Abstract

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Title:: Tracing and Identifying of Volcanic Bodies and Their Application on the Effective Exploitation of Gas Reservoir—Taking Volcanic Reservoir of the Member 1 of Yingcheng Formation in Xudong Area of Songliao Basin as an Example

Author(s):: CHEN Huan-qing; HU Yong-le; RAN Qi-quan; YAN Lin; Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

Keywords:: volcanic rock; favorable development area; stratigraphic correlation; reservoir; lithofacies; Yingcheng Formation; Xudong area; Songliao Basin

Abstract:: Volcanic reservoirs have the characteristics of strong anisotropism, large lateral variation, difficult effective prediction and exploitation. Taking the member 1 of Yingcheng Formation in Xudong area of Songliao Basin as an example, combined with the core, logging, seismic data and analytical test, the basic characteristics of volcanic bodies were described, and the application of tracing and identifying of volcanic bodies on the effective exploitation of gas reservoir was explained according to the detailed reservoir division, lithofacies classification and analysis of reservoir physical property, and prediction of favorable development area. The results show that the single volcanic body mainly extends to about 20 km², and the average thickness is mostly about 300 m; tracing and identifying of volcanic bodies, which are added into detailed correlation of volcanic reservoir, can solve the contradiction that the time radiuses of volcanic edifices are longer than those of volcanic bodies, and the stratum boundary passes through the former but not the latter; the relationship between volcanic bodies and lithofacies can forecast the development rules of different kinds of volcanic lithofacies or sub-lithofacies and favorable development areas; the high position near volcanic vent mainly develops favorable reservoir, and is the favorable development area.