Reservoir Evaluation and Development ›› 2022, Vol. 12 ›› Issue (1): 1-9.doi: 10.13809/j.cnki.cn32-1825/te.2022.01.001

• Specialist Forum •     Next Articles

Characteristics of geological section of Well-GY8HC in Gulong Sag, Northern Songliao Basin

HE Wenyuan1,2,3(),FENG Zihui2,3,ZHANG Jinyou2,3,BAI Yunfeng2,3(),FU Xiuli2,3,ZHAO Ying2,3,CHENG Xinyang2,3,GAO Bo2,3,LIU Chang4   

  1. 1. Daqing Oilfield Co., Ltd., CNPC, Daqing, Heilongjiang 163002, China
    2. Exploration and Development Research Institute of Daqing Oilfield Co., Ltd., CNPC, Daqing, Heilongjiang 163712, China
    3. Heilongjiang Provincial Key Laboratory of Continental Shale Oil, Daqing, Heilongjiang 163712, China
    4. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
  • Received:2021-12-10 Online:2022-02-26 Published:2022-03-24
  • Contact: BAI Yunfeng E-mail:hewy@cnpc.com.cn;byf198407@163.com

Abstract:

In order to study the lithology, property and brittleness of Gulong shale reservoir, a whole-section coring well, Well-GY8HC, is deployed in Gulong Sag. Detailed core description and element analysis show that the sedimentary microfacies in Gulong Sag are mainly semi-deep to deep lacustrine facies during the sedimentary period of Q1 to Q9 reservoirs, with thick organic-rich shale developed and can be subdivided into four types of lithology which are shale, siltstone, shell limestone and dolomite. Based on the classification principle of “structure+lithology” and combined with the lithology content characteristics, the lithofacies are divided into four types which are laminated shale, intercalated shale, massive dolomite and massive siltstone. The paleo-sedimentary environment is fresh water-brackish water+weak provenance+strong reduction in warm and humid climate, providing favorable place for organic matter formation and preservation. Comprehensive evaluation of three indexes of reservoir capacity, oil-bearing property and fracability shows that several reservoir space types of Q1 to Q3 reservoirs with good physical property, excellent oil bearing property and efficient fracability for shale oil production, being the most favorable interval for medium and high mature shale oil exploration in Daqing Oilfield.

Key words: geological section, sedimentary facies, Well-GY8HC, Gulong Sag, Sichuan Basin

CLC Number: 

  • TE122