本文選題：直羅組 + 七里鎮(zhèn)砂巖　； 參考：《長安大學》2015年碩士論文

【摘要】：直羅組是李德生于1951年創(chuàng)名于陜西省富縣直羅鎮(zhèn),標準剖面為富縣葫蘆河直羅組剖面,指位于延安組之上、安定組之下的以塊狀長石砂巖和雜色泥巖、粉砂巖為主的粗碎屑巖組合,以富含砂巖為特征。下以一層塊狀中、粗粒長石砂巖與延安組分界,為平行不整合,上以一層灰綠色泥巖夾砂質長石砂巖與安定組分界,為整合接觸。直羅組的研究成果豐富但缺少分類整理,一些基本問題還存有疑問,如七里鎮(zhèn)砂巖的命名地點等問題。通過本次研究,解決了以上問題,并取得相應成果:1.收集了直羅組自創(chuàng)名(1951)以來的多個研究成果,根據(jù)研究程度對資料進行分類,歸納出直羅組的命名、沿革、地質年代、地質特征等方面的材料,選擇直羅組底部七里鎮(zhèn)砂巖、延安組煤線,中部高橋砂巖,頂部安定組底部砂巖為標志層,對直羅組進行劃分�？甲C早期文獻并結合實際資料認為,七里鎮(zhèn)砂巖命名地位于建莊川匯入沮水河處,即現(xiàn)今店頭鎮(zhèn)。2.研究認為直羅組底部以七里鎮(zhèn)砂巖或延安組煤線與延安組分界,頂部以紫紅色巨厚層狀中粒含泥礫長石石英砂巖與安定組為界,內(nèi)部可以劃分為兩個旋回。下旋回起始于劉家砭東側至杜家砭西側結束,下部為黃綠色巨厚層狀含礫中粗粒砂巖,即“七里鎮(zhèn)砂巖”,區(qū)域上分布較為穩(wěn)定,從南向北厚度逐漸變薄,底部常含泥礫,可見到樹干化石;上部為黃綠色泥巖、粉砂巖與黃綠色中層狀砂巖互層。上旋回起始于草子溝至安家川結束,下部巖性為黃綠色塊狀中細粒砂巖,底部含樹干化石;上部為黃綠、藍灰、紫紅等雜色泥巖、粉砂巖夾黃綠色中層狀砂巖。3.研究區(qū)砂巖十分發(fā)育,概率累積曲線與河道亞相相似,結合其它沉積相標志,如沉積構造、古生物特征等,認為研究區(qū)杜家砭附近發(fā)育辮狀河相、草子溝發(fā)育曲流河相和寶塔山附近發(fā)育湖泊相,河流相可進一步劃分為河道亞相和河漫灘亞相,湖泊相主要發(fā)育濱淺湖相。直羅組早期處于半干旱氣候的辮狀河沉積環(huán)境,中期氣候逐漸向炎熱干旱轉變,為曲流河沉積環(huán)境,晚期氣候更加干旱炎熱,在河漫灘上或更低洼處形成小型湖泊。4.直羅組下段巖性主要為中、粗粒含泥礫長石砂巖,長石膠結;孔隙類型有粒間孔隙、溶蝕孔隙等;平均孔隙度56.71%,平均滲透率49.16 x10-3μm2,其儲層主要為IIb類低滲透層。
[Abstract]:The Zhiluo formation was founded in 1951 by Li Desheng in Zhiluo Town, Fuxian County, Shaanxi Province. The standard section is the Hulu River Zhiluo formation section of Fuxian County, which refers to the massive feldspathic sandstone and mixed color mudstone located above the Yan'an formation and under the Anding formation. The coarse clastic rock assemblage of siltstone is characterized by rich sandstone. Under a layer of block, the boundary between coarse feldspar sandstone and Yan'an formation is parallel unconformity, and the upper layer of gray-green mudstone with sandy feldspathic sandstone is integrated contact. The research results of Zhiluo formation are rich but lack of classification, and some basic problems, such as the naming location of sandstone in Qili Town, are still in doubt. Through this research, has solved the above question, and obtained the corresponding achievement: 1. This paper has collected many research results since Zhiluo formation since its inception in 1951), classified the data according to the degree of research, summed up the names, evolution, geological age and geological characteristics of the Zhiluo formation, and selected the sandstone in Qili Town at the bottom of the Zhiluo formation. The Yanan formation coal line, the middle Gaoqiao sandstone, the top Anding formation bottom sandstone as the mark layer, carries on the division to the Zhiluo formation. According to the early literature and actual data, the named place of sandstone in Qili Town is located in Jianzhuang River into Jushui River, that is, Dianshang Town. 2. It is considered that the bottom of Zhiluo formation is separated by Qilizhen sandstone or Yan'an formation coal line and Yan'an formation, and the top of Zhiluo formation is divided into two cycles by fuchsia thick layer medium grained gravel-bearing feldspar quartz sandstone and diazepam formation. The lower cycle started from the east side of Liujiabian to the end of the west side of du Jiabian, and the lower part was the coarse sandstone with yellowish green and very thick layers, that is, the "Qili town sandstone". The distribution in the area was relatively stable, the thickness gradually thinned from south to north, and the bottom often contained mud gravel. The upper part is yellowish green mudstone with siltstone interbedded with yellowish-green mesostratified sandstone. The upper cycle originated from Caozigou to the end of Anjiachuan, the lower lithology was yellowish green block medium fine grained sandstone, the bottom contained trunk fossils, the upper part was yellowish green, blue gray, purple red mixed mudstone, siltstone intercalated yellow green medium layer sandstone. The sandstone is well developed in the study area, and the probability accumulation curve is similar to the channel subfacies. Combined with other sedimentary facies markers, such as sedimentary structure and paleontological characteristics, it is considered that braided river facies are developed near du Jiabian in the study area. The lacustrine facies developed in Caozigou and the lacustrine facies in the vicinity of Baotashan. The fluvial facies can be further divided into channel subfacies and floodplain subfacies, and the lacustrine facies mainly developed shallow-shore lacustrine facies. In the early period of Zhiluo formation, the braided river sedimentary environment was in the semi-arid climate, and the middle climate gradually changed to hot and dry climate. The late climate was more arid and hot, and the small lake .4 was formed on the floodplain or lower lying area. The lithology of the lower member of Zhiluo formation is mainly medium, coarse grained shaly feldspar sandstone, feldspar cementation, pore types such as intergranular pores and dissolution pores, average porosity 56.71 and average permeability 49.16 x 10-3 渭 m2. The reservoir is mainly IIb type low permeability layer.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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