Petroleum origin and accumulation in the rift basin: a case study from the Nanpu sag, Bohai Bay basin, China

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ORIGINAL PAPER

Petroleum origin and accumulation in the rift basin: a case study from the Nanpu sag, Bohai Bay basin, China Lixin Pei 1 & Wenzhe Gang 1 & Gang Gao 1 & Yuexia Dong 2 & Zhilong Huang 1

Received: 11 August 2015 / Accepted: 18 November 2015 / Published online: 10 March 2016 # Saudi Society for Geosciences 2016

Abstract The origin of oil reservoirs in four structural belts in the Nanpu sag, Bohai Bay basin, was studied on the basis of the results of Rock-Eval pyrolysis on 140 samples and biomarker analysis on 30 source rock samples and 43 oil samples. The three possible source rock intervals have different biomarker associations and were deposited in different environments. The third member of the Shahejie Formation (Es3) is characterized by relatively high gammacerane/αβ C30 hopane (>0.09), high extended tricyclic terpane ratio (ETR) ([C28 + C29]/[C28 + C29 + Ts]) (>0.4)), low C27 diasterane/sterane (

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