【摘要】：以克拉瑪依油田一中區(qū)為例,綜合現(xiàn)代沉積、巖芯、露頭、密井網(wǎng)等資料,應用層次分析法深入解剖干旱型沖積扇內(nèi)部構(gòu)型。以沖積扇相帶劃分為基礎(chǔ),構(gòu)建7~9級構(gòu)型要素分級體系,明確構(gòu)型要素的成因、規(guī)模及樣式,建立精細的干旱型沖積扇構(gòu)型模式。研究表明:①根據(jù)巖性組合、沉積構(gòu)造等特征將沖積扇依次劃分為槽流、片流、辮流及徑流4個相帶;②槽流帶主體為寬帶狀槽流沉積體,由多期槽流礫石體垂向疊置而成,單期槽流礫石體頂部在間洪期受到小股牽引流侵蝕改造,發(fā)育網(wǎng)狀的流溝系統(tǒng);③片流帶主體為扇狀片流砂礫體,由多期片流朵體側(cè)向—垂向復合而成,朵體頂部披覆的泥質(zhì)夾層是穩(wěn)定的滲流屏障;④辮流帶主體為寬帶狀辮流水道,由洪水水道和間洪水道兩種單一水道側(cè)向復合而成,洪水水道規(guī)模較大、側(cè)向遷移頻繁、切割疊置關(guān)系復雜、物性較好,在油田注水開發(fā)過程中極易形成水竄通道,而間洪水道規(guī)模較小,側(cè)向切疊程度較低、物性也較差;⑤徑流帶主體為漫流細粒沉積,在漫流細粒沉積的背景上發(fā)育徑流水道,其水道規(guī)模小、物性差且易尖滅。
[Abstract]:Taking the first middle area of Karamay oilfield as an example, the internal configuration of arid alluvial fan is deeply dissected by analytic hierarchy process (AHP) by synthesizing the data of modern sedimentation, core, outcrop and dense well pattern. Based on the classification of alluvial fan facies, the classification system of 7 ~ (9) grade structural elements was constructed, and the formation, scale and style of the structural elements were clarified, and a fine configuration model of arid type alluvial fan was established. The results show that: 1 according to the lithologic assemblage, sedimentary structure and other characteristics, the alluvial fan can be divided into four facies zones: trough flow, slice flow, braided flow and runoff; (2) the main body of the trough flow zone is a broad-band trough flow sedimentary body, which is formed by vertical superposition of the multi-stage trough flow gravel body. The top of the single-stage trough flow gravel body is modified by small tug flow erosion during the interval flood period, and a net-like trench system is developed. The main body of the flow zone is fan-flow sand gravel, which is composed of multi-stage flake flow body sideways and vertical direction, and the muddy interlayer at the top of the flower body is a stable seepage barrier. (4) the main body of the braided flow zone is a broad-band braided channel, which is composed of two single watercourses, flood channel and interflow channel. The flood channel is large in scale, frequent in lateral migration, complicated in cutting superposition, and good in physical properties. It is easy to form water channeling channel in the process of oilfield water injection development, but the scale of interflow flood channel is smaller, the lateral tangent degree is lower, and the physical property is also poor. (5) the main body of the runoff zone is the diffuse fine grain deposition. The runoff channel is developed on the background of the diffuse fine grain deposition. The runoff channel is small in scale, poor in physical properties and easy to be destroyed.
【作者單位】： 中國石油大學(北京)油氣資源與探測國家重點實驗室;中國石油大學(北京)地球科學學院;長江大學計算機科學學院;中海石油(中國)有限公司天津分公司;
【基金】：國家自然科學基金資助項目(編號:41372116) 國家重大科技專項(編號:2011ZX05009-003)的成果~~
【分類號】：P618.13

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