Enrichment rules and exploration practices of Paleogene shale oil in Jiyang Depression, Bohai Bay Basin, China

SONG Mingshui,LIU Huimin,WANG Yong,LIU Yali

Table 3 Statistics on structural parameters of storage space in different lithofacies.

Lithofacies Reservoir space type Pore diameter/nm Average pore diameter/nm 2D pore throat coordination number Pore throat sorting Homogeneity Porosity/ % Organic rich lamellar argillaceous limestone/ limy mudstone Intercrystal pores in calcite 240-825 560 1.7-2.8 19 0.54 5-16 Micropores in clay minerals 11-489 270 1.5-1.8 22 0.26 Organic rich bedded argillaceous limestone/ limy mudstone Intercrystal pores in calcite 126-525 500 1.5-2.3 76 0.31 4-13 Micropores in clay minerals 7-328 75 1.2-1.9 28 0.25 Organic rich bulk limy mudstone/mudstone Intercrystal pores in calcite 68-210 158 0.5-0.9 115 0.29 3-8 Micropores in clay minerals 3-92 28 1.1-1.5 26 0.19