2008•Journal of Oil and Gas TechnologyRequires access
Study on Sequence Stratigraphy and Depositional System in Dabasong Area in the Center of Junggar Basin
Shengli Li
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Abstract
The strata of Sangonghe Formation of Jurassic to the Qingyi Member of Cretaceous in the central part of Junggar Basin were classified into five 3rd order sequences on the base of cores,well logging and seismic data,and strata comparative framework is setup,formation characteristics and depositional systems are studied in target horizons.The study indicates that braided delta front deposits,turbidite fan deposits and lake deposit are developed in the upgrading semi-cycle of J-SQ3 sequence and K-SQ1 sequence.The transition between Dabasong bulge and depression is the favorable place for lithostratigraphy traps because of cyclic deposition and favorable combination of reservoir and seal,the turbidite fans stemmed from slumping of braided delta front are the exploration targets in the upgrading semi-cycle of J-SQ3 sequence and K-SQ1 sequence.