本文關(guān)鍵詞：鄂爾多斯盆地吳起—志丹地區(qū)延長組長7段頁巖氣形成條件研究　出處：《西北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 泥頁巖微孔 頁巖氣 形成條件 延長組長7段 吳起-志丹地區(qū)

【摘要】：鄂爾多斯盆地具有豐富的油氣資源,盆地延長組長7段發(fā)育于湖盆鼎盛時期。吳起-志丹地區(qū)作為本次研究區(qū),其長7沉積期處于湖盆中心,為了明確研究區(qū)長7段頁巖氣形成條件,本論文在收集大量地質(zhì)、測井、分析化驗等資料及現(xiàn)場巖心觀察的基礎(chǔ)上,對采集樣品進(jìn)行了烴源巖、儲層物性等方面的分析測試,其中包括薄片鑒定、有機(jī)地化測試、孔滲分析、X衍射分析、場發(fā)射掃描電鏡觀察、含氣性分析。對吳起-志丹地區(qū)長7段頁巖氣形成條件進(jìn)行了深入研究,取得了以下新認(rèn)識:研究區(qū)長7時期以深湖相為主,泥頁巖厚度達(dá)90m,分布連續(xù)穩(wěn)定。TOC含量高,介于2.01%-12.03%之間。利用多元回歸分析法建立了吳起-志丹地區(qū)的TOC測井解釋模型,擬合效果較好,應(yīng)用該模型能夠較為準(zhǔn)確評價研究區(qū)有機(jī)質(zhì)豐度的平面變化。有機(jī)質(zhì)以II型為主,成熟度較高,Ro介于0.7%-1.2%之間,熱解峰溫主要分布于440-460℃之間。研究表明吳起-志丹地區(qū)長7段泥頁巖段有機(jī)質(zhì)豐度高,厚度大,且熱演化達(dá)到生油氣階段,具有形成頁巖氣的物質(zhì)條件。研究區(qū)泥頁巖礦物組成主要為石英和黏土礦物。石英含量平均為31.11%,黏土礦物含量平均為28.98%,主要由綠泥石、伊利石和伊蒙混層組成。泥頁巖脆性指數(shù)分布于0.53-0.75之間,孔隙度平均為2.82%,滲透率平均為0.028×10-3μm2。場發(fā)射掃描電鏡等分析表明研究區(qū)泥頁巖微孔類型主要以粒間孔和晶間孔為主,有機(jī)質(zhì)孔發(fā)育差。孔徑主要分布于30-300nm,以中孔-宏孔為主,微孔基本不發(fā)育。頁巖喉道半徑分布在10.79nm-190nm,主要分布在15nm-30nm之間,為納米級孔喉,頁巖儲層孔滲條件較差。通過氣測數(shù)據(jù)可知研究區(qū)含氣量分布區(qū)間為2.6m3/t-5.5m3/t,大于頁巖氣開發(fā)標(biāo)準(zhǔn)的下限值。研究發(fā)現(xiàn)泥頁巖含氣量受泥巖厚度、TOC、石英和黏土礦物含量等多種因素的影響。根據(jù)泥頁巖的烴源巖生氣潛力、儲集特征,結(jié)合實測泥頁巖含氣情況制定了適合研究區(qū)的頁巖氣評價標(biāo)準(zhǔn),預(yù)測了長7段頁巖氣有利勘探區(qū)。
[Abstract]:Ordos basin has abundant oil and gas resources, the basin member 7 of Yanchang formation developed in the heyday of the basin. In Wuqi - Zhidan area as the study area, the long period in 7 sedimentary basin center, in order to clear the research section of Chang 7 shale gas formation conditions, this paper collected a large number of geological, well logging, based on experiment data and field observation of cores, the collected samples of source rock, reservoir analysis and other aspects, including thin section identification, organic geochemical test, porosity and permeability analysis, X diffraction, field emission scanning electron microscopy observation, analysis of gas. On the Zhidan area of Chang 7 shale gas formation conditions are studied deeply, has made the following research: new understanding of Chang 7 period in deep lake facies, mud shale thickness of 90m, the distribution of continuous and stable content of.TOC is high, the range of 2.01%-12.03%. By using multiple regression analysis method The Wuqi and Zhidan area TOC logging interpretation model, the fitting effect is good, the application of the model can be more accurate evaluation of district level changes the abundance of organic matter. The organic matter is mainly of II type, high maturity, Ro between 0.7%-1.2% and pyrolysis peak temperature between 440-460 DEG C is mainly distributed in the Zhidan area. The results show that Wuqi long the 7 section of mud shale with high organic matter abundance, thickness, and thermal evolution of hydrocarbon generation at the gas phase, with the formation of shale gas material conditions. Study area of shale mineral is mainly composed of quartz and clay minerals. Quartz content was 31.11%, the average content of clay minerals is 28.98%, mainly composed of chlorite, illite and illite layer. The shale brittleness index distribution between 0.53-0.75, the average porosity is 2.82%, the average permeability is 0.028 x 10-3 scanning electron microscopy m2. field shows that the shale pore type in the study area, the main To and intergranular pores, organic matter pores. The aperture is mainly distributed in the 30-300nm, with a hole in the macro pore, micropore no development. Shale distribution of throat radius in 10.79nm-190nm, mainly in 15nm-30nm, nano pore throat, a poor permeability shale reservoir pore. Test data showed that the study area gas distribution range of 2.6m3/t-5.5m3/t by gas, shale gas development is greater than the standard limit value. The study found that the shale gas content by mudstone thickness, TOC, a variety of factors such as quartz and clay mineral content. According to the shale source rocks potential, reservoir characteristics, combined with the measured shale the gas to develop shale gas evaluation standards suitable for the study area, the prediction of Chang 7 shale gas favorable exploration area.

【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13
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本文編號：1436044