新疆尼勒克地区下侏罗统三工河组辫状河三角洲沉积
- 江汉石油学院地质系 湖北荆州 434102
基金项目:
中国石油天然气集团公司油气储层重点实验室项目(951090112)
作者简介:
李维锋,男,1960 年出生,博士副教授,沉积学盆地分析
- 收稿日期:
2001-04-14
- 修回日期:
2001-07-10
- 刊出日期:
2001-12-10
摘要: 新疆伊宁盆地早侏罗世为一内陆坳陷盆地,沉积了一套冲积—湖泊环境下的碎屑岩沉积体,其中三工河期盆地周缘广泛发育辫状河进积到湖泊中而形成的辫状河三角洲。三角洲三层结构清楚,由下而上出现前辫状河三角洲亚相、辫状河三角洲前缘亚相及辫状河三角洲平原亚相,呈明显的进积层序。辫状河三角洲特征显著,明显有别于其它类型的三角洲,可见到九种特征各异的微相。辫状河三角洲的主体是由含砾砂岩及中、粗粒砂岩组成的辫状河道砂坝及水下分流砂坝,单一砂坝呈下粗上细的透镜状,透镜体最大厚度在 0.5～ 3m不等。垂向上许多砂坝透镜体相互叠置而成巨厚砂体。三角洲中交错层理丰富,其中尤以水道砂坝侧向迁移加积而形成的侧积交错层异常发育为标志。
Braided-river Delta of the Lower Jurassic Sangonghe Formation in the Nileke Region, Xinjiang
- Jianghan Petroleum University, Jingzhou, Hubei 434102
- Received Date:
2001-04-14
- Rev Recd Date:
2001-07-10
- Publish Date:
2001-12-10
Abstract: Braided-river deita that braided river systems prograde into an iniand iake is very abundant in the Lower Jurassic Sangonghe Formation in the Yining Basin, Xinjiang. Their characters are distinct and significantiy different from the other types of deitas. The braided-river deitas are deposited by river tractive current sediments, controiied by torrentiai fiood in generai, and are seasonai sediments. There three sedimentary subfacies from bottom to top：probraided-river deita subfacies, braided- river deita front subfacies and braided-river deita piain subfacies, in the braided-river deitas. Nine microfacies are recognised. The deposits of braided-river deitas are mainiy composed of pebbied sandstone and medium-coarse sandstone. The bars of the braided channei and subagueous distributary channei are the main bodies of deitas, and they take the form of ienticuiar bodies. A singie ienticuiar channei sand body has a thickness of 0. 5m ~ 3m. Many, finger-upward ienticuiar channei sand bodies piie verticaiiy up each other. Cross-stratifications are abundant in the braided-river deitas, but iaterai accretion cross-beddings resuiting from iaterai accretion of channei sand bodies are the most principai sedimentary structures and one of the most distinct character of braided-river deitas.
李维锋, 何幼斌, 彭德堂, 王方平, 刘学锋. 新疆尼勒克地区下侏罗统三工河组辫状河三角洲沉积[J]. 沉积学报, 2001, 19(4): 512-516.
| 引用本文: |
李维锋, 何幼斌, 彭德堂, 王方平, 刘学锋. 新疆尼勒克地区下侏罗统三工河组辫状河三角洲沉积[J]. 沉积学报, 2001, 19(4): 512-516.
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LI Wei feng, HE You bin, PENG De tang, WANG Fang ping, LIU Xue feng. Braided-river Delta of the Lower Jurassic Sangonghe Formation in the Nileke Region, Xinjiang[J]. Acta Sedimentologica Sinica, 2001, 19(4): 512-516.
| Citation: |
LI Wei feng, HE You bin, PENG De tang, WANG Fang ping, LIU Xue feng. Braided-river Delta of the Lower Jurassic Sangonghe Formation in the Nileke Region, Xinjiang[J]. Acta Sedimentologica Sinica, 2001, 19(4): 512-516.
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