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陜北地區(qū)上三疊統(tǒng)辮狀河心灘微觀特征

2023-04-12 00:00:00徐帥康王鋒

摘 要:鄂爾多斯盆地陜北地區(qū)上三疊統(tǒng)延長(zhǎng)組以辮狀河沉積為主,發(fā)育灰綠色、淺灰綠色砂巖、粉砂巖、灰綠色、淺灰黑色泥巖。為明確陜北地區(qū)辮狀河心灘砂體微觀特征,利用測(cè)井相特征、辮狀河心灘規(guī)模分析心灘類別、發(fā)育特征、夾層類別及夾層分布特征。結(jié)果表明:陜北地區(qū)長(zhǎng)2辮狀河沉積發(fā)育縱向沙壩、橫向沙壩、斜列沙壩3種類型心灘,辨析出心灘主體、灘頭、灘尾、灘翼4部分;心灘內(nèi)部夾層根據(jù)發(fā)育位置分為落淤層、串溝、壩間泥、道壩轉(zhuǎn)換夾層4種類型,落淤層分為縱向落淤層、橫向落淤層、斜列落淤層3種類型;心灘發(fā)育規(guī)模是預(yù)測(cè)落淤層分布的首要因素,對(duì)心灘位置的精準(zhǔn)識(shí)別,結(jié)合心灘長(zhǎng)寬比、寬厚比繪制心灘規(guī)模平面分布模型,預(yù)測(cè)井間落淤層分布特征。辮狀河心灘微觀特征研究是分析辮狀河沉積的首要任務(wù),心灘內(nèi)部夾層發(fā)育特征是影響辮狀河儲(chǔ)層的重要因素,研究成果對(duì)辮狀河心灘砂體特征研究提供借鑒作用。關(guān)鍵詞:心灘構(gòu)型;夾層;落淤層;寬厚比

中圖分類號(hào):TE 121

Microscopic characteristics of braided river bar of Upper Triassic in Northern Shaanxi

XU Shuaikang1,WANG Feng2

(1.College of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China;2.Jingbian Oil Production Plant,Yanchang Oil Field Corporation,Jingbian 718500,China)

Abstract:The Upper Triassic Yanchang Formation in the Qingpingchuan area of the northern Shaanxi slope of the Ordos Basin is dominated by braided river deposits,with grayish green and light grayish green sandstones,siltstones,grayish green and light grayish black mudstones with plant fossils.In order to clarify the microscopic characteristics of braided river bar sand bodies in Qingpingchuan area,the types,development characteristics,interlayer types and interlayer distribution characteristics of the bar are analyzed by using logging facies characteristics,braided river bar scale.The results show that the Chang 2 braided river in Qingpingchuan area developed three types of bar:longitudinal bar,transverse bar and oblique bar,and the four parts of bar body,beach head,beach tail and beach wing can be distinguished.According to the development position,the interlayer in the bar can be divided into four types:silting layer,cross ditch,mud between dams,and channel dam transition interlayer.The silting layer can be divided into three types:longitudinal silting layer,transverse silting layer,and oblique silting layer.And the development scale of the center beach is the primary factor to predict the distribution of the siltation layer.Through the accurate identification of the location of the center beach and the comparison of the length width ratio and the width thickness ratio of the center beach,the plane distribution model of the center beach scale is completed to predict the distribution characteristics of the siltation layer between wells.The research on the microscopic characteristics of braided river bar is the first step to analyze the braided river sand body deposition.The development characteristics of the interlayer in the bar is an important factor affecting the braided river sedimentary reservoir.The research results provide a reference for characterizing the braided river bar sand body.

