Fan Delta Sedimentary Characteristics of of the Lower Jurassic Badaowan Formation in the Eastern Margin of the Junggar Basin

doi:10.11885/j.issn.1674-5086.2017.05.18.03

Abstract

Abstract: The Member 1 of the Lower Jurassic Badaowan Formation (J₁b) in the Dishuiquan region at the eastern margin of the Junggar Basin is a newly discovered oil and gas reservoir. In-depth reservoir sedimentation research on this member is important for understanding the favorable conditions for reservoir formation in the region and evaluating the potential reserves. The Di20 site in the eastern Dinan uplift was studied in this project. A detailed core description was integrated with well logging and outcrop measurements to propose the following principle:" Constrained by the marker beds and based on the microfacies, spin echo and reserve determination are conducted at local and region scales, respectively." Spatial comparison of constituent sand bodies was thereby performed to investigate the sedimentation characteristics and modes of the fan delta in the eastern Dinan uplift. The results demonstrate that the sandstone-conglomerate J₁b reservoir in the region is a typical fan delta deposit formed as water from mountains entered lakes. It is characterized by small plains and large fronts. The microfacies can be further divided into underwater distributary channels, braided bars, underwater distributary bays, delta-front sheet sand, delta-fronts sand, and other facies. The J₁b reservoir in the Dishuiquan region is the piedmont deposit of the Kalamaili Mountain with abundant source materials. Near-source delta-fan deposits often result when the fan shapes are mainly controlled by paleo-geomorphological characteristics and the supply of source materials.

Key words: Junggar Basin, Dishuiquan Area, Member 1 of the Badaowan Formation, fan delta, sedimentary characteristics, spatial evolution

CLC Number:

TE122

XU Lei, WANG Zongjun, WANG Pangen, SHANG Zhilei, GUO Xiao. Fan Delta Sedimentary Characteristics of of the Lower Jurassic Badaowan Formation in the Eastern Margin of the Junggar Basin[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 9-16.

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