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PERMFILE50081
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PERMFILE50081
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Last modified
8/24/2016 10:54:48 PM
Creation date
11/20/2007 2:19:00 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1999002
IBM Index Class Name
Permit File
Doc Date
6/19/1999
Doc Name
OBJECTORS EXHIBITS
Media Type
D
Archive
No
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re .?: <br />x <br />es-.F <br />to <br />n <br />:; <br />ve :;,: <br />of <br />nd <br />;a-..,, <br />on ~? <br />ss :' <br />I y.. r"" <br />ce-.; <br />~- <br />me <= <br />oral - <br />rich t- <br />tra- <br />rdi-_ '= <br />and <br />are <br />leaf, - <br />~lt ?'; <br />mi- <br />'ard ' <br />not ' <br />;colt <br />+osi- <br />xsi- <br />~edi- <br />3D <br />.p of <br />1 er- <br />' on <br />.p o[ <br />e4 Of <br />I data -' <br />fugal <br />ough <br />intcr- <br />ng it <br />few- <br />ation <br />lions <br />~cess- <br />for to <br />.till in <br />t h er <br />Weans <br />es in <br />?d on <br />e!ocity <br />m the <br />,~?c in <br />Building Klock approach <br />In effect, toll-volume 3D PSDDI cul- <br />minates abuilding block process in <br />which basic processing and interpreta- <br />tion steps taken in the time domain <br />contribute to construction of the veloc- <br />ity model and work as quality control <br />checks at each stage. <br />Derivation of an accurate velocit}- <br />model depends on strategic location. <br />aad tight spacing of Velocity control <br />points. Normal 3D seismic processing <br />conducts a Velocity analysis ever}' 1-2 <br />km. In 3D PSDM processing, velecity <br />analyis. should occur every 500 m or <br />less. <br />The aim is to produce a velvcity <br />field in time. Before picking velocities, <br />the geophysicist should nrn a simple <br />time migration of the stacked aelovily~ <br />r a,,, <br />F'~g 3 <br />This is an unusual step that ran he <br />crucial to quality ccntrol. Cln unn~- <br />grated data, diffractions keep the ve- <br />locity interpreter from fo:nring a clear <br />geologic concept o(th? top of .;alt (Fig. <br />3a). <br />1`(igmiion o; the stacked velocity <br />lines provides an image of the top of <br />salt in time that the interpreter can <br />apply late; in death iFig. 36). This is <br />esser.hally an r.rh auality control <br />step thn: r+iil save rime and money b}' <br />reducing the number of costly, Gme- <br />aansuming iterations ^ecessaq at the <br />3D PSU\f stage. <br />q clear image of the top and base of <br />soh, ar,d to some anent sut•sal: ret,co- <br />lions, ir. time Yelps the interpreter <br />pick associated vekaiGes daring ve <br />loiitt' c.nahas. In Fig. 4, veiuatr`[`al~? <br />p!oh.n against the hor'ventr.: <br />Fig. 4 <br />two-rcav travel time against the verti- <br />cal scale. <br />In areas of no sal', velocities are <br />easy to p'ck (Fig. 4a). That's not the <br />case rchere salt intnrdes in the sedi- <br />ments. ('-ig. 461. <br />Unul the last couple of years, time <br />int?mre!ers would ignore velocity <br />picks at the bas? o(salt, assuming coat <br />the indi;ations were out-of-plane re- <br />flections or anomalies. They would go <br />strai•_ht to velxiiy picks in s?dimects <br />belerc salt, which is rvh}' ~nterprnta- <br />tion_ nursed the base of salt and often <br />assumed that calf extenc'~ed io indefi- <br />nite depth. - <br />Another basic tool that helps at lids <br />sta~~ is the slack panel, ut which <br />sea'?rat traces ever an area are stacked <br />at ~ary'ing velCC{ties to see which .e- <br />loci5_s rernoce normal movenut wr- <br />e <br /> <br />
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