The Internal Characteristics of Carboniferous in Ke-Bai Fault Zone in the Northwest Margin of Junggar Basin

doi:10.11885/j.issn.1674-5086.2019.03.04.02

Abstract

Abstract: In recent years, high-yield oil flow has been produced in exploration wells and evaluation wells drilled in carboniferous system of Ke-Bai fault zone in the northwest margin of Junggar Basin, which shows great exploration potential. The carboniferous thrust of the fault zone is over the Permian, Triassic and Jurassic strata. Under the action of long-term compressive, torsional and rotational stress, the carboniferous inner strata are easy to release stress along the low-density plastic strata, forming anticlines, synclines and faulted anticlines. The work area evolves from imbricate structure to recoil structure from south to north, with imbricate and recoil in the middle and thrust rock mat in the north; explosive tuff is developed in carboniferous system, followed by overflow basalt and andesite. The oil test results show that all kinds of lithology contain oil, and the oil content is mainly related to petrophysical properties and the occurrence degree of fractures. The fracture development position is also the development position of various micro-fractures. The enrichment of oil and gas along deep and large faults and associated secondary faults will be the favorable exploration area for carboniferous system in this area.

Key words: Junggar Basin, Carboniferous internal, anticline, syncline, overflow phase, explosive phase

CLC Number:

TE122

QIU Zhengke, LI Ting, YANG Xing, HU Zongfang, HU Geling. The Internal Characteristics of Carboniferous in Ke-Bai Fault Zone in the Northwest Margin of Junggar Basin[J]. 西南石油大学学报(自然科学版), 2020, 42(5): 39-47.

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