【摘要】：川中侏羅系涼高山組致密砂巖儲層是工區(qū)主要產(chǎn)油層系之一,該區(qū)多口井在涼高山組見良好油氣顯示,具有較好的勘探前景和巨大的勘探潛力。但由于涼上段儲層屬于典型的低孔、低滲的非均質(zhì)性儲層,勘探難度大,在油井富集區(qū)內(nèi)存在一些有砂無油或有孔無油的儲集層,如鮮9井、公17井和大成5井等井發(fā)育大段無油氣顯示的“白砂巖”,因此深入研究其儲層特征及含油性控制因素具有十分重要意義。 本文在前人研究的基礎(chǔ)上,以石油地質(zhì)學(xué)、地球化學(xué)、儲層地質(zhì)學(xué)和測井地質(zhì)學(xué)等理論和方法為指導(dǎo),運用鑄體薄片、掃描電鏡、高壓壓汞等先進(jìn)的技術(shù)和測試手段,系統(tǒng)分析了涼高山組儲層特征；在巖心觀察描述基礎(chǔ)上,結(jié)合測井資料對儲層含油性控制因素進(jìn)行了分析研究并取得了以下認(rèn)識。 川中侏羅系涼高山組烴源巖主要為涼上段黑色頁巖,縱向上與粉～細(xì)砂巖相間分布,一般累計厚度達(dá)到20-70m,橫向上烴源巖向東變厚。通過對研究區(qū)涼高山組烴源巖有機(jī)碳含量的研究發(fā)現(xiàn)有機(jī)碳含量介于0.13%到3.45%,平均豐度為1.46%,得出該區(qū)烴源巖有機(jī)質(zhì)豐度較高,說明了川中東部侏羅系涼高山組存在較好的烴源巖。有機(jī)質(zhì)類型以腐泥型和腐殖腐泥型為主,Ro均值為1.16%,處于成熟階段,具有較好的生烴潛力。 川中侏羅系涼高山組涼上段儲層巖石類型較單一,主要為長石巖屑砂巖和石英砂巖；砂巖粒度整體偏細(xì),主要為細(xì)—粉砂級。涼上段儲集空間類型主要由粒內(nèi)溶孔、粒間溶孔、構(gòu)造微裂縫等組成,原生孔隙相當(dāng)少見。儲層砂巖排驅(qū)壓力高、中值壓力高、汞不飽和體積高、孔喉半徑小、退汞效率低,并且喉道分選和孔隙結(jié)構(gòu)較差；孔隙度分布在1%～3%的占67.3%,孔隙度3%的僅占總孔隙度的12.4%,滲透率O.1mD占74.9%,總的來說砂巖的物性條件較差,呈現(xiàn)出典型的致密砂巖特征。 川中侏羅系涼高山組石油的富集宏觀上受烴源巖分布的影響,微觀上儲層含油性受到?jīng)龈呱浇M源儲間砂泥漸變段、儲層物性以及裂縫控制。當(dāng)烴源巖與儲層呈突變接觸沒有砂泥漸變段阻隔且儲層物性較好時油氣才能在儲層中富集；裂縫的發(fā)育不僅提高了儲層的物性條件還為油氣的運移提供了通道。從川中涼高山組致密儲集層含油性控制因素可以看出,涼高山組有利區(qū)帶主要選取位于灘壩微相的純凈砂體且烴源巖較厚的區(qū)域。
[Abstract]:The dense sandstone reservoir in the Jurassic in the middle of Sichuan is one of the main oil production lines in the work area. but because the cool upper section reservoir belongs to a typical low-porosity and low-permeability non-homogeneous reservoir, the exploration difficulty is large, and there are some sand-free or non-oil-free reservoirs in the oil well rich area, such as the "white sandstone" of the well development large section of the fresh 9 well, the male 17 well and the large 5-well and the like, Therefore, it is of great significance to study the reservoir characteristics and the oil-bearing control factors. On the basis of the previous studies, this paper is based on the theories and methods of petroleum geology, geochemistry, reservoir geology and logging geology, and uses advanced technology and test means such as cast body sheet, scanning electron microscope, high-pressure mercury-pressure mercury and so on. On the basis of core observation and description, the oil-bearing control factors of the reservoir are analyzed and studied by using the logging data, and the following recognition is obtained It is recognized that the source rock of the Jurassic in the Jurassic in the middle of Sichuan is mainly the black shale of the upper section, which is distributed in the longitudinal direction and the fine sandstone in the longitudinal direction, with the general accumulated thickness of 20-70m, and the source rock in the transverse direction The organic carbon content of the source rock in the cold mountain group in the study area is found to be between 0.13% and 3.45% and the average abundance is 1.46%. It is concluded that the abundance of organic matter in the source rock in this area is high, which indicates that the Jurassic in the eastern part of Sichuan is good. Source rock. The type of organic matter is dominated by the saprolite type and the humic type, with the Rao mean value of 1.16%, in the mature stage, it has a better life. Hydrocarbon potential. The reservoir rock type of the cold upper section of the Jurassic in the middle Jurassic in the Sichuan is single, mainly of the feldspar and the quartz sandstone and the quartz sandstone, and the sandstone particle size is very thin, mainly The type of the reservoir space of the cool upper section is mainly composed of the inner dissolving hole, the inter-grain dissolving hole, the micro-crack and the like, and the primary hole The gas-discharge pressure of the reservoir sandstone is high, the median pressure is high, the unsaturated volume of the mercury is high, the radius of the pore throat is small, the mercury-removing efficiency is low, and the throat separation and the pore structure are poor; the porosity distribution is 67.3% in 1-3%, the porosity is 3%, the porosity is only 12.4% of the total porosity, and the permeability is O.1 mD. 74.9%, in general, the physical property of the sandstone is poor, presenting a typical cause Characteristics of the dense sandstone. The accumulation of the oil in the Jurassic in the Jurassic in the middle of the basin is influenced by the distribution of the source rock, and the oil-bearing property of the micro-sandstone is affected by the gradual change of the sand and mud in the source of the cold and high mountains, and the reservoir When the source rock and the reservoir are in abrupt contact with the reservoir, the oil and gas can be enriched in the reservoir, and the development of the fracture not only improves the physical property of the reservoir but also the oil and gas As can be seen from the factors of oil-bearing control of the dense reservoir in the high-mountain group in the middle of Sichuan, it can be seen that the favorable zone of the cool mountain group mainly selects the pure sand body and the hydrocarbon which is located in the micro-facies of the beach dam.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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