In all cases mentioned in this Chapter, the indictment or information, or any pleading in the case, may allege that the offense was committed in the county where the prosecution is carried on. To sustain the allegation of venue, it shall only be necessary to prove by the preponderance of the evidence that by reason of the facts in the case, the county where such prosecution is carried on has venue.
Tex. Code Crim. Proc. § 13.17