by Agus M. Ramdhan, and Neil R. Goulty

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by Agus M. Ramdhan, and Neil R. Goulty Two-step wireline log analysis of overpressure in the Bekapai Field, Lower Kutai Basin, Indonesia by Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience Volume 24(2):208-217 May 1, 2018 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Map of the Lower Kutai Basin showing fields and wells referred to in the text. Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience 2018;24:208-217 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Schematic cross-section of the Neogene petroleum system (simplified from Duval et al. 1998). Schematic cross-section of the Neogene petroleum system (simplified from Duval et al. 1998). The giant Bekapai oil and gas field lies approximately 10 km south of the supergiant Tunu gas field. Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience 2018;24:208-217 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Vertical section through the Bekapai Field. Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience 2018;24:208-217 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Chronostratigraphic chart for the Bekapai Field. Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience 2018;24:208-217 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Mudstone compaction trend (arrowed curve) on a sonic–density cross-plot based on results obtained by Dutta (2002) in the Gulf of Mexico. Mudstone compaction trend (arrowed curve) on a sonic–density cross-plot based on results obtained by Dutta (2002) in the Gulf of Mexico. The trend is followed by mudstones undergoing progressive burial and compaction without unloading. The lower and upper parallel straight lines are Dutta's (2002) early and late trends for smectite-rich and illite-rich mudstones, respectively. The fan of arrows indicates possible paths for a diagenetically altered mudstone to follow, ranging from ongoing diagenesis without unloading to unloading without compaction. Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience 2018;24:208-217 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Data from well W-B-1. Data from well W-B-1. (a) Cross-plot of natural gamma against for all data points below 2000 m. The box indicates selected mudstone data points. (b) Density log with smoothed log. (c) Sonic log corrected for clay content with smoothed log. (d) Pressure–depth plot with estimates of the maximum loading pore pressure and the total pore pressure. (e) Sonic–density cross-plot using the smoothed logs. Sticks mark depths in metres. The solid, parallel straight lines are Dutta's (2002) early and late trends for smectite-rich and illite-rich mudstones, only included here as reference lines. The dotted line is the late compaction trend picked for illite-rich mudstones at maximum vertical effective stress. Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience 2018;24:208-217 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

(a) Plot based on equation (4) to estimate and for the hydrostatically pressured mudstone data points in well W-B-1 over the depth range 2400 – 3500 m. (a) Plot based on equation (4) to estimate and for the hydrostatically pressured mudstone data points in well W-B-1 over the depth range 2400 – 3500 m. The gradient is , yielding for the assumed value of . The intercept is , yielding MPa. (b) Mudstone density data from well W-B-1 overlain by the density normal compaction trend for hydrostatic vertical effective stress, found from equation (1) with parameters determined from the plot in (a). Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience 2018;24:208-217 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Data from well B-11. Data from well B-11. (a) Cross-plot of natural gamma against for all data points below 2000 m. The box indicates selected mudstone data points. (b) Density log with smoothed log below 3491 m. The smooth density trend above 3491 m was calculated from equation (1) using the diagenesis function and assuming hydrostatic vertical effective stress. (c) Sonic log corrected for clay content, with smoothed log. (d) Pressure–depth plot with estimates of the maximum loading pore pressure and the total pore pressure. (e) Sonic–density cross-plot using the smoothed logs in (b) and (c). Sticks mark depths in metres. The solid, parallel straight lines are Dutta's (2002) early and late trends for smectite-rich and illite-rich mudstones, only included here as reference lines. The dotted line is the late compaction trend estimated for illite-rich mudstones at maximum vertical effective stress. Agus M. Ramdhan, and Neil R. Goulty Petroleum Geoscience 2018;24:208-217 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE