I looked up your area on DrillingInfo.com - very poor area for Eagle Ford / too far north and in an area with heavier oil and lower reservoir energy.
Multiple operators have drilled in this part of the trend (basically north of the line that runs SW to NE through Giddings) with less than economic success. New Century and Silver Tusk have sub economic wells (horizontals) located NW of your survey while Marlin's horizontal directly offsetting your survey is at best an "OK" well. 6000' lateral that has made about 94 MBO & 28 MMCF today - recent month on file (Dec 2017) shows a production increase to about 4300 BO & 890 MCF for the month.
Projected reserves here below the production thresholds to make money assuming a $6-7 Million well.
Definite reason why Marlin did not renew your lease.
Horizontal targets in this area have included the Buda and Austin Chalk along with the Eagle Ford. All the older wells around your survey are shallow vertical wells (around 4000') in an old field area that has been pretty well played out.
Not trying to be negative - just the reality of the oil field.