【摘要】：本論文以川南-黔北地區(qū)下志留統(tǒng)龍馬溪組富有機(jī)質(zhì)泥頁(yè)巖段作為研究對(duì)象,在前人研究成果的基礎(chǔ)上,搜集研究區(qū)內(nèi)有關(guān)下志留統(tǒng)龍馬溪組相關(guān)的地質(zhì)資料,結(jié)合野外地質(zhì)調(diào)查以及鉆井巖芯的觀察,對(duì)川南-黔北地區(qū)區(qū)域地質(zhì)背景、沉積相、有機(jī)地化特征、富有機(jī)質(zhì)泥頁(yè)巖的厚度、埋深、脆性礦物含量、物性特征、含氣性特征以及保存條件等幾個(gè)重要條件進(jìn)行分析,得出:沉降中心宜賓-瀘州-合江-綦江等地區(qū)下志留統(tǒng)龍馬溪組富有機(jī)質(zhì)泥頁(yè)巖的有機(jī)碳含量普遍大于5%,有機(jī)碳含量自沉降中心分別向北靠近川中隆起、向南靠近黔中隆起有機(jī)碳含量逐漸降低。深水陸棚區(qū)域內(nèi)富有機(jī)質(zhì)泥頁(yè)巖有機(jī)碳含量較高;干酪根類型以I型、II1型為主,有機(jī)質(zhì)成熟度在2.0%~3.3%之間;靠近隆起處為淺水陸棚沉積環(huán)境,有機(jī)碳含量較低普遍小于2%,干酪根類型以I型、II1型為主含部分II1型,有機(jī)質(zhì)成熟度在1.0%~2.0%。川南-黔北地區(qū)下志留統(tǒng)龍馬溪組富有機(jī)質(zhì)泥頁(yè)巖主要為海相沉積,分布穩(wěn)定。區(qū)內(nèi)在沉降中心宜賓-瀘州-合江-綦江等地區(qū)富有機(jī)質(zhì)泥頁(yè)巖的厚度最大,可達(dá)百米以上,向北至自貢-內(nèi)江-大足等地區(qū),富有機(jī)質(zhì)泥頁(yè)巖的厚度降至60m左右,到達(dá)川中隆起富有機(jī)質(zhì)泥頁(yè)巖消失。向南至長(zhǎng)寧-綦江等地區(qū),富有機(jī)質(zhì)泥頁(yè)巖的厚度降至80m左右,至筠連-敘永-道真等地區(qū),富有機(jī)質(zhì)泥頁(yè)巖的厚度降至60m,至威信-古藺-習(xí)水-正安等地區(qū),富有機(jī)質(zhì)泥頁(yè)巖的厚度降至40m左右,而靠近黔中隆起富有機(jī)質(zhì)泥頁(yè)巖的厚度逐漸消失。研究區(qū)內(nèi)除靠近川中隆起與黔中隆起附近均具備成為頁(yè)巖氣有利區(qū)的條件。川南-黔北地區(qū)下志留統(tǒng)龍馬溪組埋深主要分布在553~5000m,在沉降中心宜賓-瀘州-合江-綦江附近埋深相對(duì)較深,在3000~4500m之間;在習(xí)水-正安附近埋深相對(duì)較淺,主要集中在1000~2000m,在黔中隆起附近威信、敘永、仁懷等地區(qū),埋深降至1000~1500m;埋深有利區(qū)主要分布在威遠(yuǎn)-自貢-內(nèi)江、長(zhǎng)寧-興文等地區(qū),埋深集中在1500~3500m。川南-黔北地區(qū)下志留統(tǒng)龍馬溪組富有機(jī)質(zhì)泥頁(yè)巖的礦物組成以脆性礦物為主,次為碎屑礦物及粘土礦物,石英、長(zhǎng)石含量在34%~90%之間,平均為51.1%;碳酸鹽礦物含量較少,在0~53%之間,平均為16.95%;縱向上龍馬溪組自下而上脆性礦物含量逐漸降低,粘土礦物略顯升高。研究區(qū)內(nèi)下志留統(tǒng)龍馬溪組富有機(jī)質(zhì)泥頁(yè)巖脆性礦物含量較高,具備良好的壓裂潛力。川南-黔北地區(qū)下志留統(tǒng)龍馬溪組富有機(jī)質(zhì)泥頁(yè)巖孔隙度在1.5%~10.1%之間,平均為4.16%;滲透率主要分布在0.0014×10-3~0.52×10-3μm2之間,平均滲透率為0.028×10-3μm2;孔喉直徑主要分布在20~110nm;儲(chǔ)集空間類型主要包括孔隙以及微裂縫兩種,孔隙類型主要包括礦物顆粒間(晶間)微孔縫、礦物顆粒溶蝕微孔隙、有機(jī)質(zhì)生烴形成的微孔隙以及基質(zhì)溶蝕孔隙等。據(jù)長(zhǎng)寧地區(qū)搜集的鉆井資料可知,下志留統(tǒng)龍馬溪組有300m左右的富有機(jī)質(zhì)泥頁(yè)巖,含氣量在0.5~6.5m3/t之間,在2363~2396m之間含氣量在3.5~6.5m3/t(威遠(yuǎn)僅2.8m3/t);道頁(yè)1井在553~597m之間,現(xiàn)場(chǎng)含氣性解析同樣顯示較好,總含氣量在1.84~2.69m3/t之間,與Ohio、New Albany相近。通過與北美地區(qū)頁(yè)巖氣藏富集條件對(duì)比,研究區(qū)內(nèi)下志留統(tǒng)龍馬溪組具有良好的頁(yè)巖氣勘探潛力。川南-黔北地區(qū)有利區(qū)的分布主要是以沉降中心宜賓-瀘州-合江-綦江等地區(qū)為中心,向北至威遠(yuǎn)-榮縣-內(nèi)江等地區(qū);向南至筠連-威信-古藺-習(xí)水-道真等地區(qū)。遠(yuǎn)景區(qū)主要分布在靠近川中隆起以及黔中隆起附近。
[Abstract]:In this paper, the Lower Silurian Longmaxi Formation rich in organic mudstone and shale in the southern Sichuan-northern Guizhou area is taken as the research object. On the basis of previous research results, the related geological data of Lower Silurian Longmaxi Formation in the study area are collected. Combined with field geological survey and drilling core observation, the regional geological background of the Southern Sichuan-northern Guizhou area is studied. Based on the analysis of sedimentary facies, organic geochemical characteristics, thickness, burial depth, brittle mineral content, physical characteristics, gas-bearing characteristics