X. M. Xiao+*, Z. L. Hu* , Y B. Jin* and Z. G. Song*
*State Key Laboratory of Organic Geochemistry, Guangzhou
Institute of Geochemistry,
+author for correspondence: email email@example.com
In this paper we report on source rocks and maturation history
at the Lunnan oilfield, northern
The Lunnan field is located on a small-scale palaeo uplift which developed during the Early Palaeozoic. Hydrocarbons migrated updip from source areas in surrounding palaeo-lows along faults and unconformities. Major phases of hydrocarbon generation and migration occurred in the Early Silurian – Late Devonian, Cretaceous – Early Tertiary and Late Tertiary. Uplift and intense erosion at the end of the Devonian destroyed Early Palaeozoic oil and gas accumulations sourced from the Cambrian source rocks, but hydrocarbons generated by Middle and Upper Ordovician source rocks during the Mesozoic and Tertiary have been preserved. At the present day, accumulations are characterized by a range of crude oil compositions because source rocks from different source areas with different maturation histories are involved.
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