浅部流体对蓬莱9-1潜山花岗岩储层的改造作用

发布时间：2018-01-16 23:37

本文关键词：浅部流体对蓬莱9-1潜山花岗岩储层的改造作用　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：蓬莱9-1构造是渤海首个大型中生界花岗岩潜山油田,其储集空间主要为裂缝和孔隙。整体为大型半背斜构造,依附于庙西北凸起东界大断层发育,该区潜山具有双重结构,由元古界变质岩和中生代花岗岩侵入体共同组成,存在南、北两个独立高点,在侵入带上发育花岗岩风化壳,是良好的油气储集空间,其风化壳之上主要为曲流河-浅水三角洲沉积。蓬莱9-1油田储层发育,储、盖组合理想,具有优越的成藏条件。花岗岩潜山储层储集空间由孔隙型—裂缝-孔隙型—孔隙-裂缝型呈现有规律的变化,流体的性质为良好储层的形成提供条件。本文以蓬莱9-1潜山花岗岩为研究对象,模拟了三种不同流体与花岗岩相互作用的实验,揭示不同流体对花岗岩储层的控制机理。三种流体为大气水、有机酸(地层水)、大气水+有机酸(地层水),进行3种流体在60℃、90℃、120℃、150℃、180℃条件下与花岗岩样品相互作用实验研究,实验结果表明:(1)矿物发生溶蚀、溶解:花岗岩样品在3种流体不同温度作用下,斜长石和碱性长石沿着裂隙、解理缝和表面发生溶蚀、溶解,溶解程度随温度升高而增强,表现为凹坑状-浅槽状-带状-深沟状溶蚀的变化过程;石英溶蚀现象不明显。(2)生成次生矿物:花岗岩样品在3种流体不同温度实验后,矿物表面和孔隙中形成不同形态的次生高岭石,在大气水溶液试验中还生成片状绿泥石,并随反应温度升高,次生高岭石晶形由片状向板状变化。(3)吼道半径和面孔率增大:实验发现随反应温度升高,3组实验样品中矿物解理缝和裂隙溶蚀扩大,使孔隙空间增大、孔隙连通性变好;矿物粒内微孔隙溶蚀、溶解形成粒内带状、浅槽状溶孔;样品孔隙喉道增大,面孔率增大。(1)在大气水与花岗岩反应实验中,样品的面孔率由实验前的4.76%随着实验进行中温度的升高逐渐变为180℃时的11.89%,面孔率平均值增加7.13%;(2)在有机酸与花岗岩反应实验中,样品的面孔率由实验前的4.76%渐变为180℃时的17.01%,面孔率平均值增加12.25%;(3)在大气水+有机酸与花岗岩反应实验中,样品的面孔率由实验前的4.76%渐变为180℃时的13.61%,面孔率平均值增加8.85%。(4)有机酸条件下样品溶蚀更强烈:对比3组试验结果发现有机酸条件下样品溶蚀更强烈;温度越高流体对样品物性改造越强。含有机酸溶液对样品物性的改造结果显示:实验样品在180℃反应后比反应前的面孔率增加12.25%、喉道平均值增加5.35μm,有效提高了花岗岩储层物性。不同流体在不同温度条件下对储层物性影响各不相同,实验发现有机酸对样品改造最明显,为储层良好物性的形成提供了直接证据。而储层物性对油气的分布和富集程度具有重要影响,因此,研究流体对储层的改造作用在油气层储集方面具有很重要的意义。查明浅部流体对蓬莱9-1潜山花岗岩储层的改造作用机制,是进一步优化储集空间的关键。实验研究浅部流体对蓬莱9-1潜山花岗岩储层的改造作用,有利于进一步查明花岗岩在不同介质条件下的稳定性和地球化学特征,有利于揭示流体对储层物性的改造作用,为该区花岗岩储层形成机制提供直接证据,并对其他地区砂岩储层后期流体改造也具有实际的指导意义。
[Abstract]:Penglai 9-1 construction is Bohai's first large-scale Mesozoic granite in Qianshan oilfield, the reservoir space is mainly of cracks and pores. As a whole large semi anticline, attached to the temple of Northwest east boundary fault uplift and development, the Qianshan area has a dual structure, composed of Proterozoic metamorphic rocks and Mesozoic granitic intrusions formed in the South. North two independent high in the invaded zone developed on granite weathering crust, is a set of storage space for oil and gas well, the weathering crust on mainly meandering river, shallow Delta. Penglai 9-1 oil reservoir, reservoir, cover group rational thought, has superior reservoir forming conditions of granite in Qianshan reservoir. Set space by pore - fracture pore type, pore fracture type changed regularly, the nature of the fluid to provide conditions for the formation of good reservoirs. This paper takes Penglai 9-1 granite in Qianshan as the research object, the simulation of three different The fluid and granite interaction experiments reveal the control mechanism of different fluid on the granite reservoir. Three kinds of fluid for atmospheric water, organic acids (formation water), atmospheric water + organic acids (formation water), 3 kinds of fluid at 60 C, 90 C, 120 C, 150 C, 180 C Experimental Study under the condition of granite sample interaction, the experimental results show that: (1) mineral dissolution, dissolution: granite samples in 3 kinds of fluid under different temperature, plagioclase and alkali feldspar along the fracture, dissolution, cleavage and surface dissolution, the dissolution degree increased with temperature increased, and changes of shallow concave groove shaped strip - shaped deep groove corrosion process; quartz dissolution