天然气工业
天然氣工業
천연기공업
NATURAL GASINDUSTRY
2009年
12期
29-31
,共3页
李煜伟%李砚%吕宗刚%岳宏%彭海润%包吉山
李煜偉%李硯%呂宗剛%嶽宏%彭海潤%包吉山
리욱위%리연%려종강%악굉%팽해윤%포길산
介质%数学模型%瞬时频率%频谱%振幅%天然气%地震勘探%预测
介質%數學模型%瞬時頻率%頻譜%振幅%天然氣%地震勘探%預測
개질%수학모형%순시빈솔%빈보%진폭%천연기%지진감탐%예측
medium%mathematical model%instantaneous frequency%spectrum%amplitude%natural gas%seismic exploration%prediction
单相介质理论针对固体而忽视流体,预测油气则先天不足.双相介质理论指出流体尤其是油气的存在和运动是弹性波频散和衰减的主要原因,因而可以通过计算频散谱和衰减谱来预测油气.谱的计算要求有瞬时特性,才能避免时窗效应.为此采用分频的办法对地震道进行分频,形成分频道集后再作"三瞬"处理,这样在指定时刻一个釆样点可集合成瞬时振幅谱、瞬时频率谱、瞬时相位谱;用瞬时振幅谱和瞬时频率谱计算出瞬时衰减谱,而瞬时频散谱则可用瞬时相位谱去近似代表.通过已知井建立预测模型,再对6个待钻井位目标用该方法进行预测,完井试油预测成功率达83.33%.
單相介質理論針對固體而忽視流體,預測油氣則先天不足.雙相介質理論指齣流體尤其是油氣的存在和運動是彈性波頻散和衰減的主要原因,因而可以通過計算頻散譜和衰減譜來預測油氣.譜的計算要求有瞬時特性,纔能避免時窗效應.為此採用分頻的辦法對地震道進行分頻,形成分頻道集後再作"三瞬"處理,這樣在指定時刻一箇釆樣點可集閤成瞬時振幅譜、瞬時頻率譜、瞬時相位譜;用瞬時振幅譜和瞬時頻率譜計算齣瞬時衰減譜,而瞬時頻散譜則可用瞬時相位譜去近似代錶.通過已知井建立預測模型,再對6箇待鑽井位目標用該方法進行預測,完井試油預測成功率達83.33%.
단상개질이론침대고체이홀시류체,예측유기칙선천불족.쌍상개질이론지출류체우기시유기적존재화운동시탄성파빈산화쇠감적주요원인,인이가이통과계산빈산보화쇠감보래예측유기.보적계산요구유순시특성,재능피면시창효응.위차채용분빈적판법대지진도진행분빈,형성분빈도집후재작"삼순"처리,저양재지정시각일개변양점가집합성순시진폭보、순시빈솔보、순시상위보;용순시진폭보화순시빈솔보계산출순시쇠감보,이순시빈산보칙가용순시상위보거근사대표.통과이지정건립예측모형,재대6개대찬정위목표용해방법진행예측,완정시유예측성공솔체83.33%.
The single phase theory is inefficient in hydrocarbon detection because it only studies solid without considering the fluids it contains. In contrast, two-phase medium theory suggests that the existence and movement of fluids, especially hydrocarbons, are the main cause of dispersion and attenuation of elastic waves, making it possible to detect hydrocarbons through calculating dispersion spectrum and attenuation spectrum. The calculation of spectrum needs instantaneity to avoid time window effect. Seismic traces are processed through frequency division and the frequency-division gathers are further processed to obtain instantaneous amplitude spectrum, instantaneous frequency spectrum and instantaneous phase spectrum on one sampling point at a given time. The instantaneous amplitude spectrum and frequency spectrum are then used to calculate instantaneous attenuation spectrum, while the instantaneous phase spectrum can be used as an approximation to instantaneous dispersion spectrum. The prediction model based on the available well data was used to identify targets of six planned wells, and up to 83.33% of the prediction results were in coincidence with the formation testing results.