吉林油田致密油气藏储层敏感性评价研究

发布时间：2018-08-08 18:13

【摘要】：伊通、王府、德惠以及让字井区块岩心均属于超低渗岩心,其中王府、德惠区块以及让字井区块岩心渗透率基本处于纳达西级别。研究区块以致密油、气臧为主,岩石几乎没有渗流能力。根据油田储层特征以及压裂施工情况,将吉林油田生产区域(伊通、王府、德惠、让字井区块)的超低渗岩心进行造缝处理,模拟天然裂缝的网状缝类型和模拟人造压裂裂缝的单缝类型,使造缝后岩心渗透率集中在50～100×10-3μm2,岩心渗流能力提高。对四个研究区块的储层岩心分别进行了粘土矿物和全岩矿物分析,并根据岩性理论研究预测各储层的敏感性。具体情况如下：让字井区块泉四段全岩矿物含量为石英45.8%,钾长石8.4%,斜长石25.1%,方解石5.3%,粘土矿物含量为15.4%,其中伊利石在粘土矿物的绝对含量中占3.39%左右、伊/蒙混层在2.77%左右、高岭石在0%、绿泥石在9.24%左右、蒙脱石为0%；吉林油田伊通双二段层位的全岩矿物测试结果：石英为91.7%,粘土矿物含量为8.3%,其中伊利石在粘土矿物的绝对含量中占3.57%左右、伊/蒙混层4.48%左右、高岭石0%、绿泥石0.25%左右、蒙脱石为0%；德惠区块双河子组全岩矿物含量为石英52.1%,钾长石4.3%,斜长石27.6%,方解石3.2%,粘土矿物含量为12.8%,其中伊利石在粘土矿物的绝对含量中占3.58%左右、伊/蒙混层4.48%左右、高岭石0%、绿泥石4.74%左右、蒙脱石为0%；王府区块泉四段全岩矿物含量为石英38.3%,斜长石20.3%,方解石21.4%,硬石膏2.4%,粘土矿物含量为17.6%,其中平均粘土矿物绝对含量中伊利石在5.28%左右、伊/蒙混层在9.15%左右、高岭石在0%、绿泥石在3.17%左右、蒙脱石为0%。通过室内储层敏感性的评价分析实验,评价分析各区块地层的速敏、盐敏、水敏、酸敏、碱敏、应敏以及温敏,得到储层各种敏感实验的结论为：让子井区块,泉四段油层是强速敏、中等偏弱水敏、中等偏强酸敏、弱碱敏、强应敏、强温敏特性的油层。伊通区块,双二段油气层是具有中等偏强速敏、中等偏强水敏、弱酸敏、弱碱敏、强应敏、中等偏强温敏的敏感特性油气层。德惠区块,沙河子组气层是具有强速敏、强水敏、中等偏弱酸敏、弱碱敏、强应敏、强温敏的敏感特性气层。王府区块气层是具有强速敏、强水敏、弱酸敏、强碱敏、强应敏、强温敏的敏感特性气层。通过对各种工作液在吉林油田研究区块运用过程中的伤害机理进行研究,可知无论是外来流体本身对地层孔渗结构的影响,还是由于孔渗结构的外部原因发生的改变,本质上都会产生敏感伤害,最终也都会造成油相渗透率降低,孔隙堵塞,进而影响油、气井的产量并且伤害储层。但是通过结合油田地层敏感性评价结果以及油气层相关的地质特征,在弄清储层特征及工作液对地层造成潜在伤害的原因的基础上,有针对性的研究适应吉林油田的四种储层保护型工作液体系(压井液、射孔液、洗井液、防水锁剂),会发现储层保护型工作液对储层造成伤害后的渗透率恢复值均大于95%,具有很好的保护储层的作用,可以有效地提升油、气井的开发。根据室内实验结合现场施工分析研究发现,在各项施工过程中,利用具有针对性的工作液体系并结合敏感性评价结果的建议进行施工,可以达到较高水平的保护储层的效果。
[Abstract]:The core of Yitong, Wangfu, Dehui and zetzai block belong to ultra low permeability core. The core permeability of Wangfu, Dehui block and zetzang block is basically at the Na Da West level. The research area is so that dense oil, gas Zang is the main reservoir, and the rock has almost no percolation capacity. According to the reservoir characteristics and the fracturing construction, the Jilin oilfield is born. The ultra low permeability core of the production area (Yitong, Wangfu, Dehui, Yoshi block) is seamed to simulate the network seam type of the natural fracture and the single fracture type of the artificial fracture. The core permeability after the seam is concentrated at 50~100 * 10-3 Mu m2, the core percolation ability is higher. The core of the reservoir rock of the four research blocks is respectively glued. The analysis of soil minerals and whole rock minerals and the prediction of the sensitivity of each reservoir according to the lithology theory. The specific conditions are as follows: the total rock mineral content in the four section of the block spring of zywell is 45.8% of quartz, 8.4% of potassium feldspar, 25.1% of plagioclase, 5.3% of calcite and 15.4% in clay minerals, of which about 3.39% of the absolute content of clay minerals is in the illite. The Iraq / montmorillonite layer is about 2.77%, kaolinite is 0%, chlorite is about 9.24%, and montmorillonite is 0%. The whole rock mineral test results of the Yitong double two segment of Jilin oilfield are 91.7%, clay mineral content is 8.3%, among which illite is about 3.57% in the absolute content of clay minerals, about 4.48% in Iraq / montmorillonite, 0% of kaolinite and 0. in chlorite. About 25%, montmorillonite is 0%; the total rock mineral content of the Dehui block Shuanghe Zi formation is quartz 52.1%, potassium feldspar 4.3%, plagioclase 27.6%, calcite 3.2%, and clay