准噶尔盆地车排子地区沙一段复合扇三角洲沉积及控制因素
- 张曰静1,
- 修金磊1,
- 谢利华2, ,
- 石好果1,
- 商丰凯3,
- 张卫平4,
- 冯庚4,
- 关旭同4,
- 冷佳宣4,
- 李严4
- 收稿日期:
2023-04-14
- 网络出版日期:
2024-04-09
摘要: 准噶尔盆地车排子地区沙一段近源体系是该区的主要储层，但近源体系分布范围及沉积特征存在争议。综合运用录井、岩心、测井、分析化验及地震资料等，并结合现代扇三角洲沉积，研究沙一段四级层序地层格架内近源体系沉积特征及控制因素，建立近源体系沉积模式。结果表明：近源体系主要为东西两个复合扇三角洲沉积，西翼为复合浅水扇三角洲，东翼为复合扇三角洲沉积；微相类型主要以扇三角洲前缘水下分流河道为主；前缘水下分流河道由岸向湖岩性由砾岩-砂砾岩-含砾中粗岩屑、长石岩屑砂岩-含砾长石岩屑细砂岩变化，岩屑成份以火成岩屑为主，砾石成份以火成岩为主，近湖含泥砾。低位-湖侵沉积楔的上超尖灭线受控于坡折带或缓坡带，上超尖灭线与古地貌等值线大体一致，沙一段1砂组近源体系主要分布于隆起方向的第三个坡折带以下，与远源体系在工区南部交互沉积，湖相范围最小；沙一段2砂组近源体系主要在第三坡折带以上沉积，湖相范围最大；沙一段3砂组近源体系在坡折带附近沉积。东翼较陡，沟谷规模较小，复合扇三角洲规模较小，西翼坡度较缓，沟谷规模较大，复合浅水扇三角洲规模较大。古构造地貌及相对湖平面变化是车排子地区沙一段近源体系沉积演化和分布的主控因素。
Depositional characteristics of complex fan delta of member 1 of Shawan formation in Chepaizi area， Junggar Basin
- Received Date:
2023-04-14
- Available Online:
2024-04-09
Abstract: Near-source sedimentary system of member 1 of Shawan formation is the main reservoir in Chepaizi area of Junggar basin. Neverthless, there have been different points on depositional characteristics of it. On the basis of previous studies， using the mud logging data， core data， logging data and seismic data, combining with modern fan delta sediment, the depositional characteristics of near-source sedimentary system within the 4th sequence stratigraphic framework of member 1 of Shanwan formation were investigated, and the sedimentary model of it was built up. The results are as follows: (1) Near-source system was made of two complex fan deltas, one is shoal complex fan deltas, the other is complex fan deltas. The main microfacies were distributary and sand bar of fan delta front. (2) The lithology of the distributary was changed from shoreline to lake by conglomerate - glutenite –medium-coarse lithic sandstone bearing conglomerate - medium-coarse feldspar lithic sandstone bearing conglomerate - feldspar lithic fine sandstone bearing conglomerate. The lithic composition was dominated by igneous lithic, while the gravel composition was dominated by igneous gravel and mud-gravel. (3) Near-source system of sand group 1 of member 1 of Shawan formation mainly distributed below the third slope break zone. It reached in the the middle of the project where the far-source system reached as well, and they interacted with each other. Lacustrine range was the smallest during this stage. Near-source system of sand group 2 of member 1 of Shawan formation mainly distributed above the slope break zone and the lacustrine range was the largest this period. Near-source system of sand group 3 of member 1 of Shawan formation mainly distributed near the slope break zone. The slope of the eastern wing was steeper, the gully scale was smaller, the complex fan delta scale was smaller, the slope of the western wing was slower, the valley scale was larger, the composite fan delta scale was larger. The conclusion is that paleogeomorphology and the relative lacustrine level change controlled the sedimentary characteristics of the near-source systems.
张曰静, 修金磊, 谢利华, 石好果, 商丰凯, 张卫平, 冯庚, 关旭同, 冷佳宣, 李严. 准噶尔盆地车排子地区沙一段复合扇三角洲沉积及控制因素[J]. 沉积学报. doi: 10.14027/j.issn.1000-0550.2023.132
Depositional characteristics of complex fan delta of member 1 of Shawan formation in Chepaizi area， Junggar Basin[J]. Acta Sedimentologica Sinica. doi: 10.14027/j.issn.1000-0550.2023.132
| Citation: |
Depositional characteristics of complex fan delta of member 1 of Shawan formation in Chepaizi area， Junggar Basin[J]. Acta Sedimentologica Sinica. doi: 10.14027/j.issn.1000-0550.2023.132
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