吐哈盆地胜北—红连地区上侏罗统喀拉扎组一段岩相古地理特征

发布时间：2018-03-18 15:21

本文选题：吐哈盆地　切入点：台北凹陷　出处：《成都理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：本论文以吐哈盆地台北凹陷胜北-红连地区上侏罗统喀拉扎组一段作为研究对象,主要通过岩心、钻录井资料、测井资料及地震资料对研究区目的层位进行了沉积学和岩相古地理研究。本文依据测井曲线形态和岩性特征将喀拉扎组一段细分为三个砂组。研究区喀拉扎组一段砂组的物源分析主要通过Dickinsom投点图,碎屑组分特征、岩屑特征、重矿物和粘土矿物等多种方法的综合应用,确定了砂体主要以近南北向展布,发育博格达山和觉罗塔格山两个物源区,没有混源沉积区。对吐哈盆地目的层取心段的典型沉积相标志进行了识别,并且完成了粒度分析,继而系统的研究了台北凹陷胜北-红连地区钻井的测井曲线特征和地震资料响应。研究认为,胜北-红连地区主要发育辫状河三角洲-湖泊沉积体系。建立在岩心相、测井相及地震和粒度分析资料的基础上,在单井沉积相综合柱状图中对各个砂组的沉积相进行了划分,主要发育辫状河三角洲前缘亚相,微相包括水下分流河道、分流间湾、河口坝和远砂坝等。依据多口钻井单井沉积相分析,进而完成了研究区横纵向的连井沉积相剖面对比,表明胜北-红连地区物质供给充分,砂体分布范围广,砂地比值高。在三个砂组中,二砂组砂体最发育,砂岩层厚度最大,粒度最粗。在岩心观察中详细识别了胜北和红连地区岩心中出现的大量软沉积物变形(震积岩),包括液化脉、液化角砾、液化卷曲变形、球-枕状构造、液化均一层、负载构造、纹层卷曲变形、阶梯状微断层、“V”型震裂缝和震裂角砾等变形构造。震积岩集中发育在一、二砂组,震积岩典型构造的累积厚度与连井沉积相剖面中的砂岩层厚度成正比,认为喀拉扎组一段砂组是地震作用的特殊沉积响应,研究区北部构造活动强于南部,表明博格达山在燕山运动Ⅱ幕的再次隆升。通过仔细辨别北部胜北地区和南部红连地区沉积微相和累积砂体厚度的差异性,本文认为,震积岩指示的造山运动控制了胜北-红连地区“南早北晚,北陡南缓”辫状河三角洲沉积体系。作者认为胜北地区发育陡坡辫状河三角洲,红连地区发育缓坡辫状河三角洲。基于对研究区物源体系和喀拉扎组一段各个砂组沉积期的沉积体系研究,最终在吐哈盆地台北凹陷胜北-红连地区建立了相应的沉积模式图。在地层厚度、砂体厚度和砂地比值的数据统计基础之上,限定沉积亚相边界,对三个砂组进行了精细岩相古地理特征分析,结果表明研究区辫状河三角洲前缘的沉积格局没有发生大的转变,沉积演化经历了“湖盆萎缩到扩张”的过程。
[Abstract]:In this paper, the first member of the Upper Jurassic Karazar formation in Shengbei Honglian area, Taibei Sag, Turpan-Hami Basin, is taken as the research object. The sedimentology and lithofacies paleogeography of the target horizon in the study area were studied by logging data and seismic data. According to the logging curve morphology and lithologic characteristics, the first section of the Karazar formation was subdivided into three sand formations. The provenance analysis of the sand formation in the formation is mainly based on the Dickinsom plot. The comprehensive application of various methods, such as clastic composition, lithic characteristics, heavy minerals and clay minerals, has determined that the sand bodies are mainly distributed in the north-south direction, and the two provenances of Bogda Mountain and Jurothagh Mountains are developed. There is no mixed source sedimentary area. The typical sedimentary facies markers of the core member of the target layer in the Turpan-Hami Basin have been identified, and the grain size analysis has been completed. The logging curve characteristics and seismic data response of drilling in Shengbei-Honglian area of Taipei depression are systematically studied. It is considered that the braided river delta-lake sedimentary system is mainly developed in Shengbei Honglian area, which is based on the core facies. On the basis of logging facies and seismic and particle size analysis data, the sedimentary facies of each sand group are divided in single well sedimentary facies comprehensive histogram, mainly developed braided river delta front subfacies, microfacies including underwater distributary channel, distributary bay, etc. Estuarine dam and far sand dam, etc. Based on the sedimentary facies analysis of multiple drilling single wells, the horizontal and longitudinal correlation of the sedimentary facies of the connected well in the study area has been completed. The results show that there is sufficient material supply and a wide distribution of sand bodies in Shengbei-Honglian area. Among the three sand formations, the sand body of the second sand group is the most developed, and the sandstone layer thickness is the largest. In the core observation, a large number of soft sediment deformations in the cores of Shengbei and Honglian areas were identified in detail (seismogenic rocks, including liquefaction veins, liquefaction boulders, liquefaction curls, spherical pillows, liquefaction, and liquefaction. Deformation structures such as load structure, crimp deformation of grain layer, ladder microfault, "V" type earthquake fracture and seismic crack breccia. The seismogenic rocks are concentrated in the first and second sand formations, The cumulative thickness of typical structures of seismite is directly proportional to the thickness of sandstone in the sedimentary facies profile of continuous wells. It is considered that the sand formation of the first member of Karazar formation is a special sedimentary response of earthquake, and the tectonic activity in the northern part of the study area is stronger than that in the south. By carefully distinguishing the difference of sedimentary microfacies and accumulative sand body thickness between the northern Shengbei area and the southern Honglian area, it is suggested that, The orogenic movement indicated by seismogenic rocks controlled the sedimentary system of braided river deltas in Shengbei Honglian area, which is early in the south, gentle in the north and gentle in the north. The authors think that the braided river delta on the steep slope is developed in the area of Shengbei. The braided river delta is developed in Honglian area. Based on the study of the provenance system in the study area and the sedimentary systems of each sand formation in the first member of the Karazar formation, Finally, a corresponding sedimentary model map was established in Shengbei-Honglian area of Taibei Sag, Turpan-Hami Basin. Based on the statistical data of formation thickness, sand body thickness and sand land ratio, the sedimentary subfacies boundary was defined. The fine lithofacies paleogeographic characteristics of three sand formations are analyzed. The results show that the sedimentary pattern of braided river delta front in the study area has not changed greatly, and the sedimentary evolution has experienced the process of "lake basin shrinking to expanding".
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P534.52;P531

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