【摘要】：柴達(dá)木盆地北緣是青海省最重要的含煤盆地,其侏羅系富含有機(jī)質(zhì)泥巖地層發(fā)育厚度大,有機(jī)質(zhì)成熟度好,具備良好的頁巖氣地質(zhì)條件。對(duì)柴北緣頁巖氣地質(zhì)條件進(jìn)行系統(tǒng)研究,估算其資源量,對(duì)進(jìn)一步頁巖氣勘探開發(fā)工作的部署,有較好的指導(dǎo)意義。對(duì)青海省能源結(jié)構(gòu)調(diào)整及緩解能源壓力都將發(fā)揮積極作用。本文以《青海省頁巖氣資源戰(zhàn)略調(diào)查與選區(qū)》課題項(xiàng)目為依托,在掌握柴北緣區(qū)侏羅系地層區(qū)域地質(zhì)背景的基礎(chǔ)上,分析侏羅系富有機(jī)質(zhì)暗色泥頁巖生烴條件、儲(chǔ)集保持條件及含氣性特征,進(jìn)行資源量估算和有利勘探區(qū)優(yōu)選。本文對(duì)以往鉆孔資料的收集和分析的基礎(chǔ)上認(rèn)為下三角洲平原的分流間灣以及三角洲前緣、濱湖、淺湖、半深湖環(huán)境是泥頁巖形成的有利環(huán)境。大量鉆孔和地震數(shù)據(jù)表明,柴北緣冷湖地區(qū)泥頁巖厚度大于1000m,團(tuán)魚山、魚卡、大煤溝等地泥巖厚度可達(dá)100m～500m。有機(jī)質(zhì)演化程度多為低成熟—成熟水平;冷湖地區(qū)TOC含量約3.0%,團(tuán)魚山、魚卡、大煤溝等地的Toc含量1.0%～3.0%,都達(dá)到了好烴源巖標(biāo)準(zhǔn)。通過儲(chǔ)層脆性礦物特征具,“高硅質(zhì)、高粘土、低碳酸鹽”的特點(diǎn),儲(chǔ)集空間類型發(fā)育,含氣顯示明顯,具備良好的頁巖氣開發(fā)條件。通過體積法,對(duì)頁巖氣源量進(jìn)行了估算。利用TOC相關(guān)法獲取了研究區(qū)侏羅系泥頁巖含氣量。經(jīng)計(jì)算,得出柴北緣地區(qū)侏羅系頁巖氣地質(zhì)資源量為9817.6億m3,結(jié)合泥巖厚度、泥巖所在地層的埋深、有機(jī)碳含量、熱演化程度、地表?xiàng)l件等有利區(qū)選取標(biāo)準(zhǔn),選取了柴北緣冷湖三號(hào)、冷湖四號(hào)地區(qū)、魚卡、團(tuán)魚山、大煤溝、綠草山、大頭羊、為頁巖氣有利勘探區(qū)。
[Abstract]:The northern margin of Qaidam Basin is the most important coal-bearing basin in Qinghai Province. Its Jurassic mudstone rich in organic matter has a large thickness and maturity of organic matter, and has good shale gas geological conditions. The geological conditions of shale gas in the northern margin of Qaidam are studied systematically, and the amount of shale gas resources is estimated, which is of great significance for the deployment of further exploration and development of shale gas. Qinghai energy structure adjustment and relief of energy pressure will play a positive role. Based on the project of "Strategic investigation and selection of Shale Gas Resources in Qinghai Province", and on the basis of understanding the regional geological background of Jurassic strata in the northern margin of Qaidam, this paper analyzes the hydrocarbon generation conditions of Jurassic organic matter rich dark mud shale. Reservoir preservation conditions and gas-bearing characteristics, resource estimation and favorable exploration area selection. Based on the collection and analysis of the previous drilling data, it is considered that the interdistributary bay of the lower delta plain and the delta front, littoral, shallow and semi-deep lacustrine environments are the favorable environment for shale formation. A large number of boreholes and seismic data show that the thickness of shale is more than 1000m in the Lenghu area of the northern margin of Qaidam, and the thickness of mudstone in Tuanyushan, Yuka and Dahuagou can reach 100m / 500m. The evolution degree of organic matter is mostly low mature level, the TOC content in Lenghu area is about 3.0 and the Toc content in Tuanyushan, Yuka, Dachaigou and other places has reached the standard of good hydrocarbon source rock. Through the characteristics of brittle mineral, "high siliceous, high clay and low carbonate", the reservoir space type is developed, the gas content is obvious, and the development condition of shale gas is good. The shale gas source is estimated by volume method. The gas content of Jurassic shale was obtained by TOC correlation method. By calculation, the geological resources of Jurassic shale gas in the northern margin of Qaihai are 981.76 billion m3, combining with the thickness of mudstone, the buried depth of the mudstone, the content of organic carbon, the degree of thermal evolution, the surface condition, and so on. Lenghu No.3, Lenghu No.4, Yuka, Tuanyushan, Dachaigou, Lucaoshan and Datouyang in northern margin of Qaihai are selected as favorable exploration areas for shale gas.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13

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