摘要
2004年5月在渤海湾盆地沾化凹陷孤北斜坡带上的孤北古1井在上古生界获得了高产工业气流,对深层煤成气勘探取得了突破性进展。文中介绍了近年来,在该区上古生界煤成气藏勘探的成果,分析了天然气的成因及来源为石炭—二叠系含煤层系。在新生代随埋深加大,进入二次生气门限而生成煤成气,碳同位素分析和轻烃组分分析结果都证明,其为煤层气成因;气藏为自生自储型的受岩性控制的构造岩性气藏或岩性气藏。试气资料表明:渤海湾盆地深层上古生界煤成气具有良好的勘探前景。
High commercial gas production was obtained from the UpperPaleozoic reservoir of Gubeigu Well 1 that lies at Gubei slope belt of Zhanhua sag of Bohai Bay Basin in May,2004,which got breakthrough for deep coal-bed gas exploration.The article introduces exploration results for upper-Paleozoic coal-formed gas reservoir in the area for recent years.And the gas genesis is analyzed.The gas source comes from Carboniferous-Permian coal-bearing formations that were buried deeper and deeper at Cenozoic,and entered the secondary gas generation threshold to produce coal-formed gas.The results with both the carbon isotope analysis and the light-hydrocarbon component analysis prove the gas reservoir comes from coal-bed gas.The gas reservoir belongs to structural and lithological reservoir or lithological reservoir with itself generation and accumulation,which is controlled by lithology.The data from gas production test show there are good exploration prospects in Bohai Bay Basin for deep upper-Paleozoic coal-formed gas.
出处
《天然气勘探与开发》
2005年第4期20-23,共4页
Natural Gas Exploration and Development
