Humid Fan-delta Sedimentation Characteristics in the Badaowan Formation in the Northwestern Junggar Basin

doi:10.11885/j.issn.1674-5086.2017.07.18.01

Abstract

Abstract: There are abundant oil and gas resources in the Jurassic Badaowan Formation at the northwestern margin of the Junggar Basin, but they are mostly located in the sand-conglomerate reservoirs on the southeastern side of the Ke-Wu fault belt. Recent exploration reveals that there are plentiful oil and gas reserves and higher exploration potential in the basin area far away from the fault belt. There is, however, little knowledge of the types and distributions of the sedimentary facies in the study area. Based on an integrated analysis of data obtained from well drilling and logging, core samples, and geophysical measurements the Badaowan Formation is divided into two three-fold stratigraphic sequences and various facies, including fan-delta facies, braided river facies, braided river delta facies, and lake facies, are identified. Fan-delta facies dominate the lower sequence of the Badaowan Formation, while the upper sequence is characterized by braided river and braided river delta facies. The fan-delta facies in the study area formed in humid environments. They are widely distributed, fine-grained, thick at the facies fronts and oil-rich in the plains. These facies are clearly different from the arid fan-delta facies developed in the Paleogene rift basins in Eastern China.

Key words: fan-delta facies, humid environments, delta-front facies, Badaowan Formation, reverse faults

CLC Number:

TE122

QIU Zhengke, WANG Hui, LI Ting, TAO Wulong, PU Bo. Humid Fan-delta Sedimentation Characteristics in the Badaowan Formation in the Northwestern Junggar Basin[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 47-58.

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