04877nas a2200481 a 4500 20260817162819.0 140127s2012 th r 000 eng d .b12125805 AIT Thesis no.OTM-12-01 Ratchapong Apisitsareekul Applicability of the gas material balance equation for multi-layered gas reservoirs Pathum Thani, Thailand : Asian Institute of Technology, 2012 152 leaves : ill. (some col.) Thesis ; no. OTM-12-01 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Offshore Technology and Management, School of Engineering and Technology Thesis (M. Eng.) - Asian Institute of Technology, 2012 Material balance equation or the P/Z plot method is a well-known application for original gas in place (OGIP) estimation. Therefore, it can be used to apply classic material balance equation to determine the original gas in place of multi-layered gas reservoirs, such as two layers, five layers, and ten layers. To apply the material balance model to estimate the OGIP of multi-layered gas reservoirs, Multi-layered gas reservoirs that are heterogeneous make OGIP estimation erroneous. This study uses a reservoir simulator to simulate cases with multi-layered gas reservoir in order to demonstrate the application of the method. The simulated production and pressure profiles will be used as input data for material balance to determine total OGIP for all layers and different scenarios which appear from various reservoir properties, such as area, thickness, porosity, and permeability. The P/Z will be plotted versus cumulative gas production generated from numerical simulation to estimate OGIP of multi-layered gas reservoir. Moreover, gas rate of each layer is relative with pressure in each layer. It affects the change of average field pressure in well. The percentage error of OGIP estimation is small when pressure of each layer is close to average field pressure. Average field pressure that comes from weight average of hydrocarbon pore volume makes P/Z plot linear on material balance in every case of the change contrast. OGIP estimation is close to actual OGIP. However, average field pressure cannot be used in practice because parameter of hydrocarbon pore volume has difference in each place of reservoir. Therefore, this study has assumption about using proportional gas rate for weight average in pressure of each layer instead of average field pressure. Pressure that get from weight average by proportional gas rate is used for P/Z plot on material balance to find OGIP estimation. Pressure that comes from weight of proportional gas rate is similar to pressure that comes from average field pressure. This OGIP estimation will still be close to actual OGIP. Results from this study will help us to determine conditions that material balance provides acceptable estimation of total OGIP from multi-layered reservoirs. Gas reservoirs Material balances Chiu, Gregory L.F., Chairperson Suwat Athichanagorn, Examination committee Pornpong Asavadorndeja, Examination committee Royal Thai Government Fellowship, Scholarship donor Asian Institute of Technology. Thesis; no. OTM-12-01 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B03620 .b12125805 mnait z 250417 0 140127 m a z 0 000:001:PDF:b1212580:001154:0:0:0:0:0:0 Abstract--AIT Thesis no.OTM-12-01 n mnait mnait mnarc mnarc mnarc 20 40 Barcode : 30050120685507 CREATED : 2014-01-27 RECORD # : i12753749 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120685515 CREATED : 2014-01-27 RECORD # : i12753750 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160006036 CREATED : 2016-03-23 RECORD # : i12906815 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211014377 CREATED : 2021-12-16 RECORD # : i13356926 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211014401 CREATED : 2021-12-16 RECORD # : i13356938 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 6398 6398 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.OTM-12-01 30050120685507 2026-08-17 16:28:19 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.OTM-12-01 30050120685515 2026-08-17 16:28:19 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.OTM-12-01 30050160006036 2026-08-17 16:28:19 1 2026-08-17 40 0 0 0 0 MAIN MAIN mnarc 2026-08-17 50.00 0 AIT Thesis no.OTM-12-01 30050211014377 2026-08-17 16:28:19 3 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 50.00 0 AIT Thesis no.OTM-12-01 30050211014401 2026-08-17 16:28:19 4 2026-08-17 20