准噶尔盆地不整合类型和分布规律

针对传统不整合类型划分主要根据不整合面两侧地层的几何关系或者反射终端模式或者不整合面的成因机制（构造与沉积）、地震反射终止方式及剖面形态对不整合进行分类，所存在的无法很好处理不整合与油气成藏关系的不足，借鉴传统的关于不整合面两侧地层几何关系的基本原理、采用地震地层学中对一个层序识别反射终端的定义，结合准噶尔盆地不整合面的特征，首次将准噶尔盆地不整合划分为四种类型：上超/削蚀型、上超/整一型、整一/削蚀型、整一/整一型。指出地势的高低与剥蚀量的大小决定了不整合类型在平面上的分布规律。其中上超/削蚀型和整一/削蚀型对油气聚集最有利。

THE UNCONFORMITY TYPE AND THE DISTRIBUTION LAW IN ZHUNGEER BASIN

The tranditional method of dividing unconformity types is to clasify the unconformity type on the basis of the geometrical relation of two sides of the unconformity plane or the reflection end pattern of the formation, or the unconformity formig mechanism of sedimentation and tectonic, and the mode of seismic reflection end and the morphology of cross section, but the tranditional method cann′t display the relation of the unconformity and oilgas migrationaccumulation. In this paper, on the basis of the tranditional principles on geometrical relation of two sides of the unconformity plane, by the definition of reflection end of sequence identification and the unconformity characteristics in Zhungaer Basin, the unconformity type is at the first time divided into onlap/erosional truncation type, onlap/concordance type, concordance/erosional truncation type, concordance/concordance type. The distribution law of unconformity type is decided by the sea level elevation and denudation. The onlap/erosional truncation type and concordance/erosional truncation type are of all favorableness for the accumulation of oil and gas.