English to Spanish Law/Patents Petroleum Eng/Sci Oil operations

Son las cuentas anuales de una compañía petrolífera. Salen varios términos relacionados con instalaciones de extracción de petróleo, como "field" (que estoy traduciendo como "yacimiento"), o "development" ("explotación"). También hace referencia general a "facilities" (instalaciones), pero un término que aparece mucho es "properties", y no sé si en el sector habrá algún término que se use específicamente para ello. Ya estoy utilizando "instalaciones" para "facilities", y "propiedades" no lo veo adecuado, salvo que algún experto me diga que se utiliza habitualmente.

Ya he visto en una Kudoz que se habla de "emprendimientos" (también alguien sugirió "activos")... ¿alguna otra opción?

La traducción es para España.

"Gains (losses) on divestitures for 2011 included net losses of $54 million, primarily related to write-downs of $422 million of assets held for sale. In 2011, the Company began marketing certain domestic ***properties*** from the oil and gas exploration and production reporting segment and the midstream reporting segment in order to redirect its operating activities and capital investment to other area."

"The increase in 2012 impairments of unproved properties was primarily due to $845 million of impairments for certain unproved properties in the Rockies and the Gulf of Mexico. Approximately $721 million of the impairments were due to lower natural-gas prices associated with Powder River coalbed methane properties in the Rockies and $124 million related to a Gulf of Mexico natural-gas property that the Company does not plan to pursue under the forecasted natural-gas price environment. These increases were partially offset by 2011 impairments of certain unproved ***properties*** in the Gulf of Mexico of $124 million and Indonesia of $63 million due to decreases in the estimated recoverable cash flows."

Gracias de antemano.