ALEXANDRIA, Va., March 12 -- United States Patent no. 12,248,115, issued on March 11, was assigned to CHINA PETROLEUM & CHEMICAL Corp. (Beijing).

"Method and apparatus for using pulsed neutron generators and dual-function detectors to obtain formation mineralogy" was invented by Sheng Zhan (Houston), Jeremy Zhang (Houston), Zongqi Chen (Houston) and Xianghua Liu (Houston).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for obtaining elemental concentration and determining the formation mineralogy uses a tool having multiple dual-function detectors that can detect both neutrons and gamma rays simultaneously. The method includes emitting neutrons into the formation, detecting neutron and gamma ray signa...