摘要
勘探实践表明鄂尔多斯盆地东部山西组山32亚段含气性与岩性存在直接关系,石英砂岩储层往往是高产层。因此,寻找石英砂岩储层是该区勘探开发的重点。在岩心刻度测井的基础上,利用测井参数建立了3种类型砂岩的测井判别蛛网图版,并回归了石英相对百分含量与测井参数之间的关系式,利用此关系式对山32亚段砂岩类型进行识别,判识准确率达到80%。同时结合岩石薄片鉴定等资料,绘制了研究区砂岩类型平面分布图。单井结合平面图分析发现研究区存在3个环带状石英砂岩分布区域。从大地构造环境、物源、沉积环境等方面对该区山32亚段石英含量普遍较高和平面环带状分布原因进行了探讨,认为受海退影响的海岸线频繁变迁是形成石英砂岩分布的主要因素。
According to exploration,there is a direct relationship between sandstone type and gas saturation in the east Ordos basin.The high-production layer emerges from quartzose sandstone.Therefore,the emphasis of exploration and development is to explore quartzose sandstone reservoir.After calibrating well logging with core analysis,three types of spider web chart of sandstone are drawn with well logging parameters.Regression equations on quartz content of sandstone and logging parameters is established,which is used to identify the types of sandstone.The rate of accuracy is 80%.At the same time,the sandstone type plane distribution map has been drawn up with rock slice and research data.In the research area there are three zonal distributive region of quartzose sandstone.From the tectonic environment,source and sedimentary environment,the reason of that has been carried on the discussion.The primary factor was frequent coastlines influenced by regression.This research is to provide the basis for the further exploring of gas sweet point and analyzing the detritus grain component with well logging data.
出处
《现代地质》
CAS
CSCD
北大核心
2010年第5期925-933,共9页
Geoscience
关键词
鄂尔多斯盆地
砂岩类型
判别图版
回归方程
成因探讨
Ordos basin
sandstone type
discriminant chart
regression equation
analysis of genesis
