本文選題：構(gòu)造演化 + 大隆組頁�。� 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：本文以四川盆地上二疊統(tǒng)大隆組富有機(jī)質(zhì)頁巖為研究對象,根據(jù)野外地質(zhì)觀測,并結(jié)合區(qū)域構(gòu)造背景分析,系統(tǒng)的論述了渝東北地區(qū)大隆期構(gòu)造特征對其頁巖氣發(fā)育的地質(zhì)意義。針對研究區(qū)內(nèi)采集的巖石樣品,對其進(jìn)行了巖石有機(jī)地球化學(xué)方面的測試分析,再結(jié)合前人資料,共得出以下幾點(diǎn)認(rèn)識。1、大隆組富有機(jī)質(zhì)泥頁巖的發(fā)育受到構(gòu)造控制。主要發(fā)育在開江-梁平海槽及城口-鄂西海槽內(nèi)部,而在其余地區(qū)沒有發(fā)育大隆組泥頁巖。2、晚二疊世,研究區(qū)內(nèi)古構(gòu)造格局為“兩隆兩凹”古地貌格局為“三緣兩高”。開江-梁平海槽及城口-鄂西海槽的形成是在南秦嶺洋拉張背景下,揚(yáng)子板塊內(nèi)部峨嵋地裂運(yùn)動(dòng)及基底斷裂的共同作用下形成的。3、海槽的形成對大隆組的控制具體表現(xiàn)在:晚二疊世由三種構(gòu)造運(yùn)動(dòng)綜合作用下形成的海槽,導(dǎo)致了大隆組沉積時(shí)的深水環(huán)境,大隆組的沉積環(huán)境控制了大隆組富有機(jī)質(zhì)頁巖的發(fā)育、分布及其有機(jī)質(zhì)特征。4、根據(jù)巖石顏色,巖石結(jié)構(gòu)構(gòu)造,巖石組合類型等標(biāo)志,可將大隆組所沉積的深水環(huán)境劃分出盆地相和陸棚相兩大沉積。大隆組中富有機(jī)質(zhì)泥頁巖主要發(fā)育于陸棚相,主要為硅質(zhì)泥巖,泥質(zhì)灰?guī)r,泥巖,砂質(zhì)泥巖及鈣質(zhì)泥巖等。5、大隆組礦物組分主要為粘土和脆性礦物,碳酸鹽礦物含量相對較低。脆性礦物以石英為主,粘土礦物主要為伊利石、伊蒙混層和綠泥石,碳酸鹽礦物以方解石為主。6、大隆組富有機(jī)質(zhì)頁巖的有機(jī)質(zhì)類型主要為Ⅱ型有機(jī)質(zhì),主要顯微組分為腐泥組,約占顯微組分的60%~80%。干酪根主要為Ⅱ1型,少量為Ⅱ2型。大隆組泥頁巖中Ro值有機(jī)質(zhì)的成熟度已達(dá)高-過成熟階段,多數(shù)為2.0-3.0%,對頁巖氣的形成十分有利,總有機(jī)碳含量較高量,主要分布于2%-4%,及6%的區(qū)間,具有良好的生烴潛力。
[Abstract]:In this paper, the organic shale of the Upper Permian Dalong formation in Sichuan Basin is taken as the research object, according to the field geological observation and the analysis of the regional tectonic background, This paper systematically discusses the geological significance of the structural characteristics of the Dalong period to the development of shale gas in northeast Chongqing. According to the rock samples collected in the study area, the organic geochemistry of the rocks was tested and analyzed. Combining with the previous data, it was concluded that the development of the organic matte shale in the Dalong formation was controlled by the structure. It is mainly developed in Kaijiang-Liangping trough and Chengkou-western Hubei trough, while in other areas there is no mud shale .2. late Permian. The paleotectonic pattern in the study area is "two uplift and two depression" paleogeomorphology pattern is "three margins and two heights". The formation of the Kaijiang-Liangping trough and the Chengkou-Western Hubei trough is under the background of the South Qinling Ocean extension. The formation of the trough controlled the Dalong formation by the combined action of the Emei tectonic movement and the basement fault in the Yangtze plate: the trough formed under the combined action of three tectonic movements in the late Permian, The depositional environment of the Dalong formation controls the development, distribution and organic matter characteristics of the organic shale in the Dalong formation, according to the color of the rock, the structure of the rock, the type of the rock assemblage, and so on, the sedimentary environment of the Dalong formation controls the development, distribution and organic matter characteristics of the organic shale of the Dalong formation. Deepwater environment of Dalong formation can be divided into basin facies and shelf facies. The organic matter rich mud shale in Dalong formation is mainly developed in continental shelf facies, mainly composed of siliceous mudstone, argillaceous limestone, mudstone, sandy mudstone and calcareous mudstone, etc. The mineral components of Dalong formation are mainly clay and brittle minerals, and the carbonate mineral content is relatively low. The brittle minerals are mainly quartz, the clay minerals are mainly Illite, Illite, and chlorite, and the carbonate minerals are calcite. 6. The organic matter type of organic shale in Dalong formation is mainly type 鈪，

本文編號：2039072