Under the offer, which has received the unanimous support of Roma's directors, QGC will pay 10c and 0.0177 QGC shares for each Roma share.

QGC has also entered into a pre-bid acceptance agreement with Oil Drilling & Exploration, under which OD&E will accept QGC's offer for its 19.16% shareholding in Roma.

QGC managing director Richard Cottee said the acquisition of Roma's interests would expand QGC's coal seam gas acreage.

Meanwhile, VicPet said it had completed a placement of 41.75 million shares at 22.5c each to QGC to raise almost $9.4 million.

Following the placement, QGC will become the largest shareholder in VicPet with a 19.24% interest.

Funds raised by this placement will used for accelerated exploration and development of VicPet's ATP574P (30%), ATP593P (45%) and ATP771P (45%) CSM permits in the Surat Basin, Queensland.

QGC has also agreed to complete with VicPet a gas marketing agreement covering the sale of future gas produced from ATP574P and a technical advisory agreement that will provide VicPet with access to QGC's CSM technology and expertise.

VicPet also holds a 20% stake in the Roma-operated PL 171 - also in the Surat - that is prospective for coal seam methane.

PL 171 is close to QGC's ATP 651P and adjacent to QGC's ATP 574P.

It is also near the proposed pipeline for the 3-4 million tonne per annum Queensland Curtis LNG project being undertaken by QGC and BG Group.