利用六臂地层倾角测井资料分析地应力  

Using Six-arm Dipmeter Log to Analyze Ground Stress

作　　者：魏阳庆[1] 刘锋[2] 孙彩云[2] 

机构地区：[1]中原油田分公司物探研究院 [2]中原石油勘探局测井公司

出　　处：《断块油气田》2005年第5期78-80,共3页Fault-Block Oil & Gas Field

摘　　要：分析了地层中构造应力的不平衡性在钻井过程中对井眼造成的影响以及它们在地层倾角测井中的反映,说明了椭圆井眼与地层最大水平主应力和最小水平主应力之间的关系,介绍了利用四臂和八臂地层倾角测井资料计算椭圆井眼方位的一般方法。对在六臂地层倾角测井资料的情况下如何进行椭圆井眼方位的统计进行了分析,并采用最佳拟合椭圆轨迹算法推导出在六臂地层倾角测井资料的情况下计算椭圆井眼长短轴大小的公式,为进一步对地层水平地应力定量分析打下了基础。This article analyzes the effects of the unbalanceness of the stratigraphic tectonic stress on holes and their responses in dipmeter log during drilling, and indicates the relations between the elliptical hole and maximum horizontal principal stress and least horizontal principal stress. It describes the general methord of calculating elliptical hole orientation by using four-arm and eight-arm dipmeter log information. Based on six-arm dipmeter log information, the article analyzes how to conduct the statistics of elliptical hole orientation. The formulas of calculating the major-and-minor axis of the elliptical hole have been derived from the six-arm dipmeter log information through using the algorithm of the best-fit elliptical track, which lays a basis for further analyzing horizontal ground stress.

关 键 词：地层倾角测井 水平地应力 椭圆井眼 最佳拟合 地层倾角测井资料 水平地应力 椭圆井眼 水平主应力 井眼方位 钻井过程 构造应力 椭圆轨迹 最佳拟合 

分 类 号：TE151[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]