高温高压条件下碳酸盐岩溶蚀过程控制因素

发布时间：2018-03-12 20:11

  本文选题：白云岩　切入点：硫酸根　出处：《石油与天然气地质》2017年04期 　论文类型：期刊论文

【摘要】：近年来的油气勘探实践表明深层-超深层碳酸盐岩具有良好的勘探潜力,地层深部碳酸盐岩储层溶解-沉淀过程是制约深层-超深层碳酸盐岩优质储层预测的关键科学问题,对于该过程的研究有助于深入了解油气储集空间孔隙发育机理。通过开展溶蚀-沉淀模拟实验,利用岩相学和地球化学相结合的分析手段查明常温常压到高温高压条件下(~200℃~70 MPa)温度、压力、水岩比、溶液离子等因素对碳酸盐岩溶解-沉淀过程的影响程度和作用机制。实验得到开放系统碳酸盐岩溶蚀窗温度范围为75~150℃,间歇性开放系统碳酸盐岩溶蚀窗温度范围为120~175℃。在开放系统,0.3%CO_2溶液中,方解石溶蚀率明显高于白云石。在半开放系统,0.3%CO_2溶液中,云质灰岩溶蚀率最高。在开放系统,稀硫酸流体中,当温度超过175℃时白云岩溶蚀量超过灰岩,高温条件下硫酸根离子和矿物晶体表面阳离子的络合过程促进了白云岩的溶解。
[Abstract]:The oil and gas exploration practice in recent years shows that deep to ultra deep carbonate rocks have good exploration potential, and the dissolution and precipitation process of deep carbonate reservoir is the key scientific problem that restricts the prediction of deep to ultra deep carbonate reservoir. The study of this process is helpful to understand the mechanism of pore development in oil and gas reservoir space. By means of the combination of petrography and geochemistry, the temperature, pressure and water-rock ratio are determined under the conditions of room temperature and normal pressure to high temperature and high pressure. The influence degree and mechanism of solution ion on the dissolution and precipitation process of carbonate rock are studied. The experimental results show that the temperature range of dissolution window of carbonate rock in open system is 75 ~ 150 鈩，

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