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 4 Criteria for selecting prospective area of terrestrial shale oil in the Jiyang Depression.

Type Lithofacies Depth/ m TOC/ % S1/ (mg?g-1) Ro/ % Gas logging/% Interlayer type Fracture type Pressure coeffi- cient Oil density/ (g?cm-3) Brittle mineral content/% Matrix Organic rich lamellar >3 400 >2 >2 >0.9 >80 Shrinkage joint, grain edged, shale-bedding, abnormal pressure, and dissolution fractures >1.4 <0.866 1 >60 Inter- layer Organic rich lamellar, bedded >3 000 >2 >2 >0.7 >80 Carbonate interlayer, sandstone interlayer Shale-bedding, dissolution, abnormal pressure fractures >1.2 <0.890 0 >50 Frac- ture Organic rich lamellar, bedded >3 000 >2 >2 >0.7 >80 Shale-bedding, dissolution, abnormal pressure, tectonic fractures >1.2 <0.890 0 >50