Heterogeneous geological conditions and differential enrichment of medium and high maturity continental shale oil in China

HU Suyun,BAI Bin,TAO Shizhen,BIAN Congsheng,ZHANG Tianshu,CHEN Yanyan,LIANG Xiaowei,WANG Lan,ZHU Rukai,JIA Jinhua,PAN Zhejun,LI Siyang,LIU Yuxi

Table 3. Characteristics of continental shale oil reservoirs in China

Basin type Lithology Lithologic subtype Sedimentary facies belt Permeability/ 10-3 μm2 Porosity/ % Example Lake basin mainly with terrigenous source material Sandstone Feldspathic siltstone, lithic arkose, feldspathic lithic siltstone, and argillaceous siltstone Delta front underwater distributary channel, gravity flow, etc. and front delta <0.3 3-13 Chang-71 Sub-member and Chang-72 Sub- member in Ordos Basin Shale Clayey shale and felsic shale, and mudstone Semi deep - deep lake <1 2-15 Chang-73 Sub-member in Ordos Basin, Qing-1 Member in Songliao Basin Lake basin mainly with authigenic deposit (including volcanic source) Diamictite Dolomitic silt-fine sandstone, dolomitic sandstone, dolarenite, microcrystalline-micritic dolomite, dolomitic mudstone Semi deep lake, delta front 0.01-10.00 4-14 Lucaogou Formation in Junggar Basin and Santanghu Basin Carbonate Argillaceous dolomite, dolomitic shale, felsic shale Semi deep - deep lake 0.03-16.00 1-13 Kong-2 Member in Cangdong Sag, Bohai Bay Basin