本文選題：超壓成因 + 超壓分布　； 參考：《天然氣地球科學》2017年07期

【摘要】：扶新隆起帶南部青山口組普遍發(fā)育超壓,超壓與源下油氣成藏關系密切。根據錄井、鉆測井及室內分析測試等資料,結合沉積埋藏史及生烴史,對該區(qū)青山口組超壓成因、分布及控制因素進行了研究。結果表明:青山口組超壓主要分布在青一段、青二段,"層控"效應明顯,超壓層測井響應具高聲波時差、低密度、低電阻率的特征;下斜坡區(qū)超壓為欠壓實作用與干酪根生烴作用綜合作用的結果,屬二元成因型超壓,而上斜坡區(qū)超壓則以欠壓實作用為主導,屬單一成因型超壓;單井壓力剖面呈鐘形,自上而下,壓力系數與剩余壓力均呈遞增性變化;縱向上,青二段壓力系數為1.2~1.65,剩余壓力為2.5~9MPa,表現(xiàn)為低—中超壓,青一段壓力系數為1.5~1.85,剩余壓力為4.5~11MPa,表現(xiàn)為中—高超壓,超壓極值分布在青一段;平面上,自長嶺凹陷至扶新隆起帶方向,隨著埋深變淺,超壓強度減弱,下斜坡區(qū)超壓明顯高于上斜坡區(qū),剩余壓力高值中心主要集中在R48井、R39井及R26-1井等井區(qū);青山口組超壓分布呈現(xiàn)較強的非均質性,這種非均質性主要受沉積埋藏速率、暗色泥巖厚度及品質、超壓層埋深和斷層啟閉性等因素控制。超壓特征研究可為扶新隆起帶南部扶余油層油氣成藏認識、蓋層封閉性能評價等提供依據。
[Abstract]:The Qingshankou formation in the south of Fuxin uplift belt is generally overpressure, which is closely related to oil and gas accumulation under the source.Based on the data of logging, drilling logging and laboratory analysis, combined with the history of sedimentary burial and hydrocarbon generation, the causes, distribution and controlling factors of overpressure in Qingshankou formation were studied.The results show that the overpressure of Qingshankou formation is mainly distributed in the first member of Qingyi formation, and the "layer control" effect is obvious. The response of overpressure reservoir is characterized by high sonic time difference, low density and low resistivity.The overpressure in the lower slope is the result of the combination of undercompaction and kerogen hydrocarbon generation. The overpressure in the upper slope is dominated by the undercompaction and belongs to the single genetic overpressure, and the pressure profile of the single well is bell-shaped.In the plane, from Changling depression to Fuxin uplift zone, the overpressure in the lower slope is obviously higher than that in the upper slope with the shallow burying depth and the weakening of the overpressure intensity.The high value center of residual pressure is mainly concentrated in the well areas of well R48, well R39 and well R26-1, and the overpressure distribution of Qingshankou formation shows strong heterogeneity, which is mainly affected by the burial rate of deposition, the thickness and quality of dark mudstone, and so on.The buried depth of overpressure layer and fault opening and closing are controlled.The study of overpressure characteristics can provide a basis for the understanding of oil and gas accumulation in Fuyu reservoir in the south of Fuxin uplift belt and the evaluation of sealing performance of caprock.
【作者單位】： 中國石油大學(華東)地球科學與技術學院;山東省油藏地質重點實驗室;
【基金】：國家科技重大專項(編號:2017ZX05009-001) 中央高�；究蒲袠I(yè)務費專項資金(編號:15CX06012A)聯(lián)合資助
【分類號】：P618.13

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本文編號：1731456