本文選題：阿拉達布斯凹陷南洼槽　切入點：地層特征　出處：《西北大學》2015年碩士論文

【摘要】：阿拉達布斯凹陷南洼槽位于二連盆地東北部,主體為一個東斷西超的箕狀斷陷。該區(qū)南洼槽為延長石油(集團)油氣勘探公司在二連盆地勘探開發(fā)的新區(qū)塊。目前,本區(qū)已完成11條二維地震測線,完鉆一口參數(shù)井,勘探程度較低。據(jù)重、磁、電勘探成果,通過前期二維地震資料證實,整個凹陷分為南、北兩個洼槽,洼槽結構完整,理論上具備油氣生、運、聚的基本條件。結合鄰區(qū)高力罕凹陷、布日敦凹陷等勘探開發(fā)的相關資料,理論上預測阿拉達布斯凹陷具有較好的勘探前景。但從2013年部署的參數(shù)井——延阿參1井鉆探結果來看,無論地層特征、巖性特征、含油氣情況、烴源巖發(fā)育及沉積相特征,均與目前對該凹陷主流認識有較大差異,急需開展該區(qū)沉積地層及沉積相特征研究,以期為研究區(qū)下一步勘探部署提供必要的地質理論依據(jù)。本文主要通過地震資料的解釋及鄰區(qū)對比,結合延阿參1井鉆探分析結果,開展研究區(qū)地層及沉積相特征研究。研究表明：阿拉達布斯凹陷形成于拉張的構造背景下,斷層沿北東-南西向發(fā)育,垂向上表現(xiàn)為疊合單斷型半地塹凹陷構造；阿拉達布斯凹陷南洼槽地層自下而上依次為：中生界下白堊統(tǒng)阿爾善組、騰格爾組(騰一段、騰二段)、賽漢塔拉組以及新生界。阿爾善組地層沉積厚度最大地區(qū)位于東界控凹斷層的下降盤；巖性以濱淺湖環(huán)境下沉積的泥質粉砂巖、粉砂質泥巖、泥巖為主；測井曲線特征為低伽馬,高聲波,高電阻；孢粉組合為刺毛孢-原始松柏粉-二連粉組合。騰一段地層厚度最大達到750m,研究區(qū)北部沉積中心有所擴大；巖性以辮狀河三角洲前緣環(huán)境下沉積的砂礫巖為主；測井曲線特征為低伽馬,低聲波,電阻變化小；孢粉組合為廣口粉-云杉粉-松粉。騰二段地層厚度最大達700m,沉積中心主要位于東界斷層的下降盤附近；巖性以礫狀砂巖和砂礫巖為主；測井曲線特征為伽馬變化小,聲波在上部變化大,下部變化小,低電阻；孢粉以云杉粉-松粉-松柏粉-雛囊粉組合帶為特征。賽漢塔拉組巖性主要為灰色泥巖、礫狀砂巖粗砂巖以及少量灰黑色薄層碳質泥巖,另見7段黑色煤層；測井曲線特征為伽馬變化幅度小,聲波時差呈鋸齒狀變化,在煤層處表現(xiàn)為高聲波時差；孢粉組合為克拉梭粉屬-松粉組合。阿拉達布斯凹陷物源主要來自湖盆周緣的白音呼碩凸起和巴其凸起,研究區(qū)劃分為三角洲相、湖泊相、水下扇3個大相,并細分出4個亞相11個微相,各沉積相在每個沉積期都有發(fā)育。阿爾善時期凹陷處于快速成湖期,湖盆范圍逐漸變大,發(fā)育淺湖亞相沉積,主要呈現(xiàn)淺湖砂壩、淺湖泥夾砂和淺湖泥頻繁互層的現(xiàn)象,該時期斷層相對不發(fā)育；騰格爾組騰一段是凹陷主要成湖期,湖盆面積擴大,斷層活動性增強,對沉積控制作用明顯；騰二段斷層持續(xù)發(fā)育,湖盆面積有所減小,對凹陷的控制作用依然明顯,騰格爾組時期主要發(fā)育辮狀河三角洲前緣亞相沉積：賽漢塔拉組時期構造活動基本結束,斷層不發(fā)育,沉積方式主要由斷陷式沉積轉化為以坳陷式沉積為主的一個大的沉積凹陷,凹陷內普遍接受沉積,地形起伏減小,此后凹陷及周圍整體抬升,遭受剝蝕。新生代,在喜山運動的作用下,研究區(qū)再次抬升,接受了由泛濫平原、河流等相的陸源碎屑沉積。第四紀,研究區(qū)進入風成砂、風成粘土沉積期。
[Abstract]:Arada booth in the South trough is located at two northeast of Erlian Basin, the main is an east west fault over the half graben. The southern trough is Yanchang Petroleum (Group) oil and gas exploration company in two even the exploration and development of new block basin. At present, the zone has completed 11 2-D seismic lines end, drill a parameter well, the low degree of exploration. According to weight, magnetic, electric exploration results, through the 2D seismic data confirmed that the depression is divided into South and north two trough, trough structural integrity, theory with oil and gas, transportation, basic conditions. Combined with the adjacent area high poly Abraham depression, Buridun sag and the exploration and development of relevant information, the theoretically predicted arada booth sag has a good exploration prospect. But from 2013 deployment parameters of well extended Assam 1 well drilling results, regardless of stratigraphic characteristics, lithologic features, hydrocarbon source rocks, the development and the characteristics of sedimentary facies with the There are great differences on the understanding of the urgent need to carry out major depression, sedimentary strata and sedimentary facies study, in order to study next provide necessary theoretical basis for geological exploration deployment. This thesis compares the interpretation of seismic data and its adjacent areas, with the extension of a 1 well drilling parameter analysis results, and carry out formation study on the characteristics of depositional phase. The study shows that the formation of extensional tectonic background of the arada booth to sag, fault development