Read yīn, 湮 is an alternate writing of 洇 - ink soaking and spreading on absorbent paper. This sense is far less common than the yān 'oblivion' reading.
The water radical in its three-drop left form, from 水. It carries the core image: to be submerged and silted over by water, which extends to being buried and forgotten by time. It groups 湮 with 沉, 没, and 淹.
phonetic
垔yīn
(phonetic component)
Supplies the sound (yīn shifting to yān). It also faintly evokes blocking up or filling in, suiting the silting sense, but it works mainly as a pronunciation marker.
