【摘要】：非常規(guī)油氣儲層一般都需要進行壓裂改造才能獲得工業(yè)產(chǎn)能,而巖石脆性指數(shù)測井評價是非常規(guī)油氣儲層壓裂設計中應考慮的重要因素之一。目前國內外關于脆性指數(shù)定義眾多、且計算方法各異,在關于脆性指數(shù)的測井評價方法方面更是缺少一套完整的研究方法流程。本文回顧了油氣儲層脆性指數(shù)的研究歷程,明確了脆性指數(shù)定義的科學內涵,歸納總結了脆性指數(shù)的測井評價方法。最后以鄂爾多斯盆地長7致密油儲層為例,探討了主要的脆性指數(shù)測井評價方法計算流程及其有效性。在有縱、橫波測井資料時,可利用泊-楊法直接計算巖石脆性指數(shù)。同時也可通過元素俘獲測井礦物成分比值法計算脆性指數(shù)。此外基于常規(guī)測井的最優(yōu)化方法確定礦物組分,利用礦物成分比值法也能計算脆性指數(shù)。通過X-射線衍射資料與巖性系數(shù)GR/Pe的回歸擬合建立地區(qū)經(jīng)驗公式,也可實現(xiàn)巖石脆性指數(shù)的測井評價。最后對脆性指數(shù)測井計算中存在的問題進行歸納總結,并對未來發(fā)展方向做出展望。研究成果可為非常規(guī)油氣儲層鉆井和壓裂設計工作提供科學指導。
[Abstract]:In order to obtain industrial productivity, unconventional oil and gas reservoirs usually need fracturing reconstruction, and the evaluation of rock brittleness index logging is one of the important factors that should be considered in fracturing design of unconventional oil and gas reservoirs. At present, there are many definitions of brittleness index at home and abroad, and the calculation methods are different, and there is a lack of a complete research method flow in well logging evaluation of brittleness index. This paper reviews the research history of the brittleness index of oil and gas reservoirs, defines the scientific connotation of the brittleness index, and summarizes the logging evaluation method of the brittleness index. Finally, taking Chang7 tight oil reservoir in Ordos Basin as an example, the calculation flow and validity of main brittleness index logging evaluation methods are discussed. When the longitudinal and shear wave logging data are available, the rock brittleness index can be calculated directly by the Poor-Yang method. The brittleness index can also be calculated by the method of mineral composition ratio of elemental capture logging. In addition, the mineral components can be determined based on the optimization method of conventional logging, and the brittleness index can also be calculated by using the mineral component ratio method. Through the regression fitting of X-ray diffraction data and lithology coefficient GR/Pe, the regional empirical formula can be established, and the log evaluation of rock brittleness index can also be realized. Finally, the problems existing in the calculation of brittleness index logging are summarized, and the future development direction is prospected. The research results can provide scientific guidance for drilling and fracturing design of unconventional oil and gas reservoirs.
【作者單位】： 中國石油大學(北京)地球科學學院;中國石油大學(北京)油氣資源與探測國家重點實驗室;
【基金】：國家科技重大專項(2011ZX05020-008、2016ZX05019-005-007) 國家自然科學基金(41472115)聯(lián)合資助
【分類號】：TE357;P631.81
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本文編號：2288560