【文章內(nèi)容簡介】 的 T0時間 3) 震源本身能監(jiān)控震源的狀態(tài) 4）能記錄震源的震動性能信號 (參考、力、重錘、平板） 5) 電臺通訊 (儀器與震源 ,震源與震源間 ) 6) 對現(xiàn)場處理要求高 ISS(Independent Simultaneous Sources)獨立震源工作模式 i 運算速度快 ii 大的存儲空間 iii 處理系統(tǒng)有數(shù)據(jù)分離和三維 FKK濾波等模塊 、并且模塊算法適合處理大的數(shù)據(jù)量 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 ?Flip Flop交替掃描 ?Slip Sweep滑動掃描 ?DSSS(Distance Separated Slip Sweep )滑動 +距離分開 ?ISS(Independent Simultaneous Sources)獨立震源工作模式 ?HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 提 綱 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 HFVS 是 Exxon Mobil 的一項專利技術(shù)，這項技術(shù)要求記錄未相關(guān)的的原始數(shù)據(jù)每臺震源的每次掃描的震動信號。之所以稱之高保真因為在數(shù)據(jù)分離過程中用到了震源的力信號。 High Fidelity Vibratory Seismic HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 ? Increase Productivity（高效率）： Reduce acquisition time by recording more than one Vibrator at a time Requirement for increased productivity particularly on high density wide azimuth surveys ? Resolution提高分辨率：點激發(fā)、點接收 There is no arrays, point source – receiver techniques Processing records as unique source points allows for correction of intraarray statics and differential velocity moveout which wouldn’t be possible with conventional r ecording where vibrator arrays are summed in the field. ? Correlate the ground force with vibrator data用地面力信號替代參考信號 ? Denser geometries lead to finer spatial sampling高密度空間采樣 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 240米 4 臺震源 /組 6個檢波器堆放 地下界面 HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 線性升頻掃描： 696Hz 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 Vib 1 sweep1 Vib 2 sweep1 Vib 3 sweep1 Vib 4 sweep1 Record 1 Vib 1 sweep2 Vib 2 sweep2 Vib 3 sweep2 Vib 4 sweep2 Record 2 Vib 1 sweep3 Vib 2 sweep3 Vib 3 sweep3 Vib 4 sweep3 Record 3 Vib 1 sweep4 Vib 2 sweep4 Vib 3 sweep4 Vib 4 sweep4 Record 4 1 x HFVS 記錄 HFVS 掃描過程中每臺震源的相位編排 Vibrator Vib 1 Vib 2 Vib 3 Vib 4 Sweep Phase in degree Phase in degree Phase in degree Phase in degree 1 180 81 60 353 2 81 180 353 60 3 60 353 180 81 4 353 60 81 180 240m HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 實時的相位變換 1 2 3 4 Vibrator no Sweep no Phase QC 180 81 60 353 Sweep phase HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 HFVS 數(shù)據(jù)采集的關(guān)鍵點 ? 震次至少與震源的臺數(shù)一樣多 ? 記錄震源力信號并應(yīng)用于數(shù)據(jù)分離 ? 為了提高數(shù)據(jù)分離效果，每次掃描每臺震源要進行相位編排（ it helps reduce harmonic noise） ? 為了降低震源間相互干擾，震源間應(yīng)分開一段距離 (min distance should be in 200 – 300 m) HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 4 FDU 1 LAUR 1 LRU DSD Recorder Sercel 428 AHVIV Vibrator HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 通過無線采集方式記錄震源力信號 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 Record each auxiliary channel of 4 vibrators, total 20 auxiliary channels need to be QCed V1 V2 V3 V4 Vib 1 2 3 4 DPG reference sweep DSD return reference sweep Ground Force Signal Reaction Mass Acc Signal Baseplate Acc Signal Uncorrelated HFVS raw field record HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 HFVS data inversion amp。 seperation ?In time domain data (D) is a convolution of the earth response (E) with Source Signature (S) ?In the frequency domain we can write this as a Matrix as given below ????????????????????????????????????????????????????????????????MNMNMMNNNNDDDDDEEESSSSSSSSSSSSSSS4321212144241332312222111211If the sweeps are repeated at least the same number of times as the number of vibrators then the earth response for each vibrator can be separated by inverting a matrix of vibrator signatures in the frequency domain and applying the resultant filter to the geophone data. HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 HFVS raw data inversion, separation 29s 1 sweep of 4 vibs vibrating simultaneously uncorrelated raw record Vib 1, sweep 1 Vib 2, sweep 1 Vib 3, sweep 1 Vib 4, sweep 1 + Vib 1, sweep 2 Vib 1, sweep 3 Vib 1, sweep 4 + + Generate separated , inverted amp。 stacked raw records for each vibrators HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 Shot line Receiver line Shot line Receiver line 2 fleets x 4 Vibrators (240m apart) 4 sweeps per VP Crews further apart possibly to avoid cross contamination Active patch HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 23 Receiver lines First fleet 32 VPs / line Second fleet 32 VPs / line 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23Shot lines Shot lines 240m HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 231 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 231 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 231 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23Swath 1 Swath 2 Swath 3 Moving 8 receiver lines between two swaths HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 1 2 3 4 5 6 7 8 …………23 vib interval :240m 23 RL receiving V1 V2 V3 V4 4vib*4sweeps Always select the V1’s source number to push the shoot button, every one push,4 vib will shake 4 times at same time HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 1 2 3 4 5 6 7 8 …………23V1 V2 V3 V4 240 m 240 m 30 m HFVS(High Fidelity Vibratory Seismic)基于高保真技術(shù)的高效采集 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 HFVS 現(xiàn)場處理 Conventional 3D : 20M / VP HFVS 3D: 3680 channels 28 s raw data 1500 VPs / day Size: 200M / VP Total: 300G / day Recorder: 6 NAS disks (360G/each) QC: Disk Array (20 T) IBM disk array 采集技術(shù)支持部內(nèi)部技術(shù)交流材料 The following