摘要
以四川盆地东部大池干井构造带三叠系嘉陵江组二段一亚段(T1j21)裂缝性储集层为例,从构造曲率角度出发,预测高陡构造地区薄层碳酸盐岩裂缝性储集层分布区。采用趋势面拟合法和差分法计算面曲率,用三点圆弧法及曲线拟合法计算线曲率,在此基础上,将4种数学方法计算得到的曲率值进行归一化处理,得到各方法的相对曲率值并取其最大值(即综合曲率)进行裂缝分布预测,即综合曲率法,以克服单一曲率计算方法预测的不足。通过与油气显示、气井产能测试等资料对比分析,认为用综合曲率法预测裂缝效果优于单一曲率方法,综合曲率值与区内气井产能的相关系数最大,说明综合曲率法提高了曲率法预测裂缝的准确程度,能更好地预测地下构造裂缝的分布范围。
Taking the T1j2^1 fracture reservoir of the Dachiganjing structure belt as a case, this article adopts the trend surface fitting method and the difference method to calculate facial curvature, uses the three point cyclographic method and the curve fitting method to calculate linear curvature, then normalizes the four obtained curvature values and gets the four corresponding relative curvature values. The maximal relative curvature value （i. e. comprehensive curvature） is used to forecast fracture type reservoirs. This is called the comprehensive curvature method and it can overcome the deficiency of the single curvature calculating method. The analyses of the oil and gas shows in drilling and the daily gas production data of gas wells show that the new method has better effects than the single curvature calculating method in fracture forecasting. The correlation coefficient between the comprehensive curvature value and the daily gas production data is the biggest, indicating that the new method improves the forecasting accuracy.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期431-436,共6页
Petroleum Exploration and Development
基金
中石油中青年创新基金(06E1018)
四川省重点学科建设项目(SZD0414)
关键词
川东
大池干井构造带
高陡构造
碳酸盐岩
薄层
综合曲率法
裂缝预测
East Sichuan Basin
Dachiganjing structure belt
precipitous structure
carbonate rock
thin bed
comprehensive curvature method
fracture forecasting
