribution according to the corresponding connected porosity value of the fac stage, wherein (1) the first percentile range includes the fac stages with connected porosity values >k1th percentile, (2) the second percentile range includes the fac stages with connected porosity values >k2th percentile and ≤k1th percentile, (3) the third percentile range includes the fac stages with connected porosity values >k3th percentile and ≤k2th percentile, and (4) the fourth percentile range includes the fac stapes with connected porosity values ≤k3th percentile;
• selecting a baseline perforation-hydraulic fracturing procedure to conduct in a fac stage of the wellbore, wherein the baseline perforation-hydraulic fracturing procedure comprises executing at least one duster of perforations followed by fracking;
• and
• executing a plurality of the baseline perforation-hydraulic fracturing procedures in the wellbore, wherein X1 baseline perforation-hydraulic fracturing procedures are conducted in each fac stage of the first percentile range X2 baseline perforation-hydraulic fracturing procedures are conducted in each fac stage of the second percentile range, X3 baseline perforation-hydraulic fracturing procedures axe conducted in each fac stage of the third percentile range and X4 baseline perforation-hydraulic fracturing procedures axe conducted in each fac stage of the fourth percentile range, wherein X1-X4 are integers, and wherein X1>X4.