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ORGANIC PETROLOGY OF POTENTIAL SOURCE ROCKS IN THE TARIM BASIN, NW CHINA

Potential source rocks in the Tarim Basin (NW China) include Cambrian‐Lower Ordovician lagoonal carbonates and mudstones; Middle‐Upper Ordovician platform carbonates; Carboniferous‐Permian shallow‐marine carbonates and mudstones; and Triassic‐Jurassic continental deposits including coals and lacustrine mudstones. Our petrological observations show that the organic components in Cambrian‐Ordovician deposits are mainly alginites andamorphinites with minor vitrinite‐like macerals, zooclasts and solid bitumen (Type I organic matter). The organic carbon content of these rocks is 0.1–2% TOC (averaging 0.9%TOC in deeper‐water fades) and they are mature to overmature in terms of oil generation.