北部湾盆地迈陈凹陷区域探井数模分析与油气勘探方向

doi:10.11743/ogg20170113

Abstract

Abstract:

Based on the petroleum-geological data of the Y1 well that is located in the southwestern margin of Maichen Sag of the Beibuwan Basin,in this study,the petroleum-geological and geochemical numerical simulation has been conducted using the PetroMod software.The results show that only the dark mudstones in the second section of Eocene Liushagang Group meet the standard of sufficient organic matter abundance to be defined as hydrocarbon source rock,but they have not reached the hydrocarbon generation threshold because of their low maturity.In addition,the geothermal field of the Maichen depression is generally low,and the mature hydrocarbon generation threshold depth,by comprehensive judgment,has been determined as 2 600 m,which is obviously deeper than that of Eocene hydrocarbon source rocks of the Weixinan and Wushi Sags.As Y1 well is out of drainage range of effective hydrocarbon generation,its structure may not have received sufficient hydrocarbon charge,to become a hydrocarbon accumulation in local structures and trap.Thus,this should result in an empty trap where the Y1 well is targeted.Therefore,favorable zones and traps within the effective hydrocarbon drainage zone of Eocene hydrocarbon source rocks should be focused on,in order to achieve a breakthrough of the commercial hydrocarbon exploration.

Key words: numerical simulation of basins, thermal evolution history of hydrocarbon generation, mature hydrocarbon generation threshold, hydrocarbon drainage system, Maichen Sag, Beibuwan Basin

CLC Number:

TE122.1

Zhang Wei, He Jiaxiong, Hu Yang, Liu Ju, Li Xiaotang. Numerical simulation research on a regional outpost well and its hint on the future hydrocarbon exploration direction of the Maichen Sag, Beibuwan Basin[J]. Oil & Gas Geology, 2017, 38(1): 121-131.

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Numerical simulation research on a regional outpost well and its hint on the future hydrocarbon exploration direction of the Maichen Sag, Beibuwan Basin

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