Sedimentary facies and evolution of the lower Urho Formation in the 8th area of Karamay oilfield of Xinjiang, NW China

H. Kuang, Guangchun Jin, Zhenzhong Gao
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Abstract

Abstract On the basis of core descriptions, examinations of rock thin sections, and EMI logging, a fluvial-dominated fan delta depositional system consisting of the fan delta plain and front subfacies from the lower Urho Formation of the Upper Permian in the Karamay oilfield of Xinjiang, NW China, was recognized in this research. The typical characteristics of this kind of fan delta is the depositional processes that were dominated by the fluvial and tractive current structure that developed very well, while pro-fan delta and gravity deposition occurred very less. The key microfacies associations in the fan delta plain subfacies are braided channel, sheeted flow, mud flow, and sieve deposits, while the fan delta front subfacies commonly contains subaqueous channels, interdistributary channels, debris flow, grain flow, and subaqueous levee microfacies. A study of image logging, grain size, and compositions of rocks indicate that provenance directions are different from the early to the last depositional periods of the Urho Formation, i.e. it changed from the southwest initially to the northwest in the latest among the fifth period to the first period. In addition, with the corresponding provenance direction changing, the sedimentary facies also transform regularly. This paper illuminated the sedimentary facies, subfacies and microfacies and also discussed deeply the depositional distribution and evolution of the lower Urho Formation. A sedimentary model of the fluvial-dominated fan delta was presented in this paper.
新疆克拉玛依油田8区下乌尔河组沉积相及演化
摘要通过岩心描述、岩石薄片检验和电磁干扰测井,确定了克拉玛依油田上二叠统乌尔河组下段扇三角洲平原与前缘亚相组成的以河流为主导的扇三角洲沉积体系。扇三角洲的典型特征是以河流和牵引流构造为主导的沉积过程,发育良好,亲扇三角洲和重力沉积较少。扇三角洲平原亚相的主要微相组合为辫状河道、片状流、泥流和筛状沉积,而扇三角洲前缘亚相一般包括水下河道、分流间河道、泥石流、颗粒流和水下堤防微相。通过影像测井、岩石粒度、岩石组成等研究表明,乌尔河组沉积早期至晚期物源方向不同,在第五期至第一期中,物源方向由最初的西南向西北方向转变。此外,随着相应物源方向的改变,沉积相也有规律地转变。阐明了下乌尔河组沉积相、亚相和微相,并对下乌尔河组沉积分布和演化进行了深入探讨。提出了河控扇三角洲的沉积模式。
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Cogent Geoscience
Cogent Geoscience GEOSCIENCES, MULTIDISCIPLINARY-
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