Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (4): 932-946.doi: 10.13278/j.cnki.jjuese.20180264

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Characteristics and Genesis of Deep Carbonate Reservoirs in Shunbei Area

Wang Yuxiang1,2, Gu Yi2, Fu Qiang1, Wang Bin2, Wan Yanglu2, Li Yingtao3   

  1. 1. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China;
    2. Wuxi Research Institute of Petroleum Geology, Sinopec Petroleum Exploration & Production Research Institute, Wuxi 214126, Jiangsu, China;
    3. Exploration & Production Research Institute of Northwest Oilfield Company, SINOPEC, Urumqi 830011, China
  • Received:2018-10-17 Online:2019-07-26 Published:2019-07-26
  • Supported by:
    Supported by Project of Ministry of Science and Technology of China Petroleum & Chemical Corporation(P15115)

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Abstract: In order to clarify the reservoir characteristics and its genesis, the factors affecting the development of carbonate reservoirs in different fault zones at the north of Shunbei area were analyzed by means of core and thin section observation, X-ray diffraction, physical property test cathodoluminescence,and Sr isotope testing. The reservoir lithology is mainly composed of bioclastic micrite limestone, micrite sandstone limestone,and micrite limestone. The reservoir space types include caves, fractures, and holes. The main type fillings are calcite, organic asphalt, and siliceous quartz, among which calcite cementation is the most common and widely distributed with 2-3 times of cementation. The difference between the fillings of asphalt and siliceous is obvious in different reservoir spaces. The former fills only in the fracture system, while the latter fills almost entirely in the dissolution cavities. The reservoir body types of Yijianfang and Yingshan Formations are mainly of fracture type and fracture-hole type. The reservoir formation is mainly affected by fault-fracture system, fluid properties, source, and scale. Fault-fracture system directly controls the development of fractured reservoir, which can improve reservoir permeability and contribute to formation through providing a channel for fluid or oil and gas filling, and is a main controlling factor for reservoir development. Under the background of fracture passage, fluid transformation also has some influences on reservoir development. Among them, alkaline calcium-rich fluid has the greatest influence on reservoir development in the study area. The overall scale of acid silicon-rich and hydrocarbon-generating fluids is limited, so only partial reservoir modification is carried out.

Key words: reservoir genesis, reservoir characteristics, deep-buried carbonate rock, Lower-Middle Ordovician, Shunbei area

CLC Number: 

  • P618.13
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