mineral content 12.8%, among which illite is about 3.58% in the absolute content of clay minerals, about 4.48% in Iraq / montmorillonite, 0% of kaolinite, 4.74% in chlorite, and montmorillonite as 0%. The total rock mineral content in the four section of the block spring is quartz 38.3%, plagioclase 20.3%, calcite 21.4%, anhydrite 2.4%, and clay mineral content 17.6%, of which the average clay mineral content is about 5.28%, the irony is about 9.15%, the kaolinite is 0%, and the chlorite is 3.17%, and the montmorillonite is 0%. through indoor reservoir sensitivity evaluation. The price analysis experiments have been made to evaluate and analyze the speed sensitivity, salt sensitivity, water sensitivity, acid sensitivity, alkali sensitivity, stress sensitivity and temperature sensitivity of each block formation. The conclusion of various sensitive experiments of the reservoir is that the reservoir of the sub well block and the four section of the spring are the oil layer of strong speed sensitive, medium weak water sensitivity, medium strong acid sensitivity, weak alkali sensitivity, strong sensitivity and strong temperature sensitivity. The gas layer is a sensitive gas reservoir with medium strong speed sensitivity, medium strong water sensitivity, weak acid sensitivity, weak alkali sensitivity, strong sensitivity and moderate strong Wen Min. The Dehui block, Shahe sub formation is a gas reservoir with strong speed sensitivity, strong water sensitivity, moderate weak acid sensitivity, weak alkali sensitivity, strong sensitivity and strong temperature sensitivity. The gas reservoir in Wangfu block is characterized by strong speed and strong water. Sensitive, weak acid sensitive, strong alkali sensitive, strong sensitive, and strong sensitive gas sensitive gas reservoir. Through the study of the damage mechanism of various working fluids in the study area of Jilin oilfield, it is known that both the influence of the external fluid itself on the pore structure and the change of the external cause of the porous structure will be produced in essence. Sensitive damage will eventually cause oil phase permeability decrease, pore blockage, and then affect oil and gas well production and damage reservoir. But on the basis of combining reservoir sensitivity evaluation results and oil and gas reservoir related geological characteristics, it is based on identifying the reservoir characteristics and the cause of the potential damage to the formation by the reservoir characteristics and working fluid. The study adapts to four types of reservoir protection working fluid system (well fluid, perforating fluid, well washing liquid, waterproof lock agent) in Jilin oilfield. It will be found that the recovery value of the reservoir protective working fluid is more than 95% after damage to the reservoir. It has a good function of protecting the reservoir and can effectively improve the development of oil and gas wells. It is found that in the construction process, the effect of high level of reservoir protection can be achieved in the construction process by using the proposed working liquid system and the suggestion of the sensitivity evaluation results.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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