西准噶尔界山前陆盆地晚期层序地层模式及其应用

SEQUENCE STRATIGRAPHIC MODELS AND THEIR APPLICATIONS TO OIL-GAS PROSPECTING AND EXPLORATION IN THE LATE STAGE OF THE DEVELOPMENT OF THE FORELAND BASIN IN THE WEST JUNGGAR BOUNDARY MOUNTAIN AREA, XINJIANG

关键词:  西准噶尔界山  前陆盆地  层序地层  层序界面  湖水面升降

Key words:  West Junggar boundary mountains  foreland basin  sequence stratigraphy  sequence boundary  lake-level fluctuation

摘要:

西准噶尔界山前陆盆地从晚石炭世到侏罗纪的发育与演化可划分为两个时期:前陆盆地早期（C₃—P）和晚期（T—J）,后者为陆相沉积。本文对前陆盆地晚期的成生机制及其演化进行了定性研究与探索,并建立了盆地生长序列模式和建立了三叠—侏罗纪前陆盆地的层序地层模式。阐述了陆相压陷盆地Ⅰ、Ⅱ型层序界面的标型特征以及前陆盆地晚期沉积体系域和湖水面升降曲线图版用于油气储集空间的预测;并建立了油气预测的储集层序格局模型。

Abstract:

During the Late Carboniferous to Jurassic, the foreland basin in the West Junggar boundary mountain area, Xinjiang shows a depositional evolution from an early stage (from Late Carboniferous to Permian) and a late stage (from Triassic to Jurassic). This paper has presentedthe growth sequence models for the basin on the basis of the qualitative study of the genetic mechanism and evolution of the foreland basin in its late stage of the development and the sequence stratigraphic models for the foreland basin during the Triassic and Jurassic on the basis of the study of sequence stratigraphy in the study area. The present paper also deals with the typomorphic features of the type 1 and 2 sequence boundaries in the indented continental basins and suggests the models for the depositional systems tracts and lake-level curves which may be applied to the prediction of oil reservoirs.