Geological Characteristics of Ordovician Buried Hill and Main Factors of Oil/Gas Accumulation in Nanpu Sag,Bohai Bay Basin,China
Received date: 2011-11-05
Revised date: 2011-12-27
Online published: 2012-02-10
Laopunan1 well,which recorded a prolific high oil flow of 700m3/d in an Ordovician buried hill in 2004,discovered the Nanpu oilfied in Nanpu sag,Huanghua sub-basin,Bohai Bay basin.In this paper we discusse the oil/gas geological features and the controlling factors of oil/gas accumulation in the Nanpu Ordovician buried hill based on core drilling,seismic and logging data.The results indicate that: (1) Main kind of reservoir in the Nanpu Ordovician buried hill is fracture fissure\|karstic composite reservoir,which is controlled by polycyclic tectonic movement and multiphase karstification;the reservoir spaces are mainly of crack,caverns and primary pores of cave filling sandstone and conglomerate deposition.(2) High quality source rock in the 4 sub\|member of Sha 3 member is the main source of oil and gas.(3) Oil/gas reservoir distribution is controlled by predominant reservoir;in the crisscross transport system the longitudinal and transverse net which is composed of the faults and unconformities is the pathway of oil and gas migration;the key factor of oil/gas accumulation is favorable configuration of effective source rocks and buried hill traps;the high zone of buried hill is beneficial for petroleum accumulation and the hydrocarbon can also be accumulated in the low position if the reservoir develops well.(4) Reservoir is the most important factor to control the oil and gas accumulation,so the main target of oil/gas exploration should be focused on the polycyclic tectonic -karstic controlled fracture fissure karst composite traps in the Nanpu Ordovician buried hill.
WANG Yong-Jun, ZHANG Bao-Min, WANG Zheng-Jun, WANG Xu-Dong . Geological Characteristics of Ordovician Buried Hill and Main Factors of Oil/Gas Accumulation in Nanpu Sag,Bohai Bay Basin,China[J]. Natural Gas Geoscience, 2012 , 23(1) : 51 -59 . DOI: 10.11764/j.issn.1672-1926.2012.01.51
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