Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 6-12.doi: 10.3969/j.issn.1673-8926.2015.02.002

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Sedimentary sequence and stratigraphic unconformity trap of Jurassic in Sarybulak area, South Turgai Basin

RAN Huaijiang 1,2   

  1.  1. College of Geosciences ， China University of Petroleum ， Beijing 102249 ， China ； 2. Geoscience Center ，Great Wall Drilling Company ， CNPC ， Beijing 100101 ， China
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

The South Turgai Basin in kazakhstan is an important hydrocarbon prospect area, and influenced by the regional structure, the development evolution of Jurassic sedimentary sequence is closely related with tectonic evolution. Because the unexplored favorable structural traps gradually reduced in the study area, the lithostratigraphic reservoirs become an important exploration target. Based on comprehensively analysis of seismic, well logging and core data, through tectonic evolution analysis, establishing sequence stratigraphic framework and sedimentary facies analysis, this paper studied the characteristics of sedimentary sequence and stratigraphic unconformity trap of Jurassic in Sarybulak of A prospect area, South Turgai Basin. The results show that: ①The Jurassic and Cretaceous in the A prospect area experienced three times of large tectonic movements, and formed three second-order sequences. In those second-order sequence stratigraphic frameworks, the target formations of Jurassic can be divided into seven third-order sequences, and each third-order sequence can be subdivided into two to three systems tracts. ②Lacustrine and braided delta sedimentary systems mainly developed in early Jurassic fault depression stage（SQ1 and SQ2）, lacustrine and delta sedimentary systems mainly developed in Middle Jurassic fault-depression transform stage（SQ3 and SQ4）, and lacustrine, delta and fluvial sedimentary systems mainly developed in Late Jurassic depression stage（SQ5，SQ6 and SQ7）. ③The favorable stratigraphic unconformity traps mainly include two types: stratigraphic erosion unconformity traps formed by SQ1, SQ2 and the overlying strata, and stratigraphic onlap unconformity trap formed by SQ5 and the underlying strata.

Key words: shale oil, reservoir characteristics, accumulation conditions, main controlling factors

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