Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (1): 34-47.doi: 10.13278/j.cnki.jjuese.201701104

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Characteristics of Main Ordovician Reservoir Rocks in Block Two of Tahe Oilfield

Fan Zhuoying, Lin Chengyan, Ju Chuanxue, Han Changcheng, Xiong Chenwei   

  1. College of Geosciences in China University of Petroleum. Qingdao 266580, Shandong, China
  • Received:2016-04-05 Online:2017-01-26 Published:2017-01-26
  • Supported by:
    Supported by National Natural Science Foundation (41404086), National Science and Technology Major Project(2011ZX05020-008), National Natural Science Foundation of Shandong Province(ZR2014DQ007) and National Science and Technology Major Project of CNPC (2012E-34-12)

Abstract: The main types of Ordovician carbonate reservoirs consist of fracture-cavity type, high energy pore type, and pore-fracture type by pressure solution in block two of Tahe oilfield. Based on core, thin section, seismic, well logging, and well test data, we analyzed characteristics and distribution of each type of reservoir. There are 10 types of reservoir spaces, including dissolved pore, eroded fracture, tectonic fracture, inter particle pore, intra particle pore, moldic pore, intercrystal pore, stylolite, and micro-fracture in carbonate reservoirs. In fact, these reservoirs are all evolved from grainstones formed in high energy sedimentary belts. Grainstones evolved into secondary micro-pore dominating reservoirs by compaction and cementation, and they also formed pressolution pore-fracture reservoirs by pressolution and dolomitization, which developed dissolved fracture-cavity reservoirs. Affected by distribution of sediment facies and diagenesis, it develop grainstone and cloudy limestone in the south. Due to strong weathering and denudation in the north, it formed reservoirs with large dissolution cavities. With developing of ancient rivers at eastern slope, dissolution pores and cavities developed along the ancient river. Controlled by deep faults in the west, dissolution pores and cavities vertically developed along the fracture.

Key words: carbonate, reservoir, Tahe oilfield, Ordovician

CLC Number: 

  • P618.13
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