本文選題：前積反射 + 湖盆充填�。� 參考：《西北大學》2015年碩士論文

【摘要】：近年來隨著鄂爾多斯盆地黃土塬地區(qū)地震資料品質的不斷提高,在地震剖面上顯示出了許多延長組湖盆地層學和沉積學方面的重要信息。其中延長組不同方向大型前積反射指示的斜交前積充填過程可以較好的解釋了湖盆中心長7重力流砂體的來源和分布等成因。本文綜合了地震和鉆井資料,在合成記錄層位標定和地震資料精細解釋的基礎上,探討了鄂爾多斯盆地延長組湖盆充填模式以及其對長7-長6致密儲層控制作用,建立了不同組合類型致密砂體測井相模式,通過測井響應、地震正演、地震反演、屬性分析等多種手段開展了致密儲層的識別與預測,并取得了以下幾點認識：1、延長組湖盆并不是像鉆井分層那樣“千層餅”式的加積充填的,而是由來自不同方向和坡度的長7-長6、長7-長4+5或長7-長3時期大型三角洲-重力流斜交前積充填的。長7致密砂體主要來自西南陡坡長6-長3時期的三角洲滑塌重力流成因。2、通過建立研究區(qū)致密砂巖的含油性解釋標準,確定了致密砂巖的物性、含油性、巖性和電性等參數(shù),分析了致密砂體的分布、測井相類型、儲源組合等特征。3、砂體正演結果表明,長7低速頁巖上發(fā)育一套或多套砂體,在地震剖面上,長7底強振幅之上會出現(xiàn)一個中弱振幅,致密砂體厚度與振幅強弱成正比。4、疊后自然伽馬可以區(qū)分出致密砂巖與泥巖,密度反演小于2.56g/cm3砂體可能為致密油。在井約束條件下,通過疊后自然伽馬反演與疊后密度反演相結合的方法,可以較好的預測致密儲層。
[Abstract]:In recent years, with the continuous improvement of the quality of seismic data in the Loess Plateau area of Ordos Basin, many important information on stratigraphy and sedimentology of the lake basin of Yanchang formation have been shown on the seismic profile. The process of oblique forward filling indicated by large forward reflection in different directions of Yanchang formation can explain the origin and distribution of gravity flow sand body of Chang 7 in the center of the lake basin. In this paper, the seismic and drilling data are synthesized, and on the basis of the calibration of synthetic record horizon and the fine interpretation of seismic data, the filling model of lake basin of Yanchang formation in Ordos Basin and its controlling effect on the tight reservoir of Chang7-Chang6 formation are discussed. The logging facies models of different types of compact sand bodies are established, and the identification and prediction of tight reservoirs are carried out by logging response, seismic forward modeling, seismic inversion, attribute analysis and so on. And we have gained the following understanding: the Yanchang formation lake basin is not a "thousand layer cake" type of accretion filling like drilling stratification. Instead, it is filled with large delta gravity flow oblique forward deposits from different directions and slopes in the period of 7- Chang 6, Chang 7 Chang 45 or long 7 Chang 3. The dense sand body of Chang 7 is mainly derived from the origin of the delta slump gravity flow in the period of Chang 6-3 in the southwest steep slope. By establishing the interpretation standard of the oil content of the dense sandstone in the study area, the physical properties, oil content, lithology and electrical properties of the dense sandstone are determined. The distribution of tight sand bodies, the type of logging facies and the combination of reservoir and source are analyzed. The forward modeling results of sand bodies show that one or more sets of sand bodies are developed on Chang7 low speed shale. In seismic profile, there will be a middle and weak amplitude above the strong amplitude at bottom of Chang 7. The thickness of compact sand body is proportional to the amplitude of sand body. The natural gamma ray can distinguish dense sandstone from mudstone. The inversion of density is smaller than that of 2.56g/cm3 sand body, which may be a tight oil. Under the condition of well constraint, the method of combining natural gamma inversion with post-stack density inversion can be used to predict the tight reservoir.
【學位授予單位】：西北大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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