SG11201806461QA - Method to estimate and remove direct arrivals from arrayed marine sources - Google Patents

Abstract

1 Modeled direct way on active NFH 811 Active NFH data c 803 Adaptive subtraction Modeled direct wave on passive NFH Notional sources 812 -806 8131 815 Adaptive subtraction 801 Active NFH direct data 807 Active NFH reflection data early zero-offset traces Stacking per string Passive NFH reflection data Adaptive subtraction 805 Cross-correlation Optimized stacking 814 Zero-offset trace 1 FIG. 8 Passive NFH data W O 20 17 / 160 424 Al (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date WO 2017/160424 Al 21 September 2017 (21.09.2017) WIPO I PCT 11111111111111011101111111111101011111011101111111111111111110101111111111111110111111 (51) International Patent Classification: GO1V 1/28 (2006.01) GO1V 1/38 (2006.01) GO1V 1/36 (2006.01) (21) International Application Number: PCT/US2017/016972 (22) International Filing Date: 8 February 2017 (08.02.2017) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 62/309,062 16 March 2016 (16.03.2016) US (71) Applicant: EXXONMOBIL UPSTREAM RESEARCH COMPANY [US/US]; Corp-urc-e2.4a.296, 22777 Spring- woods Village Parkway, Spring, TX 77389 (US). (72) Inventors; and (71) Applicants US only): ANDERSON, John, E. [US/US]; 116 Silverstone Lane, Conroe, TX 77384 (US). NORRIS, Michael, W. [US/US]; 12602 Scouts Lane, Cypress, TX 77419 (US). WANG, Haiyang [CN/US]; 10600 Six Pines Drive #631, The Woodlands, TX 77380 (US). CHA, Young, Ho [KR/US]; 12625 Memorial Drive #116, Houston, TX 77024 (US). (74) Agents: WRKICH, Joseph, E. et al.; Exxonmobil Up- stream Research Company, Corp-urc-e2.4a.296, Spring, TX 77389 (US). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Declarations under Rule 4.17: — as to applicant's entitlement to apply for and be granted a patent (Rule 4.17(ii)) [Continued on next page] (54) Title: METHOD TO ESTIMATE AND REMOVE DIRECT ARRIVALS FROM ARRAYED MARINE SOURCES (57) : A method for obtaining zero-offset and near zero offset seismic data from a marine survey, with separation of direct arrival information and reflectivity information, the method including: modeling a direct arrival estimate at a passive near-field hy- drophone array by using a notional source separation on active near-field hydrophone data; generating reflection data for the passive near-field hydrophone array by subtraction of the modeled direct wave from data recorded by the passive near-field hydrophone ar - ray; generating near zero-offset reflectivity traces by stacking the reflection data for the passive near-field hydrophone array on a string-by-string basis or on a combination of strings basis; generating reflectivity information at the active near-field hydrophone ar- ray by subtracting the direct arrival estimate modeled using the notional source separation from the active near-field hydrophone data; and generating an estimate of zero-offset reflectivity traces by calculating a cross-correlation between the between the reflectiv - ity information at the active near-field hydrophone array and the near zero-offset traces and performing an optimized stacking with summation weights based on coefficients of the cross-correlation. WO 2017/160424 All#110HOMOIDEIROIDEDEMIE010111010IMMOVOIS as to the applicant's entitlement to claim the priority of Published: the earlier application (Rule 4.17(iii)) — with international search report (Art. 21(3))