phenomenon is not obvious. (2) generation of secondary minerals: granite samples under 3 different fluid temperature after the experiment, the formation of different forms of secondary kaolinite mineral surface and pore, also generated in atmospheric water solution test The shape of chlorite, and with the increase of the reaction temperature, the secondary crystalline kaolinite from flake to plate change. (3) roared and faces radius: the experimental rate increases with the increase of the reaction temperature, expand MINERAL CLEAVAGE 3 groups of experimental samples in joint and fissure corrosion, the pore space increases, cause Kong Xilian better micro mineral grain; the formation of intragranular dissolution pore, dissolution belt, shallow groove shaped pores; pore throat samples increase, face increases. (1) in the atmospheric water and the granite reaction experiment, the sample rate by 4.76% faces before the experiment with experiment in high temperature rise gradually to 180 DEG C when the 11.89% faces the average rate increased by 7.13%; (2) in the organic acid and the granite reaction experiment, the sample rate by face before the experiment 4.76% gradient is 180 degrees centigrade 17.01%, face the average rate increased by 12.25%; (3) in atmospheric water + organic acid and granite rock reaction experiments, sample faces From before the experiment 4.76% gradient is 180 degrees centigrade 13.61%, face the average rate increase of 8.85%. (4) organic acid under the conditions of sample dissolution more strongly: comparison of 3 groups of test results found that organic acid under the conditions of sample dissolution more strongly; the higher the temperature of the fluid samples of the stronger solution containing organic acid modification. On the physical properties of the samples showed that the samples at 180 DEG C after the reaction than face before reaction rate increases 12.25%, the average throat value increased 5.35 m, effectively improve the granite reservoir. The different fluid under different temperature conditions of reservoir effects of different organic acids, were found the most obvious transformation of the sample, providing direct evidence for the formation of good reservoir properties. And the distribution of reservoir of oil and gas enrichment degree and has an important influence, therefore, the transformation effect of fluid on reservoir has very important significance in the oil and gas reservoir The transformation mechanism of righteousness. Find out the superficial fluid of Penglai 9-1 Qianshan granite reservoir, the reservoir space is the key to further optimize the transformation. Experimental study on the effect of shallow fluid on the Penglai 9-1 Qianshan granite reservoir, is conducive to further identify the stability of granite and earth in different medium conditions of chemical features, it is helpful to reveal the transformation the effect of fluid on reservoir properties, provide direct evidence for the granite reservoir forming mechanism, and the rest of the sandstone reservoir fluid transformation also has practical significance.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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