【摘要】：三肇凹陷是松遼盆地重要的油氣富集區(qū),為大慶油田的穩(wěn)產(chǎn)做出了巨大貢獻,而扶余油層作為油氣產(chǎn)能的接替層位,對它的勘探評價顯得日益重要。目前扶余油層具有探明儲量動用率低、鉆井成功率低的特點,造成這種狀況的主要原因是對扶余油層的沉積特征及成藏規(guī)律了解不夠明確,論文針對此勘探現(xiàn)狀,選取三肇凹陷州401區(qū)塊作為研究區(qū),在全面收集區(qū)內(nèi)測井、錄井、巖心、試油、三維地震等資料的基礎(chǔ)上,對構(gòu)造特征、沉積特征、構(gòu)造演化特征、油氣運聚規(guī)律及成藏模式等進行深入剖析,取得的主要成果如下:(1)通過對鉆井、測井及地震等資料的分析研究,結(jié)合區(qū)域地質(zhì)情況及前人研究成果,將研究區(qū)扶余油層劃分為5個短期旋回,分別對應(yīng)FⅢ、FⅡ、FⅠ3、FⅠ2、FⅠ1油層組。(2)通過三維地震精細解釋,刻畫了三肇凹陷內(nèi)T2張性斷裂系統(tǒng)的平、剖面特征,并根據(jù)扶余油層各油層組的底、頂面構(gòu)造特征分析其沉積充填特征,從而明確了扶余油層的構(gòu)造沉積演化特征。(3)通過對測井相、巖心相及地震相的分析,對扶余油層各油層組的沉積相展布及沉積環(huán)境進行研究,并利用波阻抗反演的方法對各油層組的砂體分布狀況進行預(yù)測,明確了FⅢ、FⅡ、FⅠ3、FⅠ2油層組主要發(fā)育淺水三角洲平原亞相沉積,FⅠ1油層組主要發(fā)育三角洲前緣亞相沉積,分流河道的發(fā)育對于砂體的展布起著明顯的控制作用。(4)通過對構(gòu)造演化特征、構(gòu)造變形特征、斷層活動特征及各成藏事件的綜合分析,揭示了構(gòu)造演化對成藏的控制作用,確定扶余油層成藏的關(guān)鍵時期為嫩江組末期和明水組末期,并對各期油氣運聚規(guī)律進行深入分析,闡明了油藏動態(tài)變化過程。(5)通過對嫩江組末期及明水組末期成藏特征及油藏動態(tài)變化規(guī)律的分析,深入探討不同斷層在不同時期對成藏所起到的作用,揭示了斷層對成藏的控制作用。并將斷層分為兩類,即繼承性發(fā)育的大規(guī)模斷層和僅發(fā)育于T2軸附近的小規(guī)模斷層。大規(guī)模斷層在嫩江組末期對成藏起到促進作用,在明水組末期起到一定的破壞作用;小規(guī)模斷層在兩個成藏關(guān)鍵時期均起到促進作用,因此確定小規(guī)模斷層為利于扶余油層成藏的“有利斷層”。(6)通過對扶余油層成藏條件、油水分布規(guī)律、動態(tài)成藏過程的研究,建立了3種成藏模式:地壘式成藏、階梯式成藏及地塹式成藏。并結(jié)合“有利斷層”研究成果,識別出3類油氣富集區(qū),最終預(yù)測出有利成藏區(qū)。
[Abstract]:Sanzhao depression is an important oil and gas accumulation area in Songliao Basin, which has made a great contribution to the stable production of Daqing Oilfield. As a replacement of oil and gas productivity, Fuyu reservoir is becoming increasingly important for its exploration and evaluation. At present, Fuyu reservoir has the characteristics of low proven reserve production rate and low drilling success rate. The main reason for this situation is that the sedimentary characteristics and reservoir forming rules of Fuyu reservoir are not clear enough. Selecting Block 401 of Sanzhao Sag as the study area, on the basis of collecting the data of logging, core, oil testing and 3D earthquake, the structural characteristics, sedimentary characteristics and structural evolution characteristics are analyzed. The main results obtained are as follows: (1) through the analysis of drilling, logging and seismic data, combined with regional geological conditions and previous research results, The Fuyu oil layers in the study area are divided into five short-term cycles corresponding to the F 鈪，

本文編號：2256946