本文關(guān)鍵詞：淺部流體對蓬萊9-1潛山花崗巖儲層的改造作用　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 酸性流體 潛山花崗巖 水巖相互作用

【摘要】：蓬萊9-1構(gòu)造是渤海首個(gè)大型中生界花崗巖潛山油田,其儲集空間主要為裂縫和孔隙。整體為大型半背斜構(gòu)造,依附于廟西北凸起東界大斷層發(fā)育,該區(qū)潛山具有雙重結(jié)構(gòu),由元古界變質(zhì)巖和中生代花崗巖侵入體共同組成,存在南、北兩個(gè)獨(dú)立高點(diǎn),在侵入帶上發(fā)育花崗巖風(fēng)化殼,是良好的油氣儲集空間,其風(fēng)化殼之上主要為曲流河-淺水三角洲沉積。蓬萊9-1油田儲層發(fā)育,儲、蓋組合理想,具有優(yōu)越的成藏條件�；◢弾r潛山儲層儲集空間由孔隙型—裂縫-孔隙型—孔隙-裂縫型呈現(xiàn)有規(guī)律的變化,流體的性質(zhì)為良好儲層的形成提供條件。本文以蓬萊9-1潛山花崗巖為研究對象,模擬了三種不同流體與花崗巖相互作用的實(shí)驗(yàn),揭示不同流體對花崗巖儲層的控制機(jī)理。三種流體為大氣水、有機(jī)酸(地層水)、大氣水+有機(jī)酸(地層水),進(jìn)行3種流體在60℃、90℃、120℃、150℃、180℃條件下與花崗巖樣品相互作用實(shí)驗(yàn)研究,實(shí)驗(yàn)結(jié)果表明:(1)礦物發(fā)生溶蝕、溶解:花崗巖樣品在3種流體不同溫度作用下,斜長石和堿性長石沿著裂隙、解理縫和表面發(fā)生溶蝕、溶解,溶解程度隨溫度升高而增強(qiáng),表現(xiàn)為凹坑狀-淺槽狀-帶狀-深溝狀溶蝕的變化過程;石英溶蝕現(xiàn)象不明顯。(2)生成次生礦物:花崗巖樣品在3種流體不同溫度實(shí)驗(yàn)后,礦物表面和孔隙中形成不同形態(tài)的次生高嶺石,在大氣水溶液試驗(yàn)中還生成片狀綠泥石,并隨反應(yīng)溫度升高,次生高嶺石晶形由片狀向板狀變化。(3)吼道半徑和面孔率增大:實(shí)驗(yàn)發(fā)現(xiàn)隨反應(yīng)溫度升高,3組實(shí)驗(yàn)樣品中礦物解理縫和裂隙溶蝕擴(kuò)大,使孔隙空間增大、孔隙連通性變好;礦物粒內(nèi)微孔隙溶蝕、溶解形成粒內(nèi)帶狀、淺槽狀溶孔;樣品孔隙喉道增大,面孔率增大。(1)在大氣水與花崗巖反應(yīng)實(shí)驗(yàn)中,樣品的面孔率由實(shí)驗(yàn)前的4.76%隨著實(shí)驗(yàn)進(jìn)行中溫度的升高逐漸變?yōu)?80℃時(shí)的11.89%,面孔率平均值增加7.13%;(2)在有機(jī)酸與花崗巖反應(yīng)實(shí)驗(yàn)中,樣品的面孔率由實(shí)驗(yàn)前的4.76%漸變?yōu)?80℃時(shí)的17.01%,面孔率平均值增加12.25%;(3)在大氣水+有機(jī)酸與花崗巖反應(yīng)實(shí)驗(yàn)中,樣品的面孔率由實(shí)驗(yàn)前的4.76%漸變?yōu)?80℃時(shí)的13.61%,面孔率平均值增加8.85%。(4)有機(jī)酸條件下樣品溶蝕更強(qiáng)烈:對比3組試驗(yàn)結(jié)果發(fā)現(xiàn)有機(jī)酸條件下樣品溶蝕更強(qiáng)烈;溫度越高流體對樣品物性改造越強(qiáng)。含有機(jī)酸溶液對樣品物性的改造結(jié)果顯示:實(shí)驗(yàn)樣品在180℃反應(yīng)后比反應(yīng)前的面孔率增加12.25%、喉道平均值增加5.35μm,有效提高了花崗巖儲層物性。不同流體在不同溫度條件下對儲層物性影響各不相同,實(shí)驗(yàn)發(fā)現(xiàn)有機(jī)酸對樣品改造最明顯,為儲層良好物性的形成提供了直接證據(jù)。而儲層物性對油氣的分布和富集程度具有重要影響,因此,研究流體對儲層的改造作用在油氣層儲集方面具有很重要的意義。查明淺部流體對蓬萊9-1潛山花崗巖儲層的改造作用機(jī)制,是進(jìn)一步優(yōu)化儲集空間的關(guān)鍵。實(shí)驗(yàn)研究淺部流體對蓬萊9-1潛山花崗巖儲層的改造作用,有利于進(jìn)一步查明花崗巖在不同介質(zhì)條件下的穩(wěn)定性和地球化學(xué)特征,有利于揭示流體對儲層物性的改造作用,為該區(qū)花崗巖儲層形成機(jī)制提供直接證據(jù),并對其他地區(qū)砂巖儲層后期流體改造也具有實(shí)際的指導(dǎo)意義。
[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.

【學(xué)位授予單位】：吉林大學(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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