公开(公告)号：US20130158876A1

公开(公告)日：2013-06-20

申请号：US13656287

申请日：2012-10-19

Applicant: Schlumberger Technology Corporation

Inventor： James A. Grau

IPC: G01V5/10 ,  G06F19/00

CPC classification number: G01V5/101

Abstract: A method for determining weight fractions of a plurality of elements in a subsurface formation penetrated by a wellbore includes determining weight fractions of a first plurality of elements using measurements of capture gamma rays made in the wellbore. The capture gamma rays result from bombardment of the formations with high energy neutrons. A weight fraction of a second plurality of elements is determined using measurements of inelastic gamma rays made in the wellbore resulting from bombardment of the formations with high energy neutrons. The weight fraction for the second plurality is determined by setting a transformation factor for those elements common to both the first and second plurality to result in a statistically equivalent weight fraction for the common elements as determined, for the first plurality of elements. Weight fractions of elements in the second plurality not common to the first plurality of elements is determined using the set transformation factor.

Abstract translation: 用于确定由井眼穿透的地下地层中的多个元素的重量分数的方法包括使用在井筒中制造的捕获伽马射线的测量来确定第一多个元素的重量分数。 捕获伽马射线是由高能中子轰击地层造成的。 使用通过用高能中子轰击地层而产生的在井筒中制造的非弹性γ射线的测量来确定第二多个元件的重量分数。 通过为第一和第二多个共同的那些元素设置变换因子来确定第二多个的权重分数，以产生对于第一多个元素确定的公共元素的统计学上等同的权重分数。 使用设定的变换因子来确定与第一多个元素不相同的第二个多个元素中的元素的权重分数。