Oil & Gas Geology ›› 2019, Vol. 40 ›› Issue (1): 1-11.doi: 10.11743/ogg20190101

• Petroleum Geology • Previous Articles     Next Articles

Dynamic characteristics and model of hydrocarbon accumulation in the large Chunxiao oil and gas field in the East China Sea Shelf Basin

Xu Hong1,2,3, Zhang Weiwei1,3,4, Ji Zhaopeng1,5,6, Wang Li7, Wang Qing2,8, Su Dapeng1,3, Lei Baohua1,3, Yang Yanqiu1,3   

  1. 1. Qingdao Institute of Marine Geology, China Geological Survey, Qingdao, Shandong 266071, China;
    2. Key Laboratory of Marine Sedimentology & Environmental Geology(State Oceanic Administration, The First Institute of Oceanography, Soa, Qingdao, Shandong 266061, China;
    3. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China;
    4. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
    5. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;
    6. Laboratory of Sediment Mineralization and SedimentMineral, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;
    7. Research Institute of Exploration and Development of XinJiang Oilfield Branch, PetroChina, Karamay, Xinjiang 834000, China;
    8. Yangtze University, Wuhan, Hubei 430100, China
  • Received:2018-09-13 Revised:2018-09-25 Online:2019-02-28 Published:2018-12-08

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Abstract:

The research on the dynamics of hydrocarbon accumulation is a frontier of kinetics research.The study on the dynamics of hydrocarbon accumulation in the large Chunxiao oil and gas field is also a hot topic,but a bottleneck as well,in the study of hydrocarbon accumulation features in the East China Sea Shelf Basin for a long time.Through well-to-seismic tie interpretation and numerical simulation,we concluded three energy fields supporting the accumulation in the oil and gas field,including temperature field,pressure field and stress field, the dynamic elements of which were analyzed as well.It's pointed out that the study area is characterized by high geothermal gradient,up to 36~40℃/km,and 60 magmatic intrusive rocks are found therein,leading to the promotion of hydrocarbon accumulation by locally increasing temperature.The thermal maturity of source rocks is significantly inconsistent.The results of numerical simulation show that the maturity is high in degreein northeast and southeast of large Chunxiao area;the Tianwaitian and Chunxiao-Duanqiao structures come to the last in terms of the maturity of their source rocks,and the large Chunxiao structure is also late in this aspect;the NNE-trending tension stress field in the early and middle stages produces tensile normal faults,which are conducive to hydrocarbon migration and preservation.In the later period,the NWW-trending tension-shear stress field forms translational faults,which are also favorable for hydrocarbon preservation.Typical overpressure is developed and a large overpressure sac exists in the area,and an overpressure-pressure sac model is proposed to demonstrate the effect of overpressure and fracture systems on promoting hydrocarbon migration.In addition,the numerical simulation method is used to reveal the era,process and results of hydrocarbon migration.The key moment and events,and dynamic mechanism and process of hydrocarbon accumulation in the study area are integratedly analyzed,leading to the establishment of the dynamic model of hydrocarbon accumulation in large Chunxiao oil and gas field as well as its accumulation model.

Key words: accumulation model, dynamic model of hydrocarbon accumulation, petroleum system event, large Chunxiao oil and gas field, East China Sea Shelf Basin

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