What is an abiotic factor that can prevent the organism from becoming preserved

Groundwater.

Explanation:

Groundwater in this case is the primary abiotic factor that inhibits  organism from being preserved after been buried. After being buried, decomposers here becomes the biotic factors that eat up dead bodies.

It is also known that sedimentary basins encounters a certain change in its subsidence rate over time, and eustatic sea level changes continuously, causing depth to variations in groundwater and lakes, ocean temperature, spreading rates, continental collision and cracks, and sedimentation in ocean basins.

compost can be added to topsoil as a:

pesticide