Key words:bar configuration;interlayer;silting layer;width thickness ratio

0 引 言

前人主要從心灘規(guī)模精細(xì)解剖心灘寬厚比、長(zhǎng)寬比與心灘內(nèi)部夾層分類對(duì)心灘砂體構(gòu)型進(jìn)行研究。王文勝等、楊少春等、劉喜林等、張吉等通過現(xiàn)代辮狀河野外露頭與測(cè)井特征研究水動(dòng)力條件對(duì)心灘各部位粒度發(fā)育特征的影響,橫向上將心灘分為心灘主體、灘頭、灘翼、灘尾4部分[1-4];任燕飛等、陳梁等、王銳、劉鈺銘、張彬等根據(jù)心灘內(nèi)部夾層發(fā)育位置,垂向上將夾層分為落淤層、串溝、壩間夾層、道壩轉(zhuǎn)換夾層4種類型[5-9];于歡、屈偉東等、鄭海妮等采用巖性分類方法將夾層分為泥質(zhì)夾層、鈣質(zhì)夾層2種類型[10-12];陳玉琨等、牛博等認(rèn)為落淤層為心灘內(nèi)部主要夾層,根據(jù)落淤層產(chǎn)狀及平面分布提出近穹窿式、近水平式和單向傾斜式3種類型[13-14];陳薪凱等對(duì)心灘內(nèi)部沉積發(fā)育特征進(jìn)行解剖,按加積作用對(duì)心灘層理影響分出垂向加積、辮狀-曲流轉(zhuǎn)換、偏心半橢球、復(fù)雜構(gòu)型4種心灘模式[15];馬志欣等提出根據(jù)心灘不同部位測(cè)井曲線、發(fā)育模式及沉積特征不同,以測(cè)井響應(yīng)特征、落淤層發(fā)育位置以及垂向微相疊置模式實(shí)現(xiàn)心灘構(gòu)型表征[16]。眾多學(xué)者從定量表征出發(fā),對(duì)心灘及夾層進(jìn)行綜合分析,蘇亞拉圖等、孫天建等基于灰色理論對(duì)辮狀河現(xiàn)代沉積進(jìn)行測(cè)量,采用相控與隨機(jī)建模相結(jié)合方法建立夾層空間分布特征三維地質(zhì)模型[17-18];馬志欣等、范文田等、李海明等、張善義、何宇航等、張占楊通過總結(jié)辮狀河心灘長(zhǎng)寬比、長(zhǎng)厚比、寬厚比來實(shí)現(xiàn)定量表征;范文田等對(duì)心灘的規(guī)模研究與現(xiàn)代辮狀河心灘衛(wèi)星數(shù)據(jù),預(yù)測(cè)心灘長(zhǎng)寬比3∶1~1.6∶1,長(zhǎng)厚比約80∶1~135∶1,寬厚比約60∶1~85∶1,心灘長(zhǎng)度為300~700 m,寬度為240~450 m;何宇航等根據(jù)沉積物理模擬實(shí)驗(yàn),構(gòu)建心灘砂體寬厚比為80~100,長(zhǎng)寬比為1~3的心灘砂體構(gòu)型參數(shù)模型;張善義、張占楊用地質(zhì)學(xué)統(tǒng)計(jì)方法對(duì)辮狀河心灘規(guī)模的野外露頭解剖參數(shù)進(jìn)行線性相關(guān)性分析,確定心灘長(zhǎng)寬比、寬厚比、長(zhǎng)厚比定量關(guān)系[19-24]

1 區(qū)域地質(zhì)特征

鄂爾多斯盆地是中生代大型內(nèi)陸沉積盆地,構(gòu)造上分為北部伊盟隆起、西部西緣逆沖帶及天環(huán)坳陷、南部渭北隆起、東部晉西撓褶帶、中部陜北斜坡6部分。鄂爾多斯盆地晚三疊紀(jì)經(jīng)歷內(nèi)陸湖盆演化的擴(kuò)展—縮小—消亡的水進(jìn)—水退過程,以河流—湖泊三角洲沉積為主。隨著盆地湖水退縮,長(zhǎng)2地層具3個(gè)完整沉積沉積旋回,沉積厚層砂巖的辮狀河沉積,上部一般發(fā)育塊狀灰白色長(zhǎng)石砂巖,下部為3~5 m的深灰色泥巖或粉砂質(zhì)泥巖。

