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Multi-Unconformity Stage and Its Oil-Gas Geological Significance in Yanji Basin

Zhang Jiguang1,Qiao Dewu2, Jin Yinji3,Liu Yanjie3,Deng Chuanwei3, Cong Peihong3,Zhang Donghua1   

  1. 1.Exploration Company of Daqing Oilfield Limited Company, Daqing163453,Heilongjiang,China;
    2.Strategic Research Center of Oil & Gas Resources, Ministry of Land and Resources, Beijing100034, China;
    3.No.1 Geophysical Exploration Company of Daqing Drilling & Exploration Corporation, Daqing163357, Heilongjiang, China
  • Received:2012-12-10 Online:2013-11-26 Published:2013-11-26

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Abstract:

Yanji Basin is a rift basin with strong rework. Six regional unconformities which are mainly angular unconformity and overlap unconformity were identified by seismic, geological and logging data. The prototype of basin was formed by the stage Ⅰ, Ⅱof Yanshanian and the inversion stage of the basin was the stage of Ⅳ of Yanshanian. During this period，the abundant kaolinite (40%) are related to the meteoric water eluviation. After temporary subsidence stage, N-S compression during the stage Ⅴ of Yanshanian made this area suffer strong denudation. This compression led to a large height of uplift in north and south. The erosion thickness in north and south is more than 700 m while it is about 300 m in the center of the basin. The division of three tectonic sequences is based on the unconformity. The conformity between Tongfosi and Dalazi Formations is preferential for hydrocarbon generation during the Early Cretaceous. It can not only improve the permeability of reservoir but also supply the pathways of petroleum secondary migration. The oil/gas reservoirs（eroding monadnock, overlap unconformity, slope break area of fault) related to the unconformity are the favorable exploration target in future.

Key words: Yanji basin, multi-stage unconformity, structural stage, oil and gas

CLC Number: 

  • P618.13
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