川中地区侏罗系凉高山组储层特征及含油性控制因素

发布时间：2019-05-27 09:53

【摘要】：川中侏罗系凉高山组致密砂岩储层是工区主要产油层系之一,该区多口井在凉高山组见良好油气显示,具有较好的勘探前景和巨大的勘探潜力。但由于凉上段储层属于典型的低孔、低渗的非均质性储层,勘探难度大,在油井富集区内存在一些有砂无油或有孔无油的储集层,如鲜9井、公17井和大成5井等井发育大段无油气显示的“白砂岩”,因此深入研究其储层特征及含油性控制因素具有十分重要意义。本文在前人研究的基础上,以石油地质学、地球化学、储层地质学和测井地质学等理论和方法为指导,运用铸体薄片、扫描电镜、高压压汞等先进的技术和测试手段,系统分析了凉高山组储层特征；在岩心观察描述基础上,结合测井资料对储层含油性控制因素进行了分析研究并取得了以下认识。川中侏罗系凉高山组烃源岩主要为凉上段黑色页岩,纵向上与粉～细砂岩相间分布,一般累计厚度达到20-70m,横向上烃源岩向东变厚。通过对研究区凉高山组烃源岩有机碳含量的研究发现有机碳含量介于0.13%到3.45%,平均丰度为1.46%,得出该区烃源岩有机质丰度较高,说明了川中东部侏罗系凉高山组存在较好的烃源岩。有机质类型以腐泥型和腐殖腐泥型为主,Ro均值为1.16%,处于成熟阶段,具有较好的生烃潜力。川中侏罗系凉高山组凉上段储层岩石类型较单一,主要为长石岩屑砂岩和石英砂岩；砂岩粒度整体偏细,主要为细—粉砂级。凉上段储集空间类型主要由粒内溶孔、粒间溶孔、构造微裂缝等组成,原生孔隙相当少见。储层砂岩排驱压力高、中值压力高、汞不饱和体积高、孔喉半径小、退汞效率低,并且喉道分选和孔隙结构较差；孔隙度分布在1%～3%的占67.3%,孔隙度3%的仅占总孔隙度的12.4%,渗透率O.1mD占74.9%,总的来说砂岩的物性条件较差,呈现出典型的致密砂岩特征。川中侏罗系凉高山组石油的富集宏观上受烃源岩分布的影响,微观上储层含油性受到凉高山组源储间砂泥渐变段、储层物性以及裂缝控制。当烃源岩与储层呈突变接触没有砂泥渐变段阻隔且储层物性较好时油气才能在储层中富集；裂缝的发育不仅提高了储层的物性条件还为油气的运移提供了通道。从川中凉高山组致密储集层含油性控制因素可以看出,凉高山组有利区带主要选取位于滩坝微相的纯净砂体且烃源岩较厚的区域。
[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.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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