公开(公告)号：US20160170079A1

公开(公告)日：2016-06-16

申请号：US15018732

申请日：2016-02-08

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  David Alan Rose

IPC: G01V5/10

CPC classification number: G01V5/102 ,  G01V5/101

Abstract: A method for pulsed neutron well logging of a subsurface formation, includes irradiating the formation with a plurality of bursts of neutrons of a group of selected durations; detecting gamma rays resulting from interaction of the neutrons during a group of selected time gates which contains at least some early and late gamma ray counts. The gamma rays are detected at at least two axially spaced apart locations from a position of the irradiating. In a computer, a ratio TRat is determined between the sum of detected gamma rays at a first axial spacing to the sum at a second axial spacing. A borehole correction is performed according to a function related to the ratio TRat before converting the ratio TRat to a hydrogen index or porosity of the subsurface formation.

Abstract translation: 用于地下地层的脉冲中子测井的方法包括用多组选定持续时间的一组中子照射地层; 检测在包含至少一些早期和晚期伽马射线计数的所选择的时间门组期间由中子的相互作用产生的伽马射线。 在与照射位置的至少两个轴向间隔开的位置处检测伽马射线。 在计算机中，在第一轴向间隔处的检测到的伽马射线之和与第二轴向间隔处的和之间确定比率TRat。 在将比率TRat转换为地下地层的氢指数或孔隙率之前，根据与比率TRat相关的函数进行井眼校正。

公开(公告)号：US20160047938A1

公开(公告)日：2016-02-18

申请号：US14920359

申请日：2015-10-22

Applicant: Schlumberger Technology Corporation

Inventor： James A. Grau ,  David Alan Rose ,  John P. Horkowitz

IPC: G01V5/10 ,  G01V99/00

CPC classification number: G01V5/101 ,  G01V99/00

Abstract: A method for correcting determined sulfur content in formations penetrated by a wellbore for sulfur in the wellbore includes determining an amount of sulfur from spectral analysis of gamma rays detected by a well logging instrument disposed in the wellbore. The gamma rays result from imparting neutrons into the formations. The method includes determining if strontium is present in fluid disposed in the wellbore. An amount of strontium is determined from the spectral analysis. A corrected sulfur content of the formation is determined based on the determined amount of strontium.

Abstract translation: 用于校正在井筒中用于硫的孔眼穿透的地层中确定的硫含量的方法包括通过由设置在井筒中的测井仪器检测的γ射线的光谱分析来确定硫的量。 伽马射线是由中子赋予地层造成的。 该方法包括确定在井眼中布置的流体中是否存在锶。 从光谱分析中确定一定量的锶。 基于确定的锶量确定地层的校正硫含量。