Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 32-41.doi: 10.12108/yxyqc.20190404

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir-controlling effect of basement faults and favorable exploration zones in southwestern Qaidam Basin

NI Xianglong1,2, WANG Jiangong1,2, GUO Jiajia1,2, DU Binshan1, YI Dinghong1, LONG Guohui3, LI Zhiming1,2, HUI Yuanyuan1,2   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China;
    3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2019-03-19 Revised:2019-05-23 Online:2019-07-21 Published:2019-06-21

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Abstract: In recent years,great breakthroughs have been made in hydrocarbon exploration of basement rock in southwestern Qaidam Basin,and Kunbei reservoir has been found. In order to make clear the reservoir-controlling effect and accumulation model of basement faults,drilling core analysis,logging analysis and 3-D seismic data interpretation were carried out. The results show that:(1)Deep and large faults were well developed and they controlled the development of basement reservoir. The early activities of synsedimentary reverse faults No. Ⅺ and Ⅷ and Alar fault controlled the development of the three major hydrocarbon-generating sags. The deep and large faults in the basement were active during the key reservoir-forming periods,providing vertical migration channel for the initial hydrocarbon accumulation.(2)The paleo-uplift controlled by deep and large faults was an advantage area for oil and gas accumulation,and fracture and dissolved pores developed in weathering crust provided reservoir space for oil and gas accumulation.(3)Capping capacity of mudstone caprock overlying on weathering crust controlled oil and gas enrichment,and the late activity of deep and large faults may destroy the capping capacity.(4)An oil and gas accumulation model for basement reservoir with deep and large faults as the core was established,namely,deep and large faults adjacent to hydrocarbon-generating sags,paleotectonic setting and highquality mudstone caprock jointly controlled hydrocarbon enrichment and accumulation.(5)Zhaxi nose-shaped uplift,Wunan nose-shaped uplift and Q3 nose-shaped paleo-uplift in Yuejin slope located on the hanging wall of deep and large faults are favorable areas for the next exploration in this area. The study results have guiding significance for basement reservoir exploration in Qaidam Basin.

Key words: fault-controlled reservoir, basement fault, paleo-uplift, favorable exploration areas, basement reservoirs, southwestern Qaidam Basin

CLC Number: 

  • TE122.1
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