External email to Cardiff University - Take care when replying/opening attachments or links. Nid ebost mewnol o Brifysgol Caerdydd yw hwn - Cymerwch ofal wrth ateb/agor atodiadau neu ddolenni. Dear group , With most respect fully want to deeply understand the natural mystery, even expulsion of oils and gas from sedimentary source rocks is scientifically true and correct. Thanks Warm regs Suresh