PRESS RELEASE For immediate release: 30 June 2005 OHM awarded first contract offshore Sarawak, Malaysia Offshore Hydrocarbon Mapping plc (OHM) announced today that the company, together with Malaysian partner, Petra Resources Sdn Bhd (Petra), has been awarded a contract by Newfield Sarawak Malaysia Inc. (Newfield) to acquire and process controlled source electromagnetic data over a number of prospects in the Deep Water Block 2C, offshore Sarawak. The contract, which is OHM’s first in South East Asia will commence in early August. OHM will undertake the survey planning, data acquisition and processing and Petra will provide the vessel and logistical support for the operation. OHM CEO, Dave Pratt said, “We are delighted to have secured this contract for a new client in a new area and with a respected local partner. This award further demonstrates that the Controlled Source Electromagnetic imaging technique is becoming accepted as a vital component of the explorer’s toolkit.” Ends Contact OHM: Dave Pratt Chief Executive Officer Aquila Financial Limited: Peter Reilly 020 7849 3319 William Davidson 020 7849 3320 www.ohmsurveys.com 0870 429 6581 peterreilly@aquila-financial.com williamdavidson@aquila-financial.com Notes to Editors OHM’s survey method transmits an electromagnetic field into the earth, which is modified by the presence of subsurface resistive layers. These changes in the field are measured and the resulting data is processed to provide information on the resistive structure of the subsurface. Because hydrocarbon accumulations are generally very resistive, this method can indicate the presence of oil and gas in deep water situations, and can detect and map the edges of such accumulations. This reduces the risk of drilling non-commercial exploration wells and can reduce the need for appraisal drilling, thereby creating considerable value for oil explorers.