二连盆地乌尼特坳陷阿拉达布斯凹陷南洼槽地层与沉积相特征研究

发布时间：2018-03-24 13:51

本文选题：阿拉达布斯凹陷南洼槽　切入点：地层特征　出处：《西北大学》2015年硕士论文

【摘要】：阿拉达布斯凹陷南洼槽位于二连盆地东北部,主体为一个东断西超的箕状断陷。该区南洼槽为延长石油(集团)油气勘探公司在二连盆地勘探开发的新区块。目前,本区已完成11条二维地震测线,完钻一口参数井,勘探程度较低。据重、磁、电勘探成果,通过前期二维地震资料证实,整个凹陷分为南、北两个洼槽,洼槽结构完整,理论上具备油气生、运、聚的基本条件。结合邻区高力罕凹陷、布日敦凹陷等勘探开发的相关资料,理论上预测阿拉达布斯凹陷具有较好的勘探前景。但从2013年部署的参数井——延阿参1井钻探结果来看,无论地层特征、岩性特征、含油气情况、烃源岩发育及沉积相特征,均与目前对该凹陷主流认识有较大差异,急需开展该区沉积地层及沉积相特征研究,以期为研究区下一步勘探部署提供必要的地质理论依据。本文主要通过地震资料的解释及邻区对比,结合延阿参1井钻探分析结果,开展研究区地层及沉积相特征研究。研究表明：阿拉达布斯凹陷形成于拉张的构造背景下,断层沿北东-南西向发育,垂向上表现为叠合单断型半地堑凹陷构造；阿拉达布斯凹陷南洼槽地层自下而上依次为：中生界下白垩统阿尔善组、腾格尔组(腾一段、腾二段)、赛汉塔拉组以及新生界。阿尔善组地层沉积厚度最大地区位于东界控凹断层的下降盘；岩性以滨浅湖环境下沉积的泥质粉砂岩、粉砂质泥岩、泥岩为主；测井曲线特征为低伽马,高声波,高电阻；孢粉组合为刺毛孢-原始松柏粉-二连粉组合。腾一段地层厚度最大达到750m,研究区北部沉积中心有所扩大；岩性以辫状河三角洲前缘环境下沉积的砂砾岩为主；测井曲线特征为低伽马,低声波,电阻变化小；孢粉组合为广口粉-云杉粉-松粉。腾二段地层厚度最大达700m,沉积中心主要位于东界断层的下降盘附近；岩性以砾状砂岩和砂砾岩为主；测井曲线特征为伽马变化小,声波在上部变化大,下部变化小,低电阻；孢粉以云杉粉-松粉-松柏粉-雏囊粉组合带为特征。赛汉塔拉组岩性主要为灰色泥岩、砾状砂岩粗砂岩以及少量灰黑色薄层碳质泥岩,另见7段黑色煤层；测井曲线特征为伽马变化幅度小,声波时差呈锯齿状变化,在煤层处表现为高声波时差；孢粉组合为克拉梭粉属-松粉组合。阿拉达布斯凹陷物源主要来自湖盆周缘的白音呼硕凸起和巴其凸起,研究区划分为三角洲相、湖泊相、水下扇3个大相,并细分出4个亚相11个微相,各沉积相在每个沉积期都有发育。阿尔善时期凹陷处于快速成湖期,湖盆范围逐渐变大,发育浅湖亚相沉积,主要呈现浅湖砂坝、浅湖泥夹砂和浅湖泥频繁互层的现象,该时期断层相对不发育；腾格尔组腾一段是凹陷主要成湖期,湖盆面积扩大,断层活动性增强,对沉积控制作用明显；腾二段断层持续发育,湖盆面积有所减小,对凹陷的控制作用依然明显,腾格尔组时期主要发育辫状河三角洲前缘亚相沉积：赛汉塔拉组时期构造活动基本结束,断层不发育,沉积方式主要由断陷式沉积转化为以坳陷式沉积为主的一个大的沉积凹陷,凹陷内普遍接受沉积,地形起伏减小,此后凹陷及周围整体抬升,遭受剥蚀。新生代,在喜山运动的作用下,研究区再次抬升,接受了由泛滥平原、河流等相的陆源碎屑沉积。第四纪,研究区进入风成砂、风成粘土沉积期。
[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.

【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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