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Geologic Features of Wangjiatun Deep Gas Reservoirs of Volcanic Rock in Songliao Basin

Global Geology 2001年第2期6卷 120-128页

作者： shan xuanlong (College of Earth Science, jilin University, Changchun, 130061, P.R.China) chen shumin (Daqing Petroleum Bureau Prospecting and Exploration Institute, Daqing, 163712, P.R.China) wu dawei and zang yudong (qianan oil product factory of ji College of Earth Science Jilin University Changchun 130061 P.R. China Daqing Petroleum Bureau Prospecting and Exploration Institute Daqing 163712 P. R China qianan oil product factory of jilin oil Field Songyuan 138001 P.R. China

Wangjiatun gas pool is located at the north part of Xujiaweizi in Songliao basin. Commercial gas flow has been found in the intermediate and acid volcanic rock of upper Jurassic-lower Cretaceous, which makes a breakthrough in deep nature gas prospecting in Songliao basin. The deep natural gas entrapment regularity is discussed in the paper by the study of deep strata, structure and reservoir. Andesite, rhyolite and little pyroclastic rock are the main reservoirs. There are two types of volcanic reservoir space assemblage in this area: the pore and fissure and the pure fissure. Changes had taken place for volcanic reservoir space during long geologic time, which was controlled by tectonic movement and geologic environment. The developed degree of reservoir space was controlled by tectonic movement, weathering and filtering, corrosion and Filling. There are three types of source-reservoir-caprock assemblage in this area: lower source- upper reservoir model, upper source-lower reservoir model and lateral change model. Mudstone in Dengluoku formation and the compacted volcanic rock of upper Jurassic-lower Cretaceous are the caprock for deep gas reservoirs. Dark mudstone of deep lacustrine facies in Shahezi formation and lower part of Dengluoku formation are the source rock of deep gas. It can be concluded that deep gas pools are mainly volcanic lithologic reservoirs.

关键词： Wangjiatun deep gas reservoirs, Volcanic rock, Upper Jurassic - lower Cretaceous, Songliao basin

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