Finally , the convexity - concavity of the closed curve is detected . in the end , choi ' s pair - wise offset of polygon algorithm is improv ed based on the proposed curve intersection algorithm 文章最后完善了choi多邊形等距偏移算法,并把本文提出的封閉曲線(xiàn)求交方法應(yīng)用其中,用于自交點(diǎn)的確定。
The paper , by the real seismic data high fidelity processing with post - stack high precision migration arithmetic and true amplitude in tahe oil filed , summed up a set of post - stack seismic data high fidelity amplitude processing technology to adapt the area reservoir prediction 筆者從塔河油田地震資料高保真處理實(shí)踐中,總結(jié)出了一套適應(yīng)該區(qū)碳酸鹽巖儲(chǔ)層預(yù)測(cè)要求的以疊后高精度偏移算法和振幅保持處理為主的疊后高保真處理技術(shù),取得顯著的效果。
In term of analyzing and summarizing the existing achievement , propose an advanced and practical wavefield extrapolation operator and arithmetic of forward modeling and migration , which obtain numerical simulation and analysis completely and systemically and exploited new field of fractured reservoir seismic wavefield numerical simulation and applicationin in frequency - wavenumber domain 在總結(jié)、分析前人研究成果的基礎(chǔ)上,提出了具有前瞻性和實(shí)用性的波場(chǎng)延拓算子與正演、偏移算法,較系統(tǒng)全面地進(jìn)行了數(shù)值計(jì)算與分析,開(kāi)辟了頻率?波數(shù)域縫洞儲(chǔ)層地震波場(chǎng)數(shù)值模擬與應(yīng)用的新領(lǐng)域。
A hybrid migration method , named " fourier finite - difference migration " , is a post - stack depth migration scheme . the downward extrapolation operator is split into three operators : one operator is a phase - shift operator for a chosen constant background velocity , another operator is the well - known first - order correction term , and the third operator is a finite - difference operator for the varying of the velocity function . phase - shift downward extrapolation and finite - difference downward extrapolation preserves the advantage of phase - shift method and finite - difference method 傅立葉有限差分(簡(jiǎn)稱(chēng)ffd )偏移算法是一種疊后深度偏移算法,其向下延拓算子是一種混合算子,包括三項(xiàng):一項(xiàng)是處理常速的相移算子,一項(xiàng)是一階相移修正算子,最后一項(xiàng)是類(lèi)似45度方程的有限差分算子,用來(lái)處理劇烈橫向變速。