Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 117-124.doi: 10.3969/j.issn.1673-8926.2017.02.014

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Formation mechanism of deep high-quality reservoirs of Yingcheng Formation in Longfengshan area,Songliao Basin

LIU Xixiang1,2, ZHANG Shaonan1,2, YANG Peng3, ZHANG Yongmei1, HE Hao4   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Research Institute of Exploration and Development, Sinopec Southwest Oil & Gas Company, Chendu 610041, China;
    4. No. 2 Oil Production Plant, PetroChina Changqing Oilfield Company, Xifeng 745600, Gansu, China
  • Received:2016-08-09 Revised:2016-09-02 Online:2017-03-21 Published:2017-03-21

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Abstract: With the new exploration development of Longfengshan area in Changling graben,it is proved that the Yingcheng Formation with burial deeper than 3 000 m has favorable gas exploration potential. Although commercial oil and gas flow was produced in several wells,the formation mechanism and controlling factors for high-quality reservoirs remained undefined. Based on the data of core observation,casting thin sections,computed tomography(CT)scanning,physical properties testing and constant-rate mercury penetration,the formation mechanism and controlling factors for high-quality reservoirs were analyzed. The results show that the reservoir property in the study area is mainly controlled by diagenesis. According to this,the reservoirs were divided into compacted tight sandstone,chlorite-cemented sandstone and laumontite-cemented sandstone. The distribution of cementation and dissolution shows the characteristics of obvious zonation under the control of fresh water filling and lake water. The distribution model of various types of sandstones was established. During the middle diagenetic stage,the laumontite was dissolved by organic acids produced by source rock,and formed high-quality reservoirs in outer skirt of the fan delta front,which is the “sweet point” for the further hydrocarbon exploration.

CLC Number: 

  • TE122.2
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