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| 埋藏有机酸性流体对白云岩储层溶蚀作用的模拟实验 |
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佘 敏1,2, 寿建峰1,2, 沈安江1,2, 贺训云1,2, 朱 吟1,2, 王 莹1,2, 张天付1,2
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(1.中国石油杭州地质研究院,浙江杭州 310023;2.中国石油天然气集团公司碳酸盐岩储层重点实验室,浙江杭州 310023)
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| 摘要: |
| 通过0.2%乙酸与亮晶鲕粒含灰云岩、鲕粒云岩和粉细晶云岩的埋藏溶蚀模拟实验,对埋藏环境下有机酸流体流经白云岩内部对其溶蚀改造作用及其产生的溶蚀效应进行研究。结果表明:3种类型白云岩释放出Ca2+、Mg2+物质的量浓度为(13.19～20.48)×10-3mol/L,随着埋藏深度的增加(温度和压力升高),有机酸对白云岩的溶蚀能力相应降低,但降低的幅度不超过20％;溶蚀后样品的质量平均损失约1％,而孔隙度平均提高5％,渗透率平均增加幅度高达300％;有机酸性流体在深埋条件下仍对白云岩地层具有较强溶蚀性;白云岩经埋藏溶蚀后其内部孔隙和喉道溶蚀加大,并相互连通,导致孔喉体积增加、数量降低,这对渗透率的提高具有异常明显的效果,从而有利于油、气的储集与运移。 |
| 关键词: 白云岩 内部溶蚀 模拟实验 岩石物性 微观溶蚀特征 |
| DOI：10.3969/j.issn.1673-5005.2014.03.002 |
| 分类号:P 599 〖HTH〗 |
| 基金项目:国家油气专项(2011ZX05004-002) |
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| Experimental simulation of dissolution and alteration of buried organic acid fluid on dolomite reservoir |
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SHE Min1,2, SHOU Jian-feng1,2, SHEN An-jiang 1,2, HE Xun-yun1,2, ZHU Yin 1,2, WANG Ying 1,2, ZHANG Tian-fu1,2
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(1.Hangzhou Institute of Geology, PetroChina, Hangzhou 310023, China;2.Key Laboratory of Carbonate Reservoir, CNPC, Hangzhou 310023, China)
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| Abstract: |
| In order to study the processes and effects of dolomite dissolution by organic acid under burial environment, the reactions of acetic acid (initial 0.2%) with sparry oolitic ash dolomite, sparry oolitic dolomite, and silty-fine dolomite were investigated using continuous flow diagenesis simulation system. The results show that the total amount of Ca2+、Mg2+ released from dolomite is (13.19-20.48)×10-3mol/L. The dissolution quantities of dolomite reduce with the increase of burial depth. The weight lost of the samples on average is about 1％.The average porosity increases by 5％, and the average permeability rises as high as 300％. The results also indicate that the organic acid can still exist in deep burial environment, and it can also strongly dissolve dolomite. The internal pores and throats of dolomite are corroded to enlarge and interconnect, resulting in increased bulk volume of pores and throats but decreased total amount. Burial dissolution effect is significant, especially in permeability property. Inter-crystal and intra-crystal dissolution pores develop in dolomites, and the dolomites are eroded into honeycomb-like pores on the rock surface. The inter-crystal fractures of dolomite are enlarged by dissolution and become interconnected. The micro-corrosion characteristics of dolomite are beneficial to the accumulation and migration of oil and gas. |
| Key words: dolomite internal corrosion simulation experiment physical properties of rocks micro-corrosion characteristics |
