本文選題：大孔道　切入點：扇三角洲前緣　出處：《東北石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：長期注水開發(fā)作用下,高含水油田油層受到注水不同程度的沖刷作用,導(dǎo)致儲層孔滲性發(fā)生一定程度變化。部分井層受水洗破壞嚴(yán)重,形成大孔道,從而造成注入水的無效循環(huán),使儲層非均質(zhì)程度加劇,嚴(yán)重影響儲層內(nèi)部剩余油的挖潛。研究大孔道識別方法及大孔道分布規(guī)律對高含水期油田的剩余油挖潛具有重要意義。本文主要以曙266區(qū)塊杜家臺油層組為例,在沉積學(xué)、開發(fā)地質(zhì)學(xué)、油層物理學(xué)等理論指導(dǎo)下,首先研究了研究區(qū)目的層的主要地質(zhì)特征,曙266區(qū)塊屬于構(gòu)造-巖性油氣藏,目的層杜家臺油層組主要屬于扇三角洲前緣沉積,巖石類型以巖屑質(zhì)長石砂巖和長石質(zhì)巖屑砂巖為主。膠結(jié)物含量較低,以泥質(zhì)膠結(jié)為主,巖石相對疏松。研究了本區(qū)塊大孔道的識別特征。在動態(tài)資料上,吸水百分?jǐn)?shù)遠(yuǎn)大于臨層的井層、隨時間增加單層注水百分?jǐn)?shù)持續(xù)增加的井層、含水率在某一時間突然增高的井層等均指示大孔道的存在;在測井曲線上則表現(xiàn)為自然電位幅度值、聲波時差值升高、井徑擴大,電阻率曲線出現(xiàn)幅度值和幅度差下降等。建立了測井資料解釋滲透率、孔隙度、平均孔喉半徑等參數(shù)的模型,利用聚類分析和判別分析確定了大孔道的五級分類劃分方法,從I到V級,大孔道性質(zhì)變差。最后在分析大孔道形成條件的基礎(chǔ)上,研究了大孔道的分布規(guī)律,I類大孔道首先最易于出現(xiàn)在厚層水下分流河道中下部,或非河道砂中部核心位置;II、III類大孔道分布較為廣泛,包括河道中部、寬闊的席狀砂內(nèi)部,IV、V類大孔道多分布在河道砂、席狀砂邊緣、分流間灣及狹窄的席狀砂內(nèi)部。
[Abstract]:Under the action of water injection for a long time, the reservoir in high water cut oil field is scoured by water injection to different degrees, which leads to the change of reservoir porosity and permeability to a certain extent. As a result, the invalid circulation of injected water is caused, and the heterogeneity of reservoir is aggravated. It is very important to study the method of large pore channel identification and the distribution law of large pore channel to exploit the remaining oil potential in high water-cut oil field. This paper mainly takes Dujiatai formation of Shu266 block as an example in sedimentology. Under the guidance of development geology, reservoir physics and other theories, the main geological characteristics of the target layer in the study area are studied. The Shu266 block belongs to the tectonic-lithologic reservoir, and the Dujiatai reservoir formation of the target layer mainly belongs to the fan delta front sedimentation. The main rock types are lithic feldspathic sandstone and feldspathic lithic sandstone. The content of cementation is relatively low, and the muddy cementation is dominant, and the rock is relatively loose. The percentage of water absorption is much larger than that of the adjacent layer, and the layer with the increase of single-layer water injection percentage continuously increases with time, and the wells with a sudden increase in water cut at a certain time all indicate the existence of a large pore channel. On the log curve, the amplitude of natural potential, the difference of acoustic time, the enlargement of well diameter, the amplitude of resistivity curve and the decrease of amplitude difference are shown. The interpretation permeability and porosity of logging data are established. Based on the model of average pore throat radius and other parameters, the five-level classification and division method of large channels is determined by cluster analysis and discriminant analysis. The properties of large channels become worse from I to V. Finally, based on the analysis of the formation conditions of large channels, In this paper, the distribution of large channels is studied. First of all, large channels of type I are most likely to appear in the middle and lower part of a thick underwater distributary channel, or in the core of non-channel sand center. The distribution of large channels of type III is relatively extensive, including the middle part of the channel. The wide table-shaped sand interior with IVV type macroporous channel is distributed in channel sand, sheet sand edge, distributary bay and narrow sheet sand interior.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13
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本文編號：1584492