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鄂尔多斯盆地中部地区致密砂岩储层敏感性及损害机理 预览

Sensitivities and damage mechanisms of the tight sandstone reservoir in Central Ordos Basin
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摘要 致密砂岩储层因其具有低孔、低渗、黏土矿物多样以及孔隙结构复杂等特点,在勘探开发过程中比较容易造成严重的储层损害。以鄂尔多斯盆地中部地区M油田致密砂岩储层为研究对象,在岩石学特征、物性特征以及孔隙结构特征研究的基础上,开展了储层敏感性评价,并分析了敏感性损害的机理。结果表明:致密砂岩储层具有中等偏弱速敏、强水敏、强盐敏、弱—中等偏弱碱敏、无酸敏—弱酸敏以及强应力敏,敏感性损害的强弱程度依次为水敏、应力敏、盐敏、速敏、碱敏、酸敏;敏感性损害机理主要与黏土矿物组成和孔隙结构有关,其中伊/蒙混层和蒙脱石的含量较高是形成强水敏和强盐敏的最主要因素,高岭石的存在是引起速敏的主要因素,绿泥石的存在使部分岩样呈弱酸敏性,石英颗粒及铝硅酸盐矿物的溶蚀是造成碱敏的最主要原因,孔隙结构复杂、片状喉道易受力变形、黏土矿物的强度较弱以及有效应力改变是储层具有强应力敏的主要原因。研究结果可为目标区块及同类型致密砂岩储层的高效勘探开发提供参考。 Because of the low porosity, low permeability, various clay minerals, complex pore structure and so on, tight sandstone reservoir is easy to cause serious reservoir damage in the process of the exploration and development. Taking the tight sandstone reservoir of Oilfield M in Central Ordos Basin as the research object, on the bases of the studies on the petrological characteristics, physical properties and pore structure characteristics, the reservoir sensitivity evaluations were carried out, and moreover the mechanisms of the sensitivity damage were analyzed. The results show that the tight sandstone reservoirs have medium to weak velocity sensitivity, strong water sensitivity, strong salt sensitivity, weak to medium alkali sensitivity, no acid sensitivity to weak acid sensitivity and strong stress sensitivity, the degrees of the sensitivity damage are the water sensitivity > the stress sensitivity > the salt sensitivity > the speed sensitivity > the alkali sensitivity > the acid sensitivity;the sensitivity damage mechanisms are mainly related to the clay mineral composition and the pore structure, among them, the rather higher contents of the illite/montmorillonite mixed formation and montmorillonite are the most important factors to form the strong water sensitivity and strong salt sensitivity, the presence of the kaolinite is the main factor to cause the velocity sensitivity, the presence of the chlorite makes the partial rock samples show weak acid sensitivity, the dissolutions of the quartz particles and aluminosilicate minerals are the most main causes of the alkali sensitivity, the complex pore structure, easy-to-deform sheet throat, weaker clay mineral strength and effective stress change are the main reasons for the reservoir with strong stress sensitivity. The study results can provide the references for the high-efficiency exploration and development of the target block and similar tight sandstone reservoirs.
作者 吕佳蕾 吴因业 LU Jialei;WU Yinye(PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China)
出处 《大庆石油地质与开发》 CAS CSCD 北大核心 2019年第3期167-174,共8页 Petroleum Geology & Oilfield Development in Daqing
基金 国家油气专项006课题“致密油富集规律与勘探开发关键技术”(2016ZX05046-006)。
关键词 致密砂岩储层 敏感性 损害机理 储层特征 鄂尔多斯盆地 tight sandstone reservoir sensitivity damage mechanism reservoir characteristic Ordos Basin
作者简介 吕佳蕾,女,1994年生,在读硕士,从事石油地质学和层序地层学研究。E-mail:543500728@qq.com.
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