摘要
通过对鄂尔多斯盆地大牛地气田众多钻井岩心的详细观察,进行了岩相划分、沉积构造、剖面结构及测井相分析,进而将研究区下石盒子组盒3段划分为辫状河和曲流河沉积相,并进一步细分出河床滞留、心滩、边滩等微相。根据研究区700余口井各小层砂体厚度的统计结果及井间沉积微相的对比研究,系统编制了大牛地气田盒3段不同时期的沉积微相平面分布图。研究认为:受物源和古地貌控制,不同时期、不同位置的沉积微相存在差异,H3-1小层在西南区为辫状河至曲流河过渡带,具辫状河沉积特征;H3-1大部分、H3-2和H3-3为曲流河沉积。此研究成果为地层圈闭评价及进一步的开发评价提供了重要的地质依据。
This paper conducts the analysis of sedimentary structure, section structure and log facies and lithofacies classification after a detailed observation and description of rock cores in Daniudi Gas Field of Ordos Basin. He 3 member of Shihezi Formation in the study area can be divided into the sedimentary facies of braided river and meandering river, and further can be subdivided into channel lag, channel bar and point bar microfacies. With the statistic data of sandbody thickness of every layer collected from over 700 wellsand the comparison of sedimentary microfacies of these wells, this paper makes the plane distribution chart of sedimentary mierofacies of He 3 member in Daniudi Gas Field at different geologic periods. It is believed that there are the differences for sedimentarymicrofacies at different geologic periods and in different areas because of the effect of provenance and paleogeomorphology. H3-1 is a transitional area from braided river to meandering river, with the characteristics of braided river sediment. The majority of H3-1, H3-2 and H3-3 are meandering river deposition. The results can provide the important geological references for stratigraphic trap evaluation and further development evaluation.
出处
《断块油气田》
CAS
2012年第2期149-153,共5页
Fault-Block Oil & Gas Field
基金
国家科技重大专项"大牛地致密低渗气田岩相古地理演化与岩相工业制图"(2008ZX05045-001)
关键词
沉积微相:盒3段:大牛地气田
sedimentary microfacies
He 3 member
, Daniudi Gas Field
