准噶尔盆地春光地区新近系沙湾组辫—曲演化与成藏特点

岳欣欣

doi:10.11781/sysydz202106967

准噶尔盆地春光地区新近系沙湾组辫—曲演化与成藏特点

doi: 10.11781/sysydz202106967

岳欣欣

中国石化河南油田分公司勘探开发研究院, 郑州 450018

基金项目:

中国石化科技部项目 P19016-2

详细信息

作者简介:
岳欣欣(1986-), 男, 助理研究员, 从事油气勘探开发研究。E-mail: 345169296@qq.com

中图分类号: TE122.3
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-23
- 修回日期: 2021-09-09
- 刊出日期: 2021-11-28

Meander-braided transition features and hydrocarbon accumulation characteristics in Neogene Shawan Formation, Chunguang exploration block, Junggar Basin

YUE Xinxin

Research Institute of Exploration and Development, Henan Oilfield Company, SINOPEC, Zhengzhou, Henan 450018, China

摘要

摘要: 春光地区为准噶尔盆地西北缘重要的含油气区块之一，新近系沙湾组为主要的产能、探明储量贡献层系。为满足精细勘探的需求，亟需对沙湾组的沉积特征、沉积演化和成藏模式进行深入研究。综合应用岩心、测井和地震资料，通过地层沿层切片分析，认为研究区发育辫状河、曲流河沉积，且同一时期存在“东辫西曲”的沉积特征，明确了不同时期的沉积演化过程；通过构造沉降及地形、基准面旋回变化、物源供给及古气候分析，明确河型转换控制因素；通过对不同河型油气藏成藏特点及识别特征的分析，建立了新的成藏模式，形成立体成藏格局；结合成藏认识，明确了有利勘探方向，有效拓展了勘探领域，取得了较好的勘探效果，为春光地区的增储上产提供了理论支撑。
- 河型转化 /
- 主控因素 /
- 沉积演化 /
- 成藏特点 /
- 新近系 /
- 春光地区 /
- 准噶尔盆地
Abstract: The Chunguang exploration area is one of the important oil-gas bearing blocks on the northwestern margin of Junggar Basin. Considerable number of high-yield wells have been developed in the Neogene Shawan Formation during the earlier exploration stage, and great exploration and development potential in this area were indicated. In order to meet the needs of delicate exploration, a further study of the sedimentary characteristics, sedimentary evolution and reservoir forming models were promising for the further exploration. With the analysis of cores, loggings and amplitude slices, the typical sedimentary microfacies of diara and point bar deposits were identified in the study area. Then it was considered that braided river and meandering river deposits were developed in the study area with the feature of "braided river deposits in the east part of study area and meandering river deposits in the west part". Moreover, the sedimentary evolution process was determined and a new sedimentary model was established. With the flattening of terrain, the continuous rising of base level, the weakening of provenance supply and the changing of climate from humid to heat, the sedimentary system was gradually transformed from braided river deposits to meandering river deposits. By the study of reservoir accumulation and recognition characteristics of different river-type deposits, a new reservoir forming model was built. Combined with the understanding of reservoir formation, the favorable exploration direction was indicated, the exploration field was effectively expanded, and good exploration results were obtained, which provided theoretical support for the increase of reserves and production in the Chunguang exploration area.
- river-pattern transition /
- main controlling factor /
- sedimentary evolution /
- reservoir accumulation characteristics /
- Neogene /
- Chunguang exploration block /
- Junggar Basin

HTML全文

图 1 准噶尔盆地春光地区构造位置(a)和地层系统(b)

Figure 1. Tectonic location (a) and strata system (b) of Chunguang block, Junggar Basin

下载: 全尺寸图片幻灯片

图 2 准噶尔盆地春光地区研究区典型岩心照片

Figure 2. Typical core images of Shawan Formation in Chunguang block, Junggar Basin

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图 3 准噶尔盆地春光地区研究区不同河型沉积特征

Figure 3. Sedimentary characteristics of different river types of Chunguang block, Junggar Basin

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图 4 准噶尔盆地春光地区过C1井地震剖面反映垂向上沉积相变化

剖面位置见图 1a。

Figure 4. Vertical changes of sedimentary facies in seismic profile of well C1, Chunguang block, Junggar Basin

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图 5 准噶尔盆地春光地区西南部层位最大波谷振幅属性与沉积相

Figure 5. Images of maximum trough amplitude attribute and sedimentary facies in the southwest of Chunguang block, Junggar Basin

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图 6 准噶尔盆地春光地区研究区辫状河—曲流河沉积演化模式

Figure 6. Models of sedimentary evolution of braided river and meandering river in Chunguang block, Junggar Basin

下载: 全尺寸图片幻灯片

图 7 准噶尔盆地春光地区辫状河油气藏特点

Figure 7. Reservoir characteristics of braided-river deposits in Chunguang block, Junggar Basin

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图 8 准噶尔盆地春光地区曲流河砂体叠置特征与油气藏特点

Figure 8. Reservoir characteristics of meandering-river deposits in Chunguang block, Junggar Basin

下载: 全尺寸图片幻灯片

图 9 准噶尔盆地春光地区沙湾组油气成藏模式

Figure 9. Model of oil and ags accumulation of Shawan Formation in Chunguang block, Junggar Basin

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图 10 准噶尔盆地春光地区曲流河砂体尖灭带刻画及有利区带

Figure 10. Pinchout zone characterization and favorable zone of meandering-river deposits in Chunguang block, Junggar Basin

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