Have you looked at the Virginia land records (online) at the Library of Virginia? You can just enter John Wilkins (who deeded the land to the Abneys) in the search field and find his original grants. You can also see several records for the Abneys there.
http://lva1.hosted.exlibrisgroup.com/F/?func=file&file_name=find-b-clas30&local_base=CLAS30&_ga=2.262232335.2099413825.1542203374-805313012.1536841750