發(fā)布時間：2018-05-14 04:14

  本文選題：交會圖 + 決策樹��； 參考：《石油與天然氣地質》2017年04期

【摘要】：塔河油田奧陶系具有豐富的油氣資源,受巖溶作用影響發(fā)育洞穴、孔洞和裂縫等多種儲集空間,洞穴中充填不同物質。多種儲集空間和充填物組合形成多種縫洞體類型,導致常規(guī)測井響應特征復雜,識別類型難度大。依據露頭、巖心和井壁成像測井等信息,確定了6種縫洞體類型,分別為未充填洞穴型、砂泥充填洞穴型、角礫充填洞穴型、方解石充填洞穴型、縫洞型和裂縫型。結合不同類型縫洞體之間巖性和物性差異,對比分析不同類型縫洞體的雙側向、自然伽馬、聲波、中子、密度測井響應特征及分布規(guī)律。將測井響應兩兩組合建立交會圖,優(yōu)選出9個識別縫洞體類型敏感的測井響應交會圖版,結合決策樹方法,形成逐級識別縫洞體類型方法。應用該方法對塔河油田實際井資料進行處理解釋,識別結果與巖心和錄井對比,符合率均大于85%。該識別方法減少不同類型縫洞體常規(guī)測井響應之間相互混淆的影響,有助于發(fā)揮每個常規(guī)測井響應的作用,提高識別符合率。
[Abstract]:The Ordovician in Tahe Oilfield is rich in oil and gas resources, which is influenced by karstification to develop caves, caverns and fractures, and different materials are filled in the caves. Many types of fractures and cavities are formed by the combination of various reservoir spaces and fillers, which leads to the complexity of the response characteristics of conventional logging and the difficulty of identifying the types. According to the information of outcrop, core and wellbore imaging logging, six types of fracture and cavity body are determined, which are unfilled cave type, sand mud filling cave type, breccia filling cave type, calcite filling cave type, fracture cavity type and so on. Combined with the difference of lithology and physical properties among different types of fracture and cavity bodies, the response characteristics and distribution of dual lateral, natural gamma, acoustic, neutron and density logging of different types of fracture and cavity bodies are analyzed. In this paper, the cross graph of logging response is established, and nine log response cross charts which are sensitive to the type of fracture and cavity body are selected, and the method of identifying fracture and cavity body type step by step is formed by combining the decision tree method. The method is used to process and interpret the actual well data in Tahe Oilfield. The identification results are compared with the core and mud logging, and the coincidence rate is higher than 85%. This method reduces the influence of confusion between the conventional logging responses of different types of fracture-cavity bodies, and helps to play the role of each conventional logging response and improve the recognition coincidence rate.
【作者單位】： 中國石化石油勘探開發(fā)研究院;
【基金】：國家科技重大專項(2016ZX05014-002-001,2017ZX05005-005-005) 中科院先導專項(XDA14010204)
【分類號】：P618.13;P631.81

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