along the NE-SW, show vertical superposition of single fault tectonic half graben sag; southern sag sag arada strata from booth as follows: Mesozoic Cretaceous Arxan (a group, Ten Geer Go Teng Teng two, section), and the formation of Cenozoic. Downthrow Arxan sedimentary thickness maximum area is located in the eastern boundary of the depression controlled fault lithology; shallow lake sedimentary environment Argillaceous siltstone, silty mudstone, mudstone; logging curves for low gamma, high waves, high resistance to bristle spore pollen assemblages; - Virgin powder - two powder combination. Even a proton formation thickness up to 750m, the northern part of the study area has been expanded to lithology sedimentary center; glutenite sedimentary front the environment of the Braided River Delta; logging curves for low gamma, low wave resistance, small changes; sporopollen assemblage is a wide mouth powder powder and loose powder. Spruce Teng two strata thickness is up to 700m, drop plate near the main sedimentary center is located in the east boundary fault; lithology rudaceous sandstone and sandstone; logging curves for gamma small change in the upper lower acoustic changes, small changes, low resistance; pollen powder to spruce pine powder - Pine powder powder combined with young cystic features. Formation lithology is mainly grey mudstone, gravel sand Rock coarse sandstone and a little thin black carbonaceous mudstone, see 7 black coal seam; logging curves for gamma little change, sonic jagged changes in coal seam showed high sonic; pollen assemblages for CLASSOPOLLIS genera - loose powder combination. Baiyin arada sag source mainly from the booth the periphery of the basin called large bulge and Pakistan the bulge, lake research area is divided into delta facies, facies, underwater fan 3 facies, and subdivided into 4 subfacies and 11 microfacies, the sedimentary facies in each sedimentary period are developed. The Arxan period of depression in the fast lake, lake basin range becomes larger, the development of shallow lake facies, mainly showing shallow lake sandbar, shallow lake mud sand and shallow lake mud interbedded frequently, the fault period relatively undeveloped; Teng Ko Erh is a group of Teng sag mainly into the lake, the lake area expanded, fault activity enhancement, Control of deposition obviously; Teng two fault development, the lake area decreased, still there is an obvious control effect on depression, in Teng Ko Erh group mainly developed braided river delta front subfacies: tectonic formation period basically ended, the faults are not developed, mainly by sedimentary rift type deposition into a large deposit in the depression type deposits in the sag sag, generally accepted deposition, the terrain is reduced, then the depression and surrounding uplift and denudation. In the Cenozoic, the Himalayan movement under the action of the study area again lifted, accepted by the flood plain, clastic sedimentary facies of the river. In the study area, the wind into the sand, the aeolian clay deposits.

【學位授予單位】：西北大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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