Depositional System Frameworks of the Jurassic in Junggar Basin

BAO Zhi-dong; LIU Ling; ZHANG Dong-ling; LI Ru-feng; GUAN Shou-rui; KANG Yong-shang; WANG Ying-min; QI Xue-feng; ZHAO Xiu-qi

Abstract

The Jurassic is one of significant oil-bearing strata in Junggar basin with relatively well-reserved sequences, various sedimentary facies and diversiform depositional systems. Based on outcrop profiles, well data, logging data and seismic data, the Jurassic can be divided into seven sequences consisted of alluvial fan, stream, delta,fan delta, lacustrine and swamp facies which assemblaged in the tracts orderly. Research on p rovenance and lithofacies paleogeography indicates that there were eight sedimentary systems in the Jurassic in the Juggar basin, i. e., alluvial fan2braided stream-meandering stream-delta-lacustrine depositional system off KalamayMountains, delta fan-la-custrine depositional system in Wulungu, braided stream-meandering stream-delta-lacustrine depositional system off Delun Mountains, alluvial fan-braided stream-delta-lacustrine depositional system off Halaalate Mountains, alluvial fan-braided stream-delta-lacustrine depositional system in Cheguai, meandering stream-delta-lacustrine depositional system off Sikeshu Mountains, alluvial fan-braided stream-delta-lacustrine depositional system off Yilinhebier Mountains, meandering stream-delta-lacustrine depositional system offBogedaMountains. Among the eight depositional systems the depositional system off KalamayMountains was well developed in some sequences. These depositional systems controlled the favorable reservoir development of the Jurassic in Juggar Basin

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Depositional System Frameworks of the Jurassic in Junggar Basin

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