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哈萨克斯坦南图尔盖盆地的隐蔽油气藏日益成为勘探重点,如何借助层序地层学原理去寻找储集物性好的隐蔽圈闭成为油气勘探的难点。根据经典层序地层学原理,应用测井资料小波分析技术,结合岩性、测井曲线和地震反射等层序界面识别标志,对南图尔盖盆地上侏罗统和下白垩统进行了层序划分,共划分为4个三级层序、10个体系域。根据构造演化阶段的不同,划分出断拗转换期和拗陷期2种层序地层模式,前者主要发育滨浅湖和三角洲沉积,后者发育河流相沉积。其中断拗转换期层序地层模式中主要发育三角洲地层尖灭油气藏和滩坝透镜体油气藏,拗陷期层序地层模式中发育下切河道油气藏和河道透镜体油气藏。
Subtle reservoirs in the southern Turgai Basin of Kazakhstan are increasingly becoming exploration priorities. How to find hidden traps with good reservoir properties by means of sequence stratigraphy has become a challenge for oil and gas exploration. According to the principle of the classic sequence stratigraphy, using the logging data wavelet analysis technology, combined with the identification of sequence interfaces such as lithology, well logging and seismic reflection, the Upper Jurassic and Lower Cretaceous strata in the South Tureg basin are stratified Divided into a total of four three-level sequence, 10 system domain. According to the different stages of tectonic evolution, two kinds of sequence stratigraphic patterns, including fault dephasing transition period and depression stage, are divided. The former mainly develops shallow-lying lakes and delta deposits, while the latter develops river facies sediments. In the sequence stratigraphic mode of the fault-depression transitional period, the main developed deltaic stratigraphic pinch out reservoirs and dam-bank lens reservoirs are developed, and the down-cut channel reservoirs and channel lens reservoirs are developed in the sequence depression stratigraphic sequence model.