【摘要】 酒泉盆地中生代为拉张断陷盆地发展阶段,形成了一系列NNE向东断西超的早白垩世次级凹陷,表现为中国东部断陷湖盆的特征,具备形成构造—地层(岩性)油气藏的地质背景。以往的油气勘探主要针对构造油气藏,虽获得一些重大发现,但近年勘探效果并不理想。文中针对该区储层非均质性强、地震资料品质差的特点,充分利用钻井资料,采用地震属性分析、水平切片、倾角测井和成像测井、层序地层学等技术对青西、营尔两个凹陷的构造—地层油气藏进行了勘探、研究。通过精细的断块构造解释和沉积相、储层预测,发现了一批构造—地层圈闭,分别在青西凹陷、营尔凹陷优选出YX1、C3两口区域探井,经钻探均获商业油流,使酒泉盆地构造—地层油气藏勘探取得突破。更多还原

【Abstract】 The Mesozoic of Jiuquan basin was in developed stage of extensional fault basin,forming a series of NNE Early Cretaceous secondary sags characterized by fault in east and overlap in west and having the feature of east fault lake basin and geologic background of tectonic-stratigraphic (lithologic) reservoir.The targets of former oil/gas exploration were structural reservoirs,which was not ideal in recent exploration,although achieved some important results.In view of such technical difficulties as strong heterogeneity of reservoirs and poor quality of seismic data,the paper fully used drilling data and adopted such techniques as analysis of seismic attributes,horizontal slices,inclination logging and imaging logging,and sequence-stratigraphy in exploration and study of tectonic-stratigraphic reservoirs of two sags: Qingxi and Ying’er,which discovered a lot of tectonic-stratigraphic traps by fine interpretation of fault-block structures and prediction of sedimentary facies and reservoirs,where two regional prospecting wells,YX1 and C3,were optimally settled in Qingxi sag and Ying’er sag respectively and commercial oil flow was gained after drilling.The breakthrough has been made in tectonic-stratigraphic reservoir prospecting of Jiuquan basin.更多还原