Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (2): 117-123.doi: 10.3969/j.issn.1673-8926.2012.02.023

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Heterogeneity of sandy conglomerate reservoir and its influence on remaining oil distribution: A case study from Badaowan Formation in the mid-west of block Ⅱ in Karamay Oilfield

HE Hui1, SONG Xinmin1, JIANG Youwei1, PENG Shimi2, LI Yanlan1, SUN Jingmin1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China; 2. Faculty of Natural Resource & Information Technology, China University of Petroleum, Beijing 102249, China
  • Online:2012-04-20 Published:2012-04-20

Abstract:

At present, the voidage-injection imbalance, interlayer interference and in-layer interference leaded by the reservoir heterogeneity are extremely highlighted during the production tail of sandy conglomerate reservoir in the midfan of alluvial fan. Taking the Jurassic Badaowan Formation in mid-west of the block II in Karamay Oilfield as an example, this paper studied the reservoir heterogeneity of alluvial fan sandy conglomerate reservoir. Based on outcrop observation, core description, electrofacies analysis, the single sand body description technique was used to divide the reservoir into 4 types of microfacies-lithofacies single sand body. Combining with the macroscopic and microscopic heterogeneity in different single sand body, the remaining oil were divided into 3 enriched types: Ⅰ-type braided channel gritstone facies, which has mesopore and small throat texture; Ⅱ-type braided channel fine sandstone facies, which has small pore and small throat texture; Ⅲ-type braided channel sandy conglomerate facies, which has small pore and fine throat texture. It is concluded that the type Ⅲ has the best water flooding effect and should be the main object of stabilizing oil production and controllingwater cut, and the type I and Ⅱ , where the properties are relativelyworse and the heterogeneity is stronger, should be the next potential target. Using this method of “recognizing the reservoir heterogeneity and resolving it” as the breakthrough point to analyze the single sand body and the heterogeneity, which can provide better reference for forecasting the distribution of remaining oil in the sandy conglomerate reservoir.

Key words: diagenesis, pore evolution, reservoir characteristics, Dongying Formation, L oilfield in Bohai Bay

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