Patent ID: 11892590
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Measurement (Instruments)
Classification: CPC G  E | IPC E  G

Claim 8:
9. A computer system comprising one or more processors configured to perform operations of:
accessing a plurality of measurement logs encoding measurements taken from more than one well location of an unconventional tight reservoir, wherein the plurality of measurement logs comprise a neutron log, a gamma ray (GR) log, a log of bulk density, a log of sonic slowness, a log of resistivity, and a log of photoelectric measurements;
in response to determining that a measured resistivity from the log of resistivity exceeds 31.62MΩ, determining, based on the plurality of measurement logs, a plurality of parameters that characterize a corresponding set of reservoir properties without determining an elastic rock property or a seismic velocity at the more than one well location of the unconventional tight reservoir;
based on at least a portion of the plurality of parameters, calculating a compressional formation slowness and a shear formation slowness at the more than one well location of the unconventional tight reservoir; and
predicting a fluid type at the more than one well location of the reservoir based on combining a ratio of the compressional formation slowness and the shear formation slowness with at least one of the plurality of parameters such that the fluid type is classified into one of two or more distinct categories and a production of hydrocarbon at unconventional tight reservoir is adjusted according to the classified fluid type, wherein the unconventional tight reservoir is characterized by the measured resistivity exceeding 31.62MΩ.