关键词: 沉积特征, 古环境, 地震沉积学, 浅水辫状河三角洲, 春光探区, 准噶尔盆地

Abstract: Chunguang Prospect Area is located in the northwestern margin of Junggar Basin, with major breakthroughs made in Paleogene exploration in recent years, demonstrating great exploration potential. However, the Paleogene strata are severely denuded, with low well control intensity and unclear sedimentary system and sedimentary characteristics. To this end, core, logging, seismic, analytical and test data were integrated to quantitatively recover the Paleosedimentary environment, clarify the sedimentary characteristics and sedimentary evolution process, and establish the sedimentary model. As found in the study, the Paleogene strata in Chunguang Prospect Area, Junggar Basin were gentle in topography, with shallow water bodies and a dry-hot climate, conducive to the development of shallow water deltas; the sediment grain size was relatively coarse, and deposits were developed in front of shallow braided river delta, further divided into submerged distributary channels, beach dams and distant sand dams, and locally developed estuary dams; the sand bodies were stacked in various forms, the multi-phase migrating stacked sand bodies were favorable oil and gas migration channels in the longitudinal direction, and shallow lacustrine mudstone at the top was favorable for blocking, which was prone to the formation of lithological and fault-lithological reservoirs, expressing profitable exploration prospect. The study provides guidance for the fine exploration and development of Chunguang Prospect Area.

Key words: sedimentary characteristics, Paleoenvironment, seismic sedimentology, shallow braided river delta, Chunguang Prospect Area, Junggar Basin