通南巴地区上二叠统-下三叠统层序地层划分

运用海相碳酸盐岩层序地层学及沉积学原理，结合野外露头层序调查和覆盖区钻井、测井及地震等资料的分析，根据层序界面组成、特征、识别标志及形成机理等因素，将四川盆地通南巴地区的上二叠统-下三叠统地层划分为8个Ⅲ级层序、2个Ⅱ级层序。在建立等时地层格架的基础上，对该区上二叠统-下三叠统台盆的沉积充填结构和有利储层发育层位进行了刻划，还指出了本区下一步天然气勘探部署的有利方向为马路背-黑池梁地区的T1f1-P2ch、T1f3、T1j2储层及元坝地区的T1f1-P2ch、T1f3、T2j2储层。

THE UPPER PERMIAN-LOWER TRIASSIC STRATA SEQUENCE CLASSIFICATION IN TONGNANBA AREA, SICHUAN BASIN

By use of sedimentology and sequence stratigraphy on marine carbonatite, combined with strata sequence study on the field outcrops and analysis on data from drilling, seismic logging and testing within an area of coverage, the Upper Permian-Lower Triassic formations in Tongnanba area of the Sichuan Basin could be classified by 8 third-order and 2 second-order strata sequences, in light of many factors of sequence contact bed like the formation, features, identification marks and confirmation mechanism. Based on building up isochronal strata framework, this paper describes deposition fill configuration and strata sequence of well-developed reservoirs in the Upper Permian-Lower Triassic platform of this area. Furthermore, it also points out those advantageous exploration areas for the next step should be T1f1-P2ch, T1f3, and T1j2 in Malubei-Heichiliang zone, and T1f1-P2ch, T1f3, and T1f2 in Yuanba zone.