Patent SG-11201804452P-A (SG)
Title: System and method for correction of seismic receiver clock drift
Inventor: ETGEN JOHN THEODORE
IPC: G01V1/36
Filed: 2016-12-05
Abstract: FOREACH TRACE. ADJUST SEISMIC ARRIVAL. TIMES TO REMOVE LINEAR TIME DRIFT ESTIMATED FOR ITS RECEIVER REPEAT CROSS CORRELATION FOR ALL OTHER SHOTS IN TRACE SECTION STACK CROSS CORRELATIONS 845- - 850 , 855 , PICK CROSS CORRELATIONS TO GET RELATIVE TIME SHEETS (At : ,) 860 ---- INVERT PICKED PAIRIMSE CROSS CORRELATIONS TO GET INDIVIDUAL TRACE CORRECTIONS (At i: At : (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau 111111111111110 III OE III DID III II III DID IIIII H 1111111H (10) International Publication Number WO 2017/105885 Al WIPO I PCT (43) International Publication Date 22 June 2017 (22.06.2017) (71) Applicant: BP CORPORATION NORTH AMERICA INC. [US/US]; 501 Westlake Park Boulevard, Houston, Texas 77079 (US). PCT/US2016/064891 (72) Inventor: ETGEN, John Theodore; 14114 Carolcrest Circle, Houston, Texas 77079 (US). (74) Agent: FALESKI, Thaddeus J.; CONLEY ROSE, P.C., 1001 McKinney, Suite 1800, Houston, Texas 77002 (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, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, (51) International Patent Classification: GO1V 1/36 (2006.01) (21) International Application Number: (22) International Filing Date: 5 December 2016 (05.12.2016) English English (25) Filing Language: (26) Publication Language: (30) Priority Data: 62/269,459 18 December 2015 (18.12.2015) 62/319,860 8 April 2016 (08.04.2016) US US [Continued on next page] (54) Title: SYSTEM AND METHOD FOR CORRECTION OF SEISMIC RECEIVER CLOCK DRIFT (57) : According to one embodiment, there is provided a method of cor- recting recorded seismic data where each receiver clock is potentially inaccurate. Since the seismic wave field is not random, and contains coherent events that are 810-- recorded by all receivers in a local area, it is possible to estimate the differences in the time reference by comparing the recordings of different receivers in a local area. With no external time reference, time signal, or pilot trace, an entire seismic 800 ----C31UT CORRECTION ACQUIRE SEISMIC DATA FOR EACH RECEIVER, ESTIMATE LINEAR TIME DRIFT CORRECTION 815, data itself can be used to determine how each receiver's clock is drifting from true time. APPLY KINEMATIC CORRECTION (NMO!LMO) TO REDUCE IMPACT OF OFFSET VELOCITY VARIATION 830 835 840- SELECT TRACE SECTION CROSS CORRELATE EACH SHOT RECORD WITH >1 PROXIMATE SHOT RECORD W O 20 17 / 105 885 Al 865 ADJUST SEISMIC DATA ARRIVAL. TIMES USING At, REPEAT FOR EACH TRACE SECTION FIG. 7 WO 2017/105885 Al MIDEDIMOMOIDIONOIDEMOMMIREMBHIMMOIMIE 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). Published: — with international search report (Art. 21(3))