【摘要】 志留系柯坪塔格是两北地区重要的含油气层系,但沉积相认识不足制约着该区的勘探步伐。在岩石学特征研究基础上,认为此地区志留系柯坪塔格组主要为岩屑石英砂岩。结合沉积构造背景、岩心、测井和地震等资料的综合分析,应用孔渗资料评价,认为中-下临滨和涨潮三角洲砂体总体物性相对较好,形成了本区主要储集砂体的有利相带。更多还原

【Abstract】 The Silurian formation is one of the important gas and oil enrichment conditions in the Tarim basin,however,the research on sedimentary facies still hasn′ t been clearly undersood,which seriously prevents the advances of oil and gas exploration.According to detail study on petrology character and lamella observation,the Silurian kepingtage formation mainly is lithic quartz sandstone with perfect sorting and mineral grains present round-hypo-round,generally having high compositional maturity and textural maturity.Based on comprehensively analysis of sedimentary tectonic background,coring data,well logging and seismic data,it is concluded that research area major develops a seashore environment with barriers,with a feature by barrier land lagoon shoreface foreshore,depositing several types of sandbody.By use of porosity and permeability data,the result indicattes that mid-low shore sandbody and flood tidal detal sandbody with relatively gond physical property can be as the favorable facies for forming the main reservoir body;while barrier bar sandbody and washover fan sandbody with so low permeability have little possibility to store oil.更多还原