【摘要】：青海省木里地區(qū)經(jīng)過鉆孔取樣發(fā)現(xiàn)地層中含有可燃冰,這對南祁連盆地凍土區(qū)可燃冰找礦工作具有十分重要的意義。因此對該區(qū)可能作為生油氣層的地層進行研究是具有很大意義的。通常我們又將可作為生油氣層的地層叫做烴源巖,并且按一定方法對其進行評價。本文主要是通過對工作區(qū)內(nèi)二疊系地質(zhì)剖面的測制、野外區(qū)域地質(zhì)調(diào)查、野外樣品采集、實驗室樣品數(shù)據(jù)測試、室內(nèi)剖面圖和柱狀圖繪制、樣品數(shù)據(jù)分析來對二疊系烴源巖的生儲蓋組合分析。對研究區(qū)目標(biāo)層位展開一系列工作,發(fā)現(xiàn)研究區(qū)二疊紀地層主要以灰色微晶灰?guī)r、亮晶灰?guī)r、長石石英砂巖、巖屑石英砂巖、石英砂巖為主,可見少量紫紅色泥巖。在薄片觀察基礎(chǔ)下發(fā)現(xiàn),研究區(qū)砂巖一般成熟度不高、分選也十分不好,偶爾發(fā)育有裂隙和空洞,但多被后期充填。對二疊紀可作為烴源巖的灰?guī)r、泥巖進行熱解分析,發(fā)現(xiàn)二疊紀烴源巖能作為生油氣的有機碳含量很低,二疊紀中能作為生油氣層的灰?guī)r、泥巖樣品數(shù)據(jù)顯示二疊紀烴源巖有機碳含量基本為0,可初步判定二疊紀烴源巖為無效烴源巖。然后結(jié)合對二疊紀烴源巖的熱演化程度和沉積相分析,綜合結(jié)果,得出二疊紀中能作為生油氣層的灰?guī)r、泥,頁巖在沉積時其中有機碳含量就十分低下。雖然,本文對二疊紀烴源巖的總體特征評價為無價值烴源巖,但這也具有十分重要意義,能為后來工作者提供一定的科學(xué)依據(jù),避免造成無效損失。
[Abstract]:It is found that there is combustible ice in the stratum through borehole sampling in Muli area of Qinghai Province which is of great significance to the prospecting of combustible ice in the frozen soil region of South Qilian Basin. Therefore, it is of great significance to study the strata which may be regarded as oil and gas generating zones in this area. Usually, the formation that can be used as source rock is called source rock and evaluated according to certain method. This paper is mainly through the measurement of the Permian geological profile in the working area, the field regional geological survey, the field sample collection, the laboratory sample data testing, the drawing of the indoor profile and the histogram. Sample data analysis is used to analyze the generation, reservoir and cap assemblage of Permian source rocks. It is found that the Permian strata in the study area are mainly composed of grey microcrystalline limestone, bright grained limestone, feldspar quartz sandstone, lithic quartz sandstone, quartz sandstone and a small amount of fuchsia mudstone. On the basis of thin slice observation, it is found that the sandstone in the study area is generally not high in maturity and poor in sorting. Occasionally there are cracks and voids, but most of them are filled in later stage. The pyrolysis analysis of Permian limestone and mudstone as source rock shows that Permian source rock can be used as hydrocarbon source rock with very low organic carbon content, and Permian source rock can be used as oil and gas generating layer limestone in Permian. The data of mudstone samples show that the organic carbon content of Permian source rocks is basically 0, which can be preliminarily determined as ineffective source rocks. Based on the analysis of the thermal evolution and sedimentary facies of Permian source rocks, it is concluded that the organic carbon content in the limestone, mud and shale is very low in the Permian period. Although the general characteristics of Permian source rocks are evaluated as worthless source rocks in this paper, this is also of great significance, which can provide some scientific basis for future workers and avoid invalid losses.
【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

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