塔中地区古生界层序地层学与非构造圈闭研究

塔中地区古生界发育4级不整合面。根据不整合面的发育特征,将塔中地区古生界划分为3个巨层序、8个超层序和19个三级层序。不同类型的非构造圈闭均与多期重大不整合面(地层削截面、超覆面、缺失面等)和层序界面的分布相关。将塔中地区古生界非构造圈闭划分为三大类、10个亚类,并总结了不同类型的非构造圈闭的特征与分布规律:各种非构造圈闭主要集中在一级层序MS1、MS2顶面的上下岩性段内,且规模很大,是塔中地区勘探的重要领域。此研究对在塔中地区寻找非构造圈闭油气藏有较好的指导意义。

Paleozoic Sequence Stratigraphy and Non-structure Trap Study in Tazhong area

There developed four grades of unconformities in Paleozoic in Tazhong area. According to the development features of unconformity surface, Paleozoic can be divided into 3 megasequences, 8 supersequences and 19 tertiary sequences. Different kinds of non-structural traps are relevant to large unconformities developed in multiple periods (stratigraphic truncation, overlap, and lacuna surface, etc.) and the distribution of sequence interface. Paleozoic non-structural traps in Tazhong area can be divided into 3 types and 10 subtypes. This paper summarizes their features and distribution laws: the non-structural traps with large size mainly lie in the intervals above and below the top of MS1 and MS2 sequence, and are the important domain for exploration. This can guide the search for non-structural trap reservoirs in Tazhong area.