2 心灘類型與發(fā)育特征

2.1 心灘類型

心灘具塊狀層理礫巖相、槽狀(板狀)交錯(cuò)層理砂巖相、平行(水平)層理泥巖相,部分含波紋(水紋)層理;從構(gòu)型要素方面,河道加積作用于心灘底部、垂向加積作用于心灘中上部、上游加積作用于心灘頭部、側(cè)向加積作用于心灘兩翼、順流加積作用于心灘尾部。不同心灘的巖相組合類型不同,劃分為縱向沙壩、橫向沙壩、斜列沙壩列心灘3種。

2.1.1 縱向沙壩

縱向沙壩發(fā)育于辮狀河水動(dòng)力條件較強(qiáng)處,與水流方向相一致,呈菱形或斜方形發(fā)育,以垂向加積為主,層理近水平發(fā)育,中下部以大型槽狀交錯(cuò)層理、板狀交錯(cuò)層理為主,上部發(fā)育平行層理,沉積物粒度較粗,底部可見礫石沉積,具不太明顯的向上變細(xì)的粒序。

2.1.2 橫向沙壩

橫向沙壩發(fā)育于河道變寬或水動(dòng)力突然減弱的弱水流區(qū)域,多呈孤立狀、雁行狀展布,橫向沙壩多種加積作用共同發(fā)育,中部近水平、灘頭陡峭、灘尾平緩。橫向沙壩初始粗粒物質(zhì)垂向加積至平衡狀態(tài),灘頭被上游加積作用沖刷侵蝕,具多組高角度下截型板狀交錯(cuò)層理,后經(jīng)順流加積在灘尾延伸生長(zhǎng),具向上變細(xì)的粒序。

2.1.3 斜列沙壩

斜列沙壩發(fā)育于河道兩側(cè)彎曲、水流流量不對(duì)稱處,橫斷面呈三角形,以側(cè)向加積為主,心灘兩側(cè)水動(dòng)力條件不對(duì)稱,兩側(cè)心灘沉積、侵蝕速度不同,導(dǎo)致呈向弱水動(dòng)力條件一側(cè)遷移,多側(cè)向加積體發(fā)育,侵蝕河岸導(dǎo)致塌落時(shí),易形成板狀交錯(cuò)層理,中下部沉積物粒度較粗時(shí)具不明顯的水平層理和多組底角度下切型板狀交錯(cuò)層理。

2.2 心灘發(fā)育特征

2.2.1 心灘主體

心灘主體位于較為平坦的心灘中部,底部為河道滯留或沙丘疊置形成的河道加積,以粗砂巖-中砂巖為主,多含礫石;中上部以形成砂質(zhì)垂向加積體的垂向加積為主,洪水期以中砂巖沉積為主,低水位期為細(xì)粒沉積,是落淤層等夾層主要發(fā)育部位,底部發(fā)育大型槽狀、板狀交錯(cuò)層理,上部發(fā)育平行層理,測(cè)井曲線呈薄層指狀箱型(圖2(a))或呈微漏斗型(圖2(b))。

2.2.2 灘頭

灘頭位于心灘近物源迎水面位置,以上游加積為主,水流對(duì)心灘頭部進(jìn)行持續(xù)沖刷形成上游加積體,受水流侵蝕后期改造嚴(yán)重沉積序列發(fā)育不完整,落淤層被沖刷近乎不發(fā)育,粒度較粗、分選較好,小型交錯(cuò)層理疊覆于大型交錯(cuò)層理之上,測(cè)井曲線呈微反旋回大型箱型(圖2(b))。

