Automated source rock net thickness prediction system and method

A system, comprising:

• a well logging system to obtain at least one well log from at least one a segment of a wellbore penetrating a subterranean region of interest;
• a well coring system to obtain a first plurality and a second plurality of core samples from the segment;
• an inductively coupled plasma-mass spectrometry and an X-ray fluorescence system to determine, for each of the first plurality of core samples, a relative abundance for a set of inorganic materials forming inorganic data;
• a pyrolysis system to determine, for each of the second plurality of core samples, a first yield (S1), a second yield (S2), and a third yield (S3);
• a computer processor, configured to:
• for each given core sample of the second plurality of core samples:
• determine, a hydrogen index (HI), an oxygen index (OI), a production index (PI), a normalized S1 (Norm_S1), and a total organic content (TOC) value based on the S1, S2, and S3;
• compare the HI, OI, PI, and Norm S1 to a corresponding organic material data cut-off condition;
• and
• discard the given core sample in response to any of the HI, OI, PI, and Norm S1 not satisfying a corresponding organic material data cut-off condition,
• determine a cross-checked total organic content (xc-TOC) matrix comprising the TOC value of each core sample of the second plurality of core samples that was not discarded,
• identify, based on the inorganic data, at least one sensitive element from the set of inorganic materials that correlates with the xc-TOC, wherein each of the at least one sensitive elements has either a corresponding high or low value that correlates to a high TOC value,
• discard, from the xc-TOC matrix, TOC values that, for each of the at least one sensitive elements, do not have a corresponding high or low sensitive element forming a validated total organic content (vTOC) matrix,
• determine a data portion and a prediction portion of the segment, based on sample locations of the second plurality of core samples, wherein the data portion and the prediction portion are mutually exclusive and the prediction portion excludes the sample locations of the second plurality of core samples,
• determine, in the data portion, depth ranges corresponding to source rock locations based on the TOC values of the vTOC,
• determine a measured source rock thickness based on the depth ranges,
• determine at least one cut-off value for each of the at least one well logs based, at least in part, on the vTOC,
• determine, in the prediction portion, zones of high TOC based on the at least one cut-off value for each of the at least one well log;
• predict a predicted source rock thickness by combining a thickness of each of the zones of high TOC,
• determine a net source rock thickness of the segment from a sum of the predicted source rock thickness and the measured source rock thickness, and
• identify a drilling target in the subterranean region of interest based, at least in part, on the net source rock thickness;
• and
• a drilling system configured to drill another wellbore or another segment of the wellbore to intersect the drilling target.