公开(公告)号：US20210355822A1

公开(公告)日：2021-11-18

申请号：US16470539

申请日：2018-12-10

Applicant: PETROCHINA COMPANY LIMITED

Inventor： Hongliang WU ,  Ning LI ,  Zhou FENG ,  Changlin LAN ,  Tao LV ,  Kewen WANG ,  Qingfu FENG

IPC: E21B49/00 ,  G01V5/10

Abstract: A gamma ray spectrum unfolding method for elemental capture spectroscopy logging and a device therefor including the steps of first preprocessing the data obtained from an elemental capture spectrometry instrument; constructing a primary element group and an auxiliary element group according to the degree of interactions among the elements via theoretical analysis and numerical calculation of spectrum profiles, characteristic peak channels, and backgrounds of different elements; unfolding by using the least square method based on the construction of the primary element group and the auxiliary element group; and finally reconstructing the spectrum based on theory according to the yield of each element obtained by unfolding with the least square method, and comparing the measured gamma ray spectrum with the reconstructed gamma ray spectrum for error control, thereby improving the spectrum unfolding precision.

公开(公告)号：US20190137648A1

公开(公告)日：2019-05-09

申请号：US16095432

申请日：2017-05-15

Applicant: PETROCHINA COMPANY LIMITED

Inventor： Ning LI ,  Kewen WANG ,  Yujiang SHI ,  Hongliang WU ,  Taiping ZHAO ,  Qingfu FENG ,  Zhou FENG ,  Haitao ZHANG ,  Baoding ZHU ,  Xiaoming YANG

IPC: G01V3/38 ,  G01V3/18 ,  E21B49/00

Abstract: The present application provides a method and a system for determining a saturation exponent of a heterogeneous carbonate reservoir. The method comprises: dividing a target reservoir into at least two reservoir types in accordance with a predetermined rule; obtaining a correspondence relationship between a saturation exponent and a bound water saturation in each of the reservoir types; determining the reservoir type to which a to-be-measured core belongs in accordance with the predetermined rule; obtaining a bound water saturation of the to-be-measured core; and calculating the saturation exponent of the to-be-measured core according to the bound water saturation of the to-be-measured core on the basis of the correspondence relationship of the reservoir type to which the to-be-measured core belongs.

公开(公告)号：US20190056519A1

公开(公告)日：2019-02-21

申请号：US16159052

申请日：2018-10-12

Applicant: PetroChina Company Limited

Inventor： Ning LI ,  Hongliang WU ,  Zhou FENG ,  Peng LIU ,  Kewen WANG ,  Qingfu FENG ,  Yusheng LI

IPC: G01V1/30 ,  E21B49/00 ,  G01V1/50

Abstract: The embodiments of the present disclosure disclose a method and an apparatus for determining the permeability of the reservoir. The method comprises: acquiring logging data corresponding to the two zones at least; determining the permeability of a specified zone in the two zones at least based on logging data corresponding to the specified zone, wherein the specified zone represents any one of the two zones at least; setting weight values corresponding to the at least two zones respectively; and determining the permeability of the reservoir based on the weight values and the permeability respectively corresponding to the two zones at least. The technical solutions provided by the embodiments of the present disclosure can improve the accuracy of the determined permeability of the reservoir.