Because the dependency of compaction on the rate of depletion is ignored, currently used procedures for predicting compaction are inaccurate. A partly analytical, partly empirical model is presented for calculating oil and gas production, subsurface compaction, and surface subsidence from compacting reservoirs with rate-dependent compressibilities and all major drive mechanisms active. A compacting Bolivar coast reservoir is simulated with excellent results. Limitations include zero water production, piston-like gas and water influx, and negligible gravity drainage.

This paper was selected for presentation by an SPE Prognun Committee following review of information contained in an abstract submitted by tho autbor(s). Contents of tho paper, as presented, have not been reviewed by tho Society of Petroleum. Engineers and are subjected to oorrcction by tho autbor(s). The material, as presented does not neoessarily reflect any position of tho Society of Petroleum. Engineers, its offioers, or members. Papers presented at SPE meetings are subject to publication review by Editorial Committees of tho Society of Petroleum. Engineers. Permission to ropy is restricted to an abstract of not more than 300 words. lliustrations my not be oopied. The abstract sboold oontain OOI18piC\lOU8 acknowledgement of where and by whom tho paper was presented. WriteLibrarian, SPE, P.O. Box 833836, Richardson, TX75083-3836, U.S.A., fax 01-214-952-9435. AbstractThis paper presents the first field scale measurements of insitu stress effects on permeability of coal seams. The importance of these effects on a highly compressible reservoir such as coal is demonstrated by relating permeability and production to stress.Well testing complications and the implications of stress toward exploitation of existing reserves and exploration for new reserves are also discussed. Additionally, comparisons of this paper's findings to prior theoretical work, core testing, and limited field data are presented.