公开(公告)号：US20210018642A1

公开(公告)日：2021-01-21

申请号：US16928303

申请日：2020-07-14

Applicant: Chevron U.S.A. Inc.

Inventor： Ashley Elizabeth SHULER ,  Prasenjit ROY ,  Reynaldo CARDONA

IPC: G01V1/50 ,  E21B49/00

Abstract: A method is described for calibrating seismic data based on statistical properties of shale derived from either well logs in a volume of interest or a global database of statistical properties of shale. The method may be executed by a computer system.

公开(公告)号：US20200041677A1

公开(公告)日：2020-02-06

申请号：US16529870

申请日：2019-08-02

Applicant: Chevron U.S.A. Inc.

Inventor： Prasenjit ROY ,  Anandaroop RAY ,  Reynaldo CARDONA ,  David C. BARTEL ,  Jacob G. TESFAYE

IPC: G01V1/30 ,  G01V1/34

Abstract: A method is described for seismic amplitude analysis including receiving a seismic dataset representative of a subsurface volume of interest wherein the seismic dataset includes an angle or angle stack dimension; select a plurality of sets of sub-cubes in the seismic dataset wherein each set of sub-cubes includes a plurality of the angles or the angle stacks; compute standard score statistics for each of the plurality of sub-cubes; identify amplitude variation with angle (AVA) anomalies based on the standard score statistics for each of the set of sub-cubes; classify the AVA anomalies to generate classified AVA anomalies; and displaying, on a user interface, the classified AVA anomalies as a graphical display. The method is executed by a computer system.

公开(公告)号：US20180128929A1

公开(公告)日：2018-05-10

申请号：US15346824

申请日：2016-11-09

Applicant: CHEVRON U.S.A. INC.

Inventor： Prasenjit ROY ,  Donna J. VENABLE ,  William SAVRAN

IPC: G01V1/30 ,  G01V1/28

CPC classification number: G01V1/306 ,  G01V1/282 ,  G01V2210/614 ,  G01V2210/6244

Abstract: A method is described for porosity mapping of low porosity subsurface reservoirs using seismic data and well logs. The method may compute dry-frame rock properties using fluid substitution modeling based on the well log data; perform porosity expansion of the dry-frame rock properties based on rock physics to generate expanded rock properties; generate synthetic seismic data based on the expanded rock properties; calibrate the seismic dataset with the synthetic seismic data; generate an estimated porosity map based on the calibrated seismic dataset and the synthetic seismic data; and identify geologic features based on the estimated porosity map. The method may be executed by a computer system.

公开(公告)号：US20180038974A1

公开(公告)日：2018-02-08

申请号：US15667709

申请日：2017-08-03

Applicant: CHEVRON U.S.A. INC.

Inventor： Prasenjit ROY ,  Kabilan KRISHNAMURTHY ,  Christopher H. SKELT ,  Joseph P. STEFANI ,  Dileep K. TIWARY

IPC: G01V1/28 ,  G01V1/48

CPC classification number: G01V1/282 ,  G01V1/48 ,  G01V1/50 ,  G01V2210/62 ,  G01V2210/624 ,  G01V2210/66

Abstract: A method is described for creating a petro-elastic model including receiving, at a computer processor, well log data; computing in situ rock properties; calculating dry frame moduli for a range of porosities based on a rock physics model such as a modified critical porosity model; performing fluid substitutions and computing elastic properties by statistical sampling for the range of porosities; creating a petro-elastic model in a seismic domain; and identifying and producing target hydrocarbon reservoirs based on the petro-elastic model. The method may be executed by a computer system.