Oil & Gas Geology ›› 2008, Vol. 29 ›› Issue (6): 748-757.doi: 10.11743/ogg20080607

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Lithofacies and reservoir quality control factors of volcanics in the Yingcheng Formation in the Shengping gas field in the Songliao Basin

Luo Jinglan1, Lin Tong1,2, Yang Zhisheng3, Liu Xiaohong1, Zhang Jun3, Liu Shuyun3   

  1. 1. State Key Laboratory of Continental Dyaamics, Northwest University, Xi'an, Shaanxi 710069, China;
    2. Langfang Branch, Research Institute of Petroleum Exploration and Development, PetroChina, Langfang, Hubei 065007, China;
    3. Cas Prnrlnction Rranch Company of Daqing Oil Field Company Ltd., PetroChina, Daqing, Heilongjiang 163000, China
  • Received:2008-11-10 Online:2008-12-24 Published:2012-01-16

Abstract:

Study on lithology and petrography of volcanics and mechanism of volcanic activities in the Lower Cre-taceous Yingcheng Formation of the Shengping gas field in the Songliao Basin,indicates that rock types are mainly pyroclastics and lava,with minor pyroclastic lavas,sedimentary pyroclastic rocks,pyroclastic sedimentary rocks and sub-volcanic rocks.Lavas are dominated by rhyolite with minor dacite.Four volcanic eruption-effusion cycles can be recognized in the third member,the major gas-bearing interval,of Yingcheng Formation.The vol-canic activities are characterized by alternation of relatively quiet fissure effusion with relatively strong central eruption that features in high frequency,rapid eruptions,short intermittence,and quick condensation and consoli-dation.Five lithofacies (explosive,effusive,extrusive,volcanic conduit and volcanic-sedimentary facies)and six sub-facies(splash fall lava,pyroclastic,lava flow,volcanic gravity flow,volcanic neck and sub-volcanic) can be recognized.Wells with high gas flow rate are mainly located in areas with the volcanic explosive facies or interbe-ded explosive facies and effusive facies.The volcanic reservoir quality is mainly controlled by lithology,lithofa-cies,thickness and spatial distribution of volcanic rocks,followed by the characteristics of volcanic activity,pa-leogeomorphology,diagenesis and tectonic action.

Key words: mechanism of volcanic activity, lithofacies and reservoir quality, petrography, volcanic rock of the Yingcheng Formation, Shengping gas field, Songliao Basin

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