US 12,474,502 B2
Generating synthetic borehole image logs
Weihua Wang, Dhahran (SA); Yunsheng Li, Dhahran (SA); Ibrahim A. Makrami, Dhahran (SA); and Maan A. Hawi, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jul. 17, 2023, as Appl. No. 18/353,528.
Prior Publication US 2025/0028071 A1, Jan. 23, 2025
Int. Cl. G01V 11/00 (2006.01); E21B 7/04 (2006.01); E21B 44/00 (2006.01); E21B 47/002 (2012.01); E21B 47/026 (2006.01); E21B 49/00 (2006.01)
CPC G01V 11/002 (2013.01) [E21B 44/00 (2013.01); E21B 47/0025 (2020.05); E21B 47/026 (2013.01); E21B 49/00 (2013.01); E21B 7/04 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for generating synthetic borehole image logs, the method comprising:
logging rate of penetration (ROP) data, resistivity data, and gamma ray data while drilling a borehole in a subsurface formation to generate logged data;
determining an effective dip angle of the subsurface formation along the borehole;
generating a depth shift table based on the effective dip angle and a well deviation angle, the well deviation angle being between the borehole and a vertical reference;
generating datasets based on the ROP data, resistivity data, and gamma ray data, the generated datasets having higher sampling rates than the logged data;
generating synthetic borehole images based on the generated datasets and the depth shift table; and
orienting the synthetic borehole images with respect to a reference point of the borehole,
wherein determining an effective dip of the subsurface formation comprises:
determining a vertical distance between a first true depth location of a surface in the borehole and a second true depth location of the surface in a mother bore associated with the borehole;
determining a horizontal distance between the first and second true depth locations; and
determining the effective dip angle based on the vertical distance and the horizontal distance.