Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 67-78.doi: 10.12108/yxyqc.20190607

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Thermal evolution history and prediction of favorable zones in Lunpola Basin

GENG Tao1, MAO Xiaoping1, WANG Haochen1, FAN Xiaojie1, WU Chonglong2   

  1. 1. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    2. College of Computer Science, China University of Geosciences(Wuhan), Wuhan 430074, China
  • Received:2019-05-29 Revised:2019-07-28 Online:2019-11-21 Published:2019-09-28

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Abstract: Lunpola Basin is the most oil-gas exploration potential basin found in Tibet,and has a broad prospect for exploration. In order to study the thermal evolution history of source rocks and the law of oil and gas migration and accumulation in this area,drilling core analysis,2-D seismic data interpretation,single well thermal evolution history modeling,simulation analysis of oil-gas migration and accumulation were carried out. The results show that:(1)Thick turbidite sand bodies were identified at the bottom of the lower submember of the third member of Niubao Formation in wells W1 and W2.(2)At the end of Eocene,affected by the double action of high heat flow and high geothermal gradient,the source rocks of the middle submember of the second member of the Niubao Formation began to generate hydrocarbons and the process has been continuing to this day. The maturation of source rocks tended to be early in the west and late in the east. During this period,a small amount of hydrocarbon mainly migrated in Jiangri Aco Sag and Jiangjiaco Sag,and accumulated in the uplift zone and its periphery in the sag.(3)In the early Oligocene,large-scale hydrocarbon migration took place in Pacuo Sag. Hydrocarbon migrated northward and southward along the dominant migration pathway and upward through faults. It is inferred that there are 10 favorable oil-gas accumulation zones in the middle part of the thrust nappe belt in the northern basin and in the middle and western part of the southern thrust uplift belt in the southern basin,as well as in the eastern part of Jiangjiacuo Sag and the western part of Pacuo Sag. The study results provide a basis for oil and gas exploration in Lunpola Basin.

Key words: sedimentary facies, thermal evolution history, oil-gas accumulation zone, Niubao Formation, Lunpola Basin

CLC Number: 

  • TE121
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