断裂带充填物中泥质质量分数的确定及断层封闭性评价-断块油气田.PDF

断 块 油 气 田 17 卷 2 期 FAULT-BLOCK OIL GAS FIELD 2010 年3 月 173 文章编号 1005-8907 渊20 10冤02- 173-04 断裂带充填物中泥质质量分数的确定及断层封闭性评价 周林帅 张卫海 黄 峰 陈 强 郭丽丽 渊中国石油大 地球资源与信息学院 山东东营 257061 冤 摘 要 断裂带泥质充填物是影响断层封闭性的重要因素袁也是断层封闭性评价的重要方面遥 为了能够较准确地评价断 裂带内充填物的泥质质量分数袁试图应用自然伽马测井响应特性袁对断裂带泥质质量分数进行判断遥 在确定断裂带位置的 基础上袁分析自然伽马测井曲线特征袁确定自然伽马平均值尧 井段纯泥岩自然伽马平均值及纯砂岩自然伽马数值袁应用自 然伽马计算地层泥质质量分数的公式袁确定断裂带充填物中泥质质量分数指数和泥质质量分数袁并建立其等级划分标准袁 判断断层的封闭性遥 由于自然伽马能够较好地反映地层岩性袁尤其对泥岩反映较为敏感袁故应用其计算泥质质量分数精度 相对较高袁在评价断裂带泥质质量分数及断层封闭性时更具有优势遥 该方法在高邮凹陷西部地区得到了较好的应用遥 关键词 断裂带曰泥质质量分数曰泥质质量分数指数曰断层封闭性曰自然伽马曲线 中图分类号 P6 18 文献标识码 A Determination of shale content in fault filling material and evaluation of fault sealing Zhou Linshuai Zhang Weihai Huang Feng Chen Qiang Guo Lili (College of Geo-Resources and Information, China University of Petroleum, Dongying 257061, China) Abstract: Shaly filling material is an important factor of influencing fault sealing in faulted zone and is also an important respect of fault sealing evaluation. This paper tries to use the response characteristics of gamma ray logging to judge the shale content of faulted zone in order to evaluate the shale content of fault filling material accurately. On the basis of locating the faulted zones, the paper analyzes the characteristics of gamma ray logging curves, determines the average value of gamma ray, average values of gamma ray in pure shale and pure sandstone in this section. Using the calculation formula of formational shale content by gamma ray, we determine the shale content index and shale content of filling material in faulted zones. We have established the classifying standards of their order in order to judge the fa