A Strategic Gasfield Development Case in Sandstones Using Seismic Amplitudesand Dynamic Reservoir Characterization

摘要

The objective of this paper is to present a process forrnimproving the planning of gas field development. We discussrnhow seismic amplitudes and dynamic characterization can berncombined to optimize gas field development. The mainrnconcepts, methodologies, and tool used, as well as resultsrnobtained are shown for an actual Mexican gas field. A seriesrnof amplitude seismic maps were constructed by using 3Drnseiesmic interpretation. These maps were the essential part forrndetecting significant volumes of gas in place. Afterwards,rncalibrations of these maps with production data used in reservernevaluation studies resulted in a low risk development strategyrnfor the field. The gas field example is comprised of threernproducing sandstones at different depths (E, G, and M), andrnhas 14 producing wells. Hydraulic communication and therndrainage areas for each reservoir, in both E and M sandstones,rnwere evaluated through a combination of the amplitude in thernseismic anomalies and production data analysis. A goodrnagreement between the seismic amplitude and dynamicrncharacterization of the pressure and production data wasrnobtained, which improved the evaluation of the reservoirrnquality and the estimation of drainage area, original gas inrnplace, and proved reserves. In E and M sandstones, four andrnthree independent reservoirs have been detected, respectively.rnThe E sandstone has an estimated value of 62 Bscf of originalrngas in place and the M sandstone has an estimated value ofrn110 Bscf of original gas in place. By using the reservoirrndynamic model in combination with information of logs,rncores, and production data, the economic optimum strategy forrnthe field development was designed, that included the drillingrnof wells in areas with the best seismic amplitude.