2.2.3 灘翼

灘翼為洪水期在側(cè)向加積作用下向一側(cè)或兩側(cè)進(jìn)行側(cè)積形成的側(cè)向加積體,粒度較細(xì)、易侵蝕,低部位落淤層遭受侵蝕,高部位一般不受影響,粒度體現(xiàn)為先正粒序后反粒序、先反旋回后正旋回的特征,測(cè)井曲線為鐘型(圖2(c))。

2.2.4 灘尾

灘尾為順流加積攜帶細(xì)粒物越過心灘頂部在尾部沉積形成,洪水期水流侵蝕頭部形成的沖刷物也在尾部沉積,沉積物粒度較細(xì),落淤層較易保存,為先反粒序后正粒序、先正旋回后反旋回的特征,測(cè)井曲線為小型鐘型(圖2(c))。

3 心灘夾層特征

夾層是位于單砂體內(nèi)部的相對(duì)低滲透率或非滲透率巖層,多由泥巖、粉砂質(zhì)泥巖及鈣質(zhì)砂巖組成,根據(jù)巖性組成及物性特征分為泥質(zhì)夾層、物性夾層、巖性夾層3種類型。根據(jù)夾層發(fā)育位置分為落淤層、串溝、壩間泥、道壩轉(zhuǎn)換夾層4種類型。

3.1 夾層類型

落淤層是心灘內(nèi)部重要夾層,發(fā)育于平水期心灘主體部位,因水動(dòng)力條件減弱細(xì)粒物質(zhì)沉積,未被下一期水流徹底沖刷侵蝕形成,落淤層展布受心灘的展布范圍及后期水流沖刷影響,根據(jù)心灘的3種類型將落淤層分為縱向落淤層、橫向落淤層、斜列落淤層3種類型。

縱向落淤層近水平分布,多期之間互相平行。縱向沙壩水動(dòng)力條件較強(qiáng),落淤層易侵蝕,兩側(cè)不對(duì)稱,受心灘分布影響落淤層范圍自下而上逐漸縮小;橫向落淤層近水平對(duì)稱分布,多期落淤層之間近平行(圖3(a))。橫向沙壩比縱向沙壩水動(dòng)力條件較弱,以垂向加積為主,兩側(cè)水動(dòng)力條件相近,單期落淤層對(duì)稱分布,分布范圍從壩頭至壩尾逐漸增大,受橫向沙壩發(fā)育影響,橫向落淤層分布范圍較廣,前端有明顯坡度(圖3(b));斜列落淤層傾向水流方向傾斜分布,多期落淤層向弱水動(dòng)力一側(cè)間隔增大。強(qiáng)水動(dòng)力條件一側(cè)受水流沖刷侵蝕嚴(yán)重,落淤層被后期侵蝕,多呈向一側(cè)傾斜分布,在被侵蝕一側(cè)易出現(xiàn)多期疊置分布(圖3(c))。

3.2 夾層特征

落淤層、串溝、壩間泥、道壩轉(zhuǎn)換夾層與Miall界面分級(jí)的3級(jí)界面相伴生,受后期沖刷侵蝕作用影響,心灘內(nèi)部夾層難以保留,導(dǎo)致夾層分布范圍隨機(jī)性大、不穩(wěn)定。

落淤層發(fā)育于心灘砂體中后部,平面上落淤層為平水期在灘頭后部靜水區(qū)沉積的細(xì)粒物質(zhì),多以泥巖、粉砂質(zhì)泥巖、泥質(zhì)粉砂巖沉積的塊狀層理為主,粒度與周圍相比逐漸變細(xì),垂向上落淤層位于不同期次增生體之間,界面可見明顯沖刷現(xiàn)象含泥礫,上下巖性變化明顯,測(cè)井曲線GR值明顯增大,呈指狀。

