Sedimentary Facies and Its Lateral Distribution of the
Middle-lower Jurassic in Amu Darya Right Bank Area

doi:10.11885/j.issn.1674-5086.2014.03.23.01

Abstract

Abstract:

The aim of this paper is to study the characteristics of sedimentary facies of the Middle-lower Jurassic in Amu
Darya Right Bank Area according to the analysis of lithology，logging facies，seismic facies as well as regional structural and
sedimentary background. The research shows that the Middle-Lower Jurassic stratum consists predominately of continental
clastic deposits with small amount of marine-continental transitional sediments at the top. On this basis，four sedimentary
subfacies including delta front，lakeshore，shallow lake，subtidal zone and twelve microfacies are identified. By studying
the sedimentary evolution and lateral distribution characters，we identified two transgressive sequences in this stratum. The
dominate sedimentary environment is shore-shallow lacustrine subfacies，while delta front subfacies are only present in limited
areas of A block and the eastern B block in the early Middle-lower Jurassic. The lacustrine and deltaic environment contributes
not only to the development of high quality source rocks，which are wide-spreading，but also to the development of reservoirs
in the study area.

Key words: Amu Darya, middle-lower Jurassic, clastic rocks, sedimentary facies, delta front

Zhang Ting1, Wang Qiang1, Liu Bin2. Sedimentary Facies and Its Lateral Distribution of the
Middle-lower Jurassic in Amu Darya Right Bank Area[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.03.23.01.

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