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- Title
Sedimentary characteristics and model of coarse-gramed shallow-water deita: a case study of Jurassic Sangonghe Formation in Mobri Area, Junggar Bain.
- Authors
SUN Jing; XUE Jingjing; FEI Liying
- Abstract
Take the Jurassic Sangonghe Formation in Mobei Area, Junggar Basin as the example, the sedimentary characteristics and models of the Jurassic Sangonghe Formation were analyzed based on core data, logging, thin sections, well logs and 3D seismic data. The results show that the coarse-grained shallow water delta deposits, which are mainly coarse and medium-coarse sandstone, are widely developed in the Mobei Area. Two grade siope breaks and three zones controliing sedimentation are deveioped in the western depression of well Pen 1. Coarse-grained shallow braided silver delta-lake system develops in the uplift-lope area, forming two subfasies of the inner and outer front, which distribute vertically or obiiquely aiong the lakeshore as a whole in the shape of fiowers or btrds feet. The underwater distsibutary channel sandbody which are mainly coarse and medium-coarse grained feldspar ilthic sandstone is the frontal skeleton. Block and traction flow origin structures are well developed, and thetr physical properties are relatively good. Muli-stage sand bodies are well developed in the vertical and cut and o-vellap each other in the lateral, and continuous distribution. Four front underwater distributary channels which are widely distirbuted and extends far away are developed in the plane near east-west dtrection. The type is the transgressive-regressive, coarse-grained shallow water delta which has a large area and abundant source supply in wet climate. The results may serve as a reference for deepening expiora-ion and development in the Mobsi Area and simllar fields in the Junggar Basin.
- Subjects
JUNGGAR Basin (China); SANDSTONE; SEDIMENTATION &; deposition; ATMOSPHERIC deposition; PROPERTIES of matter
- Publication
Journal of Northeast Petroleum University, 2022, Vol 46, Issue 2, p13
- ISSN
2095-4107
- Publication type
Article
- DOI
10.3969/j.issn.2095-4107.2022.02.002