范文田對(duì)西藏拉薩河現(xiàn)代心灘沉積進(jìn)行觀測(cè)總結(jié)心灘長(zhǎng)寬比為1.4~2.4[20];何宇航通過對(duì)洪水期、平水期、枯水期的心灘進(jìn)行分類,得出長(zhǎng)寬比1.8~2.7,寬厚比74~95[23];何宇在蘇格里氣田176個(gè)樣本中求出心灘長(zhǎng)寬比1.96,寬厚比87.6(表1)[25]

落淤層分布以心灘發(fā)育規(guī)模為基礎(chǔ),心灘發(fā)育近平行分布落淤層,垂直水流方向禹142井心灘上部疊置辮狀河道沉積位于心灘側(cè)翼,后兩期落淤層受水流侵蝕在禹213,禹142井間尖滅,禹216,禹214井心灘測(cè)井曲線呈箱型、漏斗型,位于心灘主體部位(圖4);順?biāo)鞣较蛴?33,禹232井測(cè)井曲線呈箱型,粒度分選較好,位于灘頭受上游加積作用后兩期落淤層被水流沖刷剝蝕,禹212,禹130井測(cè)井曲線呈鐘型位于灘尾,受心灘發(fā)育特征影響前兩期落淤層間隔變小,未沉積第3期落淤層(圖5)。根據(jù)表1前人對(duì)辮狀河心灘發(fā)育規(guī)模的研究鉆井鉆遇心灘厚度,認(rèn)為陜北地區(qū)辮狀河心灘寬厚比1∶45,長(zhǎng)厚比1∶60。

4 心灘砂體平面分布模式

鄂爾多斯盆地延長(zhǎng)組以河流-湖泊沉積為主,長(zhǎng)2地層發(fā)育3個(gè)沉積旋回,陜北地區(qū)位于陜北斜坡盆地內(nèi)部構(gòu)造不發(fā)育、傾角小,地層變化、沉積環(huán)境較為穩(wěn)定,沉積作用差異不大,發(fā)育地層40~150 m厚度基本相近,砂巖呈灰綠色、淺灰綠色、泥巖為灰綠色、淺灰黑色,泥巖中見植物莖干、植物碎片,粉砂巖層面少見云母碎片,表現(xiàn)為弱氧化-弱還原條件下的陸上沉積環(huán)境,發(fā)育槽狀交錯(cuò)層理、板狀交錯(cuò)層理及平行層理,尤以平行層理較為發(fā)育,主要發(fā)育河流相辮狀河沉積。

陜北地區(qū)發(fā)育縱向沙壩、橫向沙壩、斜列沙壩共計(jì)7個(gè)心灘,心灘厚度依次為20,18,15,12,25,17,18 m,結(jié)合陜北地區(qū)辮狀河心灘寬厚比、長(zhǎng)寬比公式依次可知心灘規(guī)模為1 200 m×900 m(長(zhǎng)×寬);1 000 m×550 m(長(zhǎng)×寬);800 m×500 m(長(zhǎng)×寬);800 m×400 m(長(zhǎng)×寬);1 200 m×1 000 m(長(zhǎng)×寬);1 100 m×600 m(長(zhǎng)×寬);900 m×600 m(長(zhǎng)×寬),由此預(yù)測(cè)心灘內(nèi)部落淤層展布方向和分布范圍(圖6)。

5 結(jié) 論

1)陜北地區(qū)長(zhǎng)2地層發(fā)育3個(gè)沉積旋回,為弱氧化-弱還原河流相辮狀河沉積。

2)陜北地區(qū)辮狀河發(fā)育縱向沙壩、橫向沙壩、斜列沙壩3種類型心灘,根據(jù)心灘內(nèi)部砂體加積模式及發(fā)育位置辨析出心灘主體、灘頭、灘尾、灘翼4部分。

3)提出了陜北地區(qū)辮狀河心灘寬厚比、長(zhǎng)寬比對(duì)心灘規(guī)模的影響與控制作用。

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(責(zé)任編輯:李克永)

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