二连盆地断陷模型研究及其在新区评价中的应用

二连盆地是在海面褶皱基底上发育起来的中新生代断陷湖盆群，共发育大小不等的５０个凹陷。本项研究工作旨在通过对已出油凹陷构造模型的研究，指导新区勘探。研究中，从已出油的老凹陷出发，以断陷结构、构造发育、构造样式和构造环境为依据，划分了四种构造模型，研究了各类断陷的石油地质和油气聚集特点，指出，双断地堑式凹陷对油气聚集最为有利，单断断槽式凹陷次之，而单断断超式和单断反转式凹陷油气聚集条件较差。并指出断陷构造模型研究在新区勘探的凹陷评价优选和定凹选带方面的应用。特别地将断陷构造模型的研究成果与中国石油天然气总公司的“盆地（凹陷）排队优选标准”相结合，对二连盆地新区凹陷进行了优选评价，直接指导了二连探区的勘探部署。

The Study of the Structure Models of the Sags in Erlian Basin and Its Application in the Evaluation of Undeveloped Sags

Erlian Basin,a cluster of rift lake basins in the Mesozoic and Cenozoic eras developed on the base of the Hercynian fold belt,consists of 50 sags in different scale.The study aims at guiding the exploration of the undeveloped sags by the research of the structure models of the oil producing ones.Four structure models are derived from the analysis of the texture,structural type,structural development and structural environment,and the features of the petroleum geology and the oil gas accumulation of the sags are also studied in this paper.The result shows clearly that the best sags for oil gas accumulation are graben ones with faults in both sides;the better are fault trough ones with fault in one side;the poor are fault overlap and reverse ones with fault in one side.The application of the four models is introduced in evaluating the undeveloped sags and selecting the best structure belts.Especially being integrated with“The Standard of Basins Arrangement”from China National Petroleum Corporation,the result of the study is used in the evaluation of the undeveloped sags in erlian basin,and the evaluation directly guides the exploration plan.