Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (2): 393-404.doi: 10.13278/j.cnki.jjuese.201702106

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Discussion of Secondary Dissolved Pore Origin in Near Source Sandy Conglomerate Reservoir: A Case Study of Xiang 6 Well Area in Chagan Depression

Liu Xinjin1,2, Feng Zhendong3, Li Cong4, Zhou Yan5, Wang Yaming5   

  1. 1. Research Institute of Exploration and Development, Shengli Oilfield, Sinopec Dongying 257015, Shandong, China;
    2. Postdoctoral Work Station of Shengli Oilfield, Sinopec, Dongying 257002, Shandong, China;
    3. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China;
    4. Jidong Oilfield, PetroChina, Tangshan 063004, Hebei, China;
    5. Research Institute of Exploration and Development, Zhongyuan Oilfield, Sinopec, Puyang 457001, Henan China
  • Received:2016-06-06 Online:2017-03-26 Published:2017-03-26
  • Supported by:
    Supported by National Science and Technology Major Project(2011ZX05006-004,2011ZX05040-005)

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Abstract: The honeycomb-like secondary dissolved pores are well developed in Xiang 6 well area in one side of Maoxi fault in Chagan depression. Based on thin sections, SEM, and casting thin sections data, the secondary pores formed mainly due to dissolution of anorthite particles and carbonate cement as well as some felsic rock debris and quartz granule. Fluorescence chip and inclusion temperature verified the existence of two stages of cementations. Combining with the evolution of reservoir, we found that the diagenetic evolution corresponded to two hydrocarbon generations and two uplift denudations. The key diagenetic evolution sequences is as follows, Compaction (the first deep burial)-dissolution of a great deal of feldspar particles, little quartz overgrowth and partly accumulation(the first hydrocarbon generation)-the first cementation(the first uplift denudation)-dissolution of the first cement, development of honeycomb-like secondary dissolved pores and partly accumulation(the second deep burial and the second hydrocarbon generation)-the second cementation and dissolution of some quartz particles.

Key words: Chagan depression, diagenesis, pore evolution, secondary pore, reservoir

CLC Number: 

  • P544.4
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