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Implications for petroleum source-rock distributions in the Tarim Basin, NW China, derived from organic geochemical analyses



Implications for petroleum source-rock distributions in the Tarim Basin, NW China, derived from organic geochemical analyses



Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists 1998



Ordovician sourced oils mostly occur in wells on the Tazhong and southern Tabei uplifts. Biomarker characteristics of most samples from the Tazhong field indicate that their source rocks were probably deposited in a somewhat anoxic, carbonate marine setting, whereas southern Tabei samples are thought to be from somewhat anoxic, marine shales. These findings suggest that Ordovician sourced oils may be derived from a slope facies that occurred between the deep basinal portion of eastern Tarim and platformal deposits of western Tarim, rather than from the basinal graptolitic shales as had been widely speculated. Because the Tazhong area was structurally high during both the Ordovician and today, this model would explain why wells drilled to date in eastern Tarim have all been dry, as any oils generated from slope facies strata would migrate updip to Tazhong or the southern Tabei areas.

Accession: 019184498

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