Porosity Development Controlled by Deep-Burial Diagenetic Process in Lacustrine Sandstones Deposited in a Back-Arc Basin (Makó Trough, Pannonian Basin, Hungary)

Figure 17

Reconstruction of fluid flows for the studied northeastern segment of the Makó Trough, which is located at the passive margin setting near the Pusztaföldvár High. This model is adapted and modified after Juhász et al. [109], which was previously proposed for a neighboring subbasin (Békés Basin). The schematic section is based on seismic profile (data compiled from Bada et al. [23] and Molnár et al. [110]). Sandy turbidite lobes are marked in yellow at the lower part of the Algyő Fm. Blue arrows indicate hydrologic connection between the basinal deposits and the fractured basement rocks. The thick brown arrow indicates the origin of sulphate-rich extraformational fluid, which was responsible for creating the open porosity in sandstones in the deep burial realm. Red arrows indicate the kerogen migration—according to the model by Szalay and Koncz [47], Magyar et al. [48], and Bada et al. [22]—from which the organic matter was preserved as streaks of residual bitumen in the upper turbidites (Algyő Fm).