沉积学报2020，Vol.38Issue(4)：851-867,17.DOI:10.14027/j.issn.1000-0550.2020.054
准噶尔盆地中拐地区上乌尔禾组富火山碎屑砂砾岩储层的古环境及储层机理研究
Study of the Paleoenvironment and Reservoir Mechanism for Volcanic Rich Clastic Reservoirs in the Upper Urho Formation in the Zhongguai Region, Junggar Basin
摘要
Abstract
Based on a comprehensive analysis of petrological and mineralogical features，elemental geochemical, sedimentary environment，physical property, and diagenesis characteristics of the Permian Upper Urho Formation in the Zhongguai area of the Junggar Basin were studied，as was the formation mechanism of glutenite reservoirs layers, which were rich in volcaniclastics in this area. The results show that the palaeoclimate of the Urho Formation in the study area was warm，humid，and generally stable. The abundant precipitation developed multiple sets of thick-grained conglomerate fan delta deposition systems in the Upper Urho Formation. Under the humid climate，chemical weathering occurs，and sediment was carried into the lake by oxygen-enriched fresh water. Hydrolysis releases a large amount of cations，making the lake basin water environment in the Upper Urho Formation period experience salt water oxidation conditions. A large amount of volcanic debris also provided a basic diagenetic fluid environment and material basis for the formation of authigenic minerals for later diagenesis. The physical properties of the Upper Urho Formation reservoir in this area were controlled by the sedimentary environment and diagenesis. The shallow-buried fan delta front submarine distributary channel microfacies gravel is the main target reservoir in the study area，and the space mainly consists of the remaining intergranular pores and dissolved pores，such as feldspar and volcanic debris.关键词
元素地球化学/火山碎屑/沉积环境/砂砾岩储层/中拐地区/准噶尔盆地Key words
element geochemistry/volcaniclastic/sedimentary environment/glutenite reservoir/Zhongguai area/Junggar Basin分类
天文与地球科学引用本文复制引用
丁超,庞燕青,孟亚玲,黄钰珑,李闻东,张顺存,郭晖,李佳思,张明峰..准噶尔盆地中拐地区上乌尔禾组富火山碎屑砂砾岩储层的古环境及储层机理研究[J].沉积学报,2020,38(4):851-867,17.基金项目
国家自然科学基金项目(41872145,41802174) （41872145,41802174）
甘肃省重点实验室专项(1309RTSA041) （1309RTSA041）
甘肃省自然科学基金(17JR5RA293) （17JR5RA293）
