A PRELImINARY DISCUSSION OF JURASSIC NON-mARINE SEQUENCE STRATIGRA PHY, EASTERN JUNGGAR BASIN

Abstract

Abstract: In eastern Junggar basin. seven Jurassic alluvial depositional sequences bounded by eight unconformities have been delineated from the integrated interpretation of outcrop. drilling and seismic data. each of which is 1 00 ~ 300m thick. alluvial allocycle thinning upwards. and contains low system tracts of low stand and high stand. In low stand system tract. facies belts of alluvial fan. braided stream. shale-rich. low-sinuosity stream. and meander stream ate distributed in consecutivc order from the margin to center of the basin. In high stand one. coarse clastic sediments are missing at the margin of the existing basin. which is composed of meander stream or swamp facies throughout the basin. The surface of unconformity. deporsitional sequence. and system tract ate all contolled by repeated tectonic. uplift subsidence and still.

Key words: Eastern Junggar basin, Jurassic, Non-marine sequence stratigraphy, Unconformity, Depositionai sequence, System tract

Pu Renhai, mei Zhichao, Tang Zhonghua. A PRELImINARY DISCUSSION OF JURASSIC NON-mARINE SEQUENCE STRATIGRA PHY, EASTERN JUNGGAR BASIN[J]. Xinjiang Petroleum Geology, 1994, 15(4): 335-342.

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