杏北西斜坡区扶余油层成藏模式及主控因素

doi:10.11743/ogg20140505

Abstract

Abstract:

A slope zone is an important region for hydrocarbon migration and accumulation,thus has relatively high exploration potential.Through integration of seismic,well logging and oilfield production data,this paper studied the oil reservoir characteristics and important exploration targets in the Fuyu oil layer in the western slope zone of the northern Xingshugang oilfield,Songliao Basin.The results show that oil reservoirs in this area are developed under the joint control of fault and lithology,and the major oil reservoir types include fault-screened,fault block,fault-nose,fault anticline,updip lithologic pinch-out,and fault-lithologic reservoirs.These oil reservoirs are characterized by 'upper oil and lower water without unified oil-water contact’.Two hydrocarbon accumulation patterns are identified in the Fuyu oil layer,namely downward migration and accumulation within the source kitchen and lateral migration and accumulation beyond the source kitchen.The former refers to that,driven by the paleo-overpressure of the Qingshankou Formation,the oil sourced from the 1^st Member of Qingshankou Formation(K₂qn¹),migrated downward along the faults connecting the K₂qn¹ source rock and the underlying sand bodies and traps of the Fuyu oil layer,forming oil reservoirs.The latter means that the oil sourced from the K₂qn¹ source rock in the Qijia-Gulong depression first migrated downward to the Fuyu oil layer,and then migrated laterally into the northern Xingshugang region along pathways such as sand bodies and faults connecting the Qijia-Gulong depression and the northern Xingshugang region,forming oil reservoirs.The distribution of oil reservoirs are mainly controlled by available oil sources,match of faults and sand-bodies,and antithetic normal faults.The overpressure of the Qingshankou Formation is the key to ‘downward migration’ of oil,while abundant oil sources form the material basis and match of faults and sand-bodies provides pathways for ‘downward migration’ of oil.At last,it is suggested that the hanging walls of antithetic normal faults in good match with sandbodies are important targets for oil exploration.

Key words: oil-water distribution, hydrocarbon accumulation pattern, Fuyu oil layer, western slope of the northern Xingshugang oilfield, Songliao Basin

CLC Number:

TE122.3

Wang Yachun, Chen Chongguang, Wang Lu, Zhu Lin, Jiang Zheng, Xi Guoxing. Oil accumulation patterns and key controlling factors of Fuyu oil layer in the western slope of the northern Xingshugang oilfield, Songliao Basin[J]. Oil & Gas Geology, 2014, 35(5): 614-621.

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Oil accumulation patterns and key controlling factors of Fuyu oil layer in the western slope of the northern Xingshugang oilfield, Songliao Basin

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