and preservation conditions, it is concluded that the organic carbon content of Lower Silurian Longmaxi Formation organic shale is generally more than 5% in Yibin-Luzhou-Hejiang-Qijiang sedimentation center. The organic carbon content of organic shale in deep-water shelf area is higher than that in central Guizhou uplift area; kerogen type is type I, type II1, and organic matter maturity is between 2.0% and 3.3%; near the uplift area is shallow shelf sedimentary environment, organic carbon content is higher. The organic matter maturity is 1.0%~2.0%. Lower Silurian Longmaxi Formation organic mudstone is mainly marine sedimentary, and its distribution is stable. From north to Zigong-Neijiang-Dazu and other areas, the thickness of organic mudstone shale is reduced to about 60 m, and the organic mudstone shale disappears in the central Sichuan uplift. At 60 m, the thickness of organic-rich mudstone shale decreased to about 40 m in Weixin-Gulin-Xishui-Zheng'an area, while the thickness of organic-rich mudstone shale gradually disappeared near the central Guizhou uplift. The burial depth is mainly distributed in 553-5000 m, and is relatively deep in the vicinity of Yibin-Luzhou-Hejiang-Qijiang River, which is between 3000-4500 M. The burial depth is relatively shallow near Xishui-Zheng'an, mainly concentrated in 1000-2000m, near Weixin, Xuyong, Renhuai and other areas in the central Guizhou uplift, and the burial depth is reduced to 1000-1500m. The burial depth of the Lower Silurian Longmaxi Formation in the Gong-Neijiang and Changning-Xingwen areas is 1500-3500 M. The mineral composition of the Lower Silurian Longmaxi Formation is mainly brittle minerals, followed by clastic minerals and clay minerals. The quartz and feldspar contents range from 34% to 90%, with an average of 51.1%; the carbonate minerals are less, ranging from 0% to 53%, with an average of 1.1%. The content of brittle minerals in Lower Silurian Longmaxi Formation is relatively high and has good fracturing potential. The porosity of Lower Silurian Longmaxi Formation is between 1.5% and 10.1%. The average permeability is 4.16%; the average permeability is 0.0014 0.52 6550 According to the drilling data collected in Changning area, the Lower Silurian Longmaxi Formation has about 300 m organic shale with gas content of 0.5-6.5m3/t, and gas content of 3.5-6.5m3/t between 2363-2396 m (Weiyuan only 2.8 m3/t), and Daoyao 1 well with gas content of 553-597 M. Compared with the enrichment conditions of shale gas reservoirs in North America, the Lower Silurian Longmaxi Formation in the study area has good shale gas exploration potential. As the center, north to Weiyuan-Rongxian-Neijiang and other areas; south to Yunlian-Weixin-Gulin-Xishui-Daozhen and other areas.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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