华南地质2023，Vol.39Issue(4)：630-642,13.DOI:10.3969/j.issn.2097-0013.2023.04.004
湘中涟源凹陷泥盆系佘田桥组海相致密泥灰岩气藏特征
Characteristics of Devonian Marine Tight Marl Gas Reservoir in Lianyuan Sag
摘要
Abstract
Recently,industrial gas flow has been obtained from the XXY1 well in the pilot gas test of the De-vonian marine tight marl,and an important discovery has been made for oil and gas exploration in central Hu-nan of the Yangtze region.In order to reveal the basic reservoir-forming characteristics of this type of gas res-ervoir,this study is based on stratigraphic division and correlation,rock and mineral composition,source rock evaluation,gas-bearing analysis and comparison with marl oil and gas reservoirs at home and abroad,the for-mation conditions of Devonian marine tight marl gas reservoirs in the Lianyuan Sag are deeply dissected,which provides an important basis for oil and gas resource exploration and potential evaluation in the central part of Hunan Province.The results show that the segmented characteristics of the Shetianqiao Formation De-vonian in the Lianyuan Sag of central Hunan are obvious,with stable stratigraphic thickness and strong com-parability.The gas bearing layer is concentrated in the lower mudstone section,the thickness of which is more than 150 m.The main mineral composition of Marl is carbonate mineral,and the average brittle mineral content is 79.4％,which is favorable for fracture formation in the later stage of fracturing.The organic matter type of the marl is mainly Ⅱ1 and Ⅱ2,and the maturity of the organic matter is in the over-mature stage.In the core,there are mainly middle and high angle cracks with relatively less low angle cracks among the tectonic cracks.Full gas log hydrocarbon curve and no obvious vertical gas-water differentiation are typical character-istics of tight gas reservoir.Compared with the Shahejie Formation in Bohai Bay Basin and Yingtan Forma-tion in Gulf of Mexico Basin,the Devonian marl gas reservoir in Lianyuan Sag has the characteristics of shal-low burial,large thickness and good geological features,which show good exploration and development po-tential.关键词
致密泥灰岩/气藏特征/佘田桥组/泥盆系/涟源凹陷/湘中地区Key words
tight marl/gas reservoir characteristics/Shetianqiao Formation/Devonian/Lianyuan Sag/Cen-tral Hunan region分类
地质学引用本文复制引用
吕嵘,张保民,苗凤彬,张国涛,周鹏,王强..湘中涟源凹陷泥盆系佘田桥组海相致密泥灰岩气藏特征[J].华南地质,2023,39(4):630-642,13.基金项目
中国地质调查局地质调查项目(DD20190109、DD20221659) （DD20190109、DD20221659）
