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Seismic characteristics of two deep-...

Lu, Shaoming.

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Seismic characteristics of two deep-water drilling hazards: Shallow-water flow sands and gas hydrate.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Seismic characteristics of two deep-water drilling hazards: Shallow-water flow sands and gas hydrate./
作者:	Lu, Shaoming.
面頁冊數:	115 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3153.
Contained By:	Dissertation Abstracts International64-07B.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3098544

Seismic characteristics of two deep-water drilling hazards: Shallow-water flow sands and gas hydrate.
Lu, Shaoming.

Seismic characteristics of two deep-water drilling hazards: Shallow-water flow sands and gas hydrate. - 115 p.

Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3153.

Thesis (Ph.D.)--The University of Texas at Dallas, 2003.

A 3D simultaneous Amplitude Variation with Angle (AVA) Inversion is applied to three common-angle aperture prestack time migrated 3D data volumes from the Garden Banks area of the Gulf of Mexico, to obtain a seismic compressional to shear velocity (Vp/Vs) ratio volume. With constraints and calibrations from two wells, high Vp/Vs anomalies (>9) inverted from conventional seismic data are used to identify potential shallow water flow (SWF) sands away from the wells. The results show that V p/Vs values are more diagnostic than seismic amplitudes alone for SWF sand detection. Elastic seismic amplitude variation with angle data provide unreliable indicators where SWF sands are thin (where interference occurs between reflections from the layer tops and bottoms) or if viscoelasticity is significant.Subjects--Topical Terms:

535228
Geophysics.

Seismic characteristics of two deep-water drilling hazards: Shallow-water flow sands and gas hydrate.
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100 1 $a Lu, Shaoming. $3 1953501
245 1 0 $a Seismic characteristics of two deep-water drilling hazards: Shallow-water flow sands and gas hydrate.
300 $a 115 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3153.
500 $a Supervisor: George A. McMechan.
502 $a Thesis (Ph.D.)--The University of Texas at Dallas, 2003.
520 $a A 3D simultaneous Amplitude Variation with Angle (AVA) Inversion is applied to three common-angle aperture prestack time migrated 3D data volumes from the Garden Banks area of the Gulf of Mexico, to obtain a seismic compressional to shear velocity (Vp/Vs) ratio volume. With constraints and calibrations from two wells, high Vp/Vs anomalies (>9) inverted from conventional seismic data are used to identify potential shallow water flow (SWF) sands away from the wells. The results show that V p/Vs values are more diagnostic than seismic amplitudes alone for SWF sand detection. Elastic seismic amplitude variation with angle data provide unreliable indicators where SWF sands are thin (where interference occurs between reflections from the layer tops and bottoms) or if viscoelasticity is significant.
520 $a A new approach based on empirical relations provides cost-effective estimates of the saturation, concentration and distribution of gas hydrate and free-gas away from the control wells. The water-filled porosity is calibrated to acoustic impedance twice; one calibration is used where gas hydrate is present, and the other, where free-gas is present. The water-filled porosity is then used to estimate gas hydrate or free-gas saturations. The method is first developed and evaluated using well logs from Ocean Drilling Program (ODP) Leg 164 from the Blake Ridge area off the east coast of North America, and then applied to a single channel seismic line from that area. The results match well with other independent estimations.
520 $a An elastic impedance inversion is applied to four time-migrated common-angle aperture (CAA) data sets. Two new algorithms are developed and evaluated using well-log data from ODP Leg 164 to estimate P-impedance and S-impedance from the elastic impedance. The Vs/Vp ratio, Poisson's ratio, and Lame parameter terms lambdarho and lambda/mu are estimated from the P-impedance and S-impedance. The results show that the hydrated sediments have high elastic impedance, high P-impedance, high S-impedance, high lambdarho, slightly higher Vs/Vp ratio, slightly lower Poisson's ratio and slightly lower lambda/mu values compared to those of the surrounding unhydrated sediments. The sediments containing free-gas have low elastic impedance, low P-impedance, non-anomalous background S-impedance, high Vs/Vp ratio, low Poisson's ratio, low lambdarho, and low lambda/mu values.
590 $a School code: 0382.
650 4 $a Geophysics. $3 535228
650 4 $a Engineering, Petroleum. $3 1018448
690 $a 0373
690 $a 0765
710 2 0 $a The University of Texas at Dallas. $3 1018411
773 0 $t Dissertation Abstracts International $g 64-07B.
790 1 0 $a McMechan, George A., $e advisor
790 $a 0382
791 $a Ph.D.
792 $a 2003
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