Differences in source kitchens for lacustrine in-source and out-of-source hydrocarbon accumulations

ZHAO Wenzhi,ZHANG Bin,WANG Xiaomei,WU Songtao,ZHANG Shuichang,LIU Wei,WANG Kun,ZHAO Xia

Table 1. Statistical table of geochemical characteristics of source rocks in different basins of China.

Basin Epoch Layer Distribution characteristics Organic geochemical characteristics Mineral composition Lithology Area/104km2 Thickness/m TOC/% (S1+S2)/(mg·g-1) Kerogen type Ro/% Clay mineral content/% Non-clay minerals content/% Ordos Triassic Chang-7 Member Mudstone and shale 5.0 10-70 1.0-14.0 6-60 Type II1 0.6-1.1 50-70 30-50 Junggar Permian Lucaogou Formation Mudstone and shale carbonate 0.3 100-240 2.0-9.0 2-45 Type I, some type II1 0.6-1.2 10-40 60-90 Fengcheng Formation Mudstone and shale 0.3 100-250 0.6-3.0 1-25 Type II-II1 0.6-1.3 15-40 60-85 Songliao Cretaceous Qingshankou Formation Mudstone and shale 2.0 40-150 0.9-5.0 5-26 Type I, some type II1 0.5-1.3 40-60 40-60 Nen Jiang Formation Mudstone and shale 1.5 50-150 2.0-11.0 5-50 Type I, some type II1 0.5-0.7 50-60 40-50 Bohai Bay Paleogene Kong-2 Member Mudstone and shale 1.5 50-200 2.0-10.0 2-25 Type I, some type II1 0.8-1.4 20-40 60-80 Sha-4 Member Mudstone and shale 2.0 100-250 1.5-4.5 4-28 Type I, some type II1 0.5-1.3 40-60 40-60 Qaidam Paleogene E32 Mudstone and marl 0.6 50-100 0.5-3.0 2-25 Type I, some type II1 0.6-1.0 20-40 60-80