油气藏评价与开发
油氣藏評價與開髮
유기장평개여개발
2015年
2期
57-61
,共5页
高精度逆时偏移%实际地震资料%理论模型分析%数值频散关系%高分辨率和信噪比
高精度逆時偏移%實際地震資料%理論模型分析%數值頻散關繫%高分辨率和信譟比
고정도역시편이%실제지진자료%이론모형분석%수치빈산관계%고분변솔화신조비
high precision reverse-time migration%practical seismic data%theoretical model analysis%numerical dispersion analy-sis relation%high resolution and SNR
为了满足松辽盆地中浅层地质目标精细刻画的要求，开展了高精度叠前逆时偏移技术的探索应用研究。首先采用层状介质模型合成了逆时偏移脉冲响应，分析了地震波数值频散现象在不同空间方向的传播效应；接着，采用国际标准的TTI介质模型，开展了不同逆时偏移参数对地震成像结果的影响分析；最后，在松辽盆地PN地区，对高信噪比地震资料进行了高精度逆时偏移处理实践。研究结果表明，逆时偏移参数在纵向上必须满足数值频散关系，而在横向上可以适当放宽数值频散关系的约束，同时，通过提高逆时偏移频率参数，丰富了参与逆时成像的波场信息，从而提高了最终逆时偏移结果的信噪比和纵横向的分辨能力，这在高精度地震资料叠前逆时成像处理和精细地质构造目标刻画等方面具有一定的推广应用价值。
為瞭滿足鬆遼盆地中淺層地質目標精細刻畫的要求，開展瞭高精度疊前逆時偏移技術的探索應用研究。首先採用層狀介質模型閤成瞭逆時偏移脈遲響應，分析瞭地震波數值頻散現象在不同空間方嚮的傳播效應；接著，採用國際標準的TTI介質模型，開展瞭不同逆時偏移參數對地震成像結果的影響分析；最後，在鬆遼盆地PN地區，對高信譟比地震資料進行瞭高精度逆時偏移處理實踐。研究結果錶明，逆時偏移參數在縱嚮上必鬚滿足數值頻散關繫，而在橫嚮上可以適噹放寬數值頻散關繫的約束，同時，通過提高逆時偏移頻率參數，豐富瞭參與逆時成像的波場信息，從而提高瞭最終逆時偏移結果的信譟比和縱橫嚮的分辨能力，這在高精度地震資料疊前逆時成像處理和精細地質構造目標刻畫等方麵具有一定的推廣應用價值。
위료만족송료분지중천층지질목표정세각화적요구，개전료고정도첩전역시편이기술적탐색응용연구。수선채용층상개질모형합성료역시편이맥충향응，분석료지진파수치빈산현상재불동공간방향적전파효응；접착，채용국제표준적TTI개질모형，개전료불동역시편이삼수대지진성상결과적영향분석；최후，재송료분지PN지구，대고신조비지진자료진행료고정도역시편이처리실천。연구결과표명，역시편이삼수재종향상필수만족수치빈산관계，이재횡향상가이괄당방관수치빈산관계적약속，동시，통과제고역시편이빈솔삼수，봉부료삼여역시성상적파장신식，종이제고료최종역시편이결과적신조비화종횡향적분변능력，저재고정도지진자료첩전역시성상처리화정세지질구조목표각화등방면구유일정적추엄응용개치。
In order to meet the requirement of refining geologic target in shallow layer of Songliao Basin, exploring research on high precision pre-stack reverse-time migration technology was carried out. Firstly, the reverse-time migration impulse response with layered medium model was simulated to analyze the seismic wave numerical dispersion phenomena’s propagating effect spread along different spatial directions. Secondly, international standard TTI medium model was used to do the analysis of different re?verse-time migration parameters on the seismic migration results. Finally, the high precision pre-stack reverse-time migration technology was applied in the high SNR seismic data of PN area in Songliao Basin. Results show that, the vertical reverse-time mi?gration parameters must meet numerical dispersion relation, while the horizontal reverse-time migration parameters can be appro?priate to relax the constraint. Meanwhile, the improvement of the frequency parameter can increase the seismic wave field informa?tion involved in reverse time imaging to improve the SNR and resolution of the final reverse-time migration results, which has cer?tain application value in many aspects, such as high precision seismic wave pre-stack reverse-time migration, fine geological struc?ture target characterization, and so on.
