【摘要】：本文運用高分辨率層序地層學(xué)、沉積巖石學(xué)等理論,以區(qū)域地質(zhì)、鉆/測井與地震剖面資料分析為基礎(chǔ),綜合巖心、野外剖面資料,通過對新場地區(qū)三疊系須家河組五段單井測井、地震層序分析,確定新場須五段高分辨率等時層序地層格架方案,并將砂體及沉積體系置于層序地層格架內(nèi),以中期旋回為單元研究其時空展布特征,最終建立新場須五段沉積模式,預(yù)測有利儲集相帶,從而為新場須五段儲層勘探開發(fā)提供理論基礎(chǔ)。新場須五段自上而下劃分為1個長期基準面旋回、3個中期基準面旋回,9個短期基準面旋回。3個中期旋回對應(yīng)于上、中、下三個亞段,9個短期旋回對應(yīng)9套砂組。新場須五段基準面旋回層序結(jié)構(gòu)可歸納為三種類型,A類向上“變深”非對稱旋回;B類向上“變淺”非對稱旋回;C類對稱旋回。短期旋回結(jié)構(gòu)具有多樣性,3種旋回結(jié)構(gòu)均發(fā)育,A類多發(fā)育于下亞段,B類多發(fā)育于須五上亞段,C類則多發(fā)育于須五中亞段;中期旋回結(jié)構(gòu)發(fā)育C1型和C2型旋回結(jié)構(gòu),長期旋回僅發(fā)育C1型旋回結(jié)構(gòu),即向上“變深”旋回大于向上“變淺”旋回,反映須五段沉積演化經(jīng)歷了緩慢湖進-快速湖退的過程。結(jié)合測井、巖心、露頭資料對須五段進行相標志分析、測井相及單井相分析,確定新場須家河組五段以淺水湖泊-三角洲沉積體系為特征,劃分出三角洲前緣以及濱淺湖2種沉積亞相,水下分流河道、分流間灣、河口壩及濱淺湖泥、砂泥坪、灘壩等6種沉積微相。選取中期旋回層序為等時地層單元進行沉積相平面展布特征研究,上、下亞段以三角洲前緣河道砂沉積為主,中亞段主要為以粉砂為主的濱淺湖灘壩相。須五段沉積時期的沉積模式為三角洲一湖泊沉積模式,北部西部距物源近,多發(fā)育河道砂,向南水體加深,逐漸相變?yōu)闉I淺湖。綜合須五段沉積相和高產(chǎn)巖性組合分析,水下分流河道為須五段儲層發(fā)育的有利相帶。
[Abstract]:Based on the theories of high resolution sequence stratigraphy and sedimentary petrology, based on the analysis of regional geology, drilling / logging and seismic profile data, the core and field profile data are synthesized in this paper. Based on the single well logging and seismic sequence analysis of the fifth member of Xujiahe formation of Triassic system in Xinchang area, the high resolution isochronous sequence framework scheme of the fifth member of Xinchang formation is determined, and the sand body and sedimentary system are placed in the sequence stratigraphic framework. The spatial and temporal distribution characteristics of Xinchangxiu formation are studied by taking the intermediate cycle as the unit. Finally, the sedimentary model of the five member of Xinchangxiu formation is established, and the favorable reservoir facies zone is predicted, thus providing a theoretical basis for the exploration and development of the reservoir in the fifth member of Xinchangxiu formation. The five segments should be divided from top to bottom into one long-term datum cycle, three medium-term datum cycles, nine short-term base-level cycles, three medium-term cycles corresponding to the upper, middle and lower subsections, and nine short-term cycles corresponding to 9 sets of sand sets. The sequence structure of the five-member base-level cycle in the new field can be divided into three types: type A upward "deepening" asymmetric cycle, category B upward "shallow" asymmetric cycle, and class C symmetric cycle. The structure of short-term cycle is diverse, the three cyclic structures are all developed, A is more developed in the lower submember, B is more in the upper part of Xuzhou, and C is in the middle part of Xuzhou. The middle cycle structure developed C1 type and C2 type cycle structure, while the long term cycle only developed C1 type cycle structure, that is, the upward "deepening" cycle is larger than the upward "shallow" cycle, which reflects that the sedimentary evolution of the fifth member of Xuzhou has experienced the process of slow lacustrine advance and rapid lake regression. Combined with logging, core and outcrop data, facies marker analysis, logging facies and single well facies analysis of Xufive member are carried out. It is determined that the five member of Xinchang Xujiahe formation is characterized by shallow water lacustrine delta sedimentary system. Six sedimentary microfacies, such as delta front and shallow lake, underwater distributary channel, interdistributary bay, estuarine dam and shallow lake mud, sand flat and beach dam, are divided into six sedimentary microfacies. The distribution characteristics of sedimentary facies are studied by selecting the intermediate cyclic sequence as isochronous stratigraphic unit. The upper and lower substrata are mainly composed of delta front channel sand and the middle part is mainly silty shoreline beach and dam facies. The sedimentary model of Xuwu formation is delta-lake sedimentary model. The north west is near to the source of material, the river channel sand is developed, the water body deepens to the south, and the facies is gradually changed into a shore-based shallow lake. According to the analysis of sedimentary facies and high-yield lithology combination of Xuwu formation, the underwater distributary channel is a favorable facies zone for reservoir development of Xuwu formation.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13;P539.2

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