致密砂岩储层压实-胶结作用演化路径力学分析

发布时间：2018-08-17 14:29

【摘要】：致密砂岩储层成岩演化过程中,压实及胶结作用对储层性质具有极为重要的影响,探讨致密砂岩储层压实-胶结作用演化路径,对恢复地质历史时期致密储层孔隙演化及制定合理勘探开发方案具有重要参考价值。基于此,本文重点探讨了致密砂岩储层压实及胶结作用演化路径及相应岩石力学性质变化特征。研究结果表明,成岩演化早期,岩石物性及力学性质变化主要受压实作用影响,胶结作用不显著;而成岩晚期压实作用对岩石物性及力学性质变化的影响较小,此时胶结作用起最主要的影响作用。随着成岩作用的进行,致密砂岩内部孔隙逐渐均一化,并且有趋近于圆形的趋势。剥蚀过程中地层岩石应力的降低幅度要大于沉积过程中地层岩石应力的增加幅度。因此,对于发生过强烈剥蚀作用的沉积盆地,其内部发育的致密砂岩储层往往具有相对好的物性条件及油气开发潜力。致密砂岩压实-胶结作用演化过程中伴随着孔隙度及力学性质的变化,深入探讨其相互间作用关系,可以为致密砂岩储层评价及甜点区预测提供参考。
[Abstract]:In the diagenetic evolution of tight sandstone reservoir, compaction and cementation play an important role in reservoir properties. The evolution path of compact-cementation in tight sandstone reservoir is discussed. It has important reference value for recovering pore evolution of tight reservoir during geological history period and making reasonable exploration and development plan. Based on this, the evolution path of compaction and cementation of tight sandstone reservoir and the change characteristics of corresponding rock mechanical properties are discussed in this paper. The results show that in the early stage of diagenetic evolution, the changes of physical and mechanical properties of rocks are mainly affected by compaction, but the cementation is not significant, but the effect of compaction in late diagenesis on the changes of physical and mechanical properties of rocks is relatively small. At this point, the cementation plays the most important role. With diagenesis, the internal pores of tight sandstone are gradually homogenized and tend to be round. The decrease of formation rock stress in denudation process is larger than that of formation rock stress increase in sedimentary process. Therefore, for sedimentary basins with strong denudation, the tight sandstone reservoirs developed within the basins often have relatively good physical properties and potential for oil and gas development. The evolution of compact-cementation of tight sandstone is accompanied by the change of porosity and mechanical properties. The relationship between compactness and cementation can be discussed in depth, which can be used as a reference for the evaluation of tight sandstone reservoir and prediction of desserts area.
【作者单位】：中国地质大学能源学院;中国地质大学海相储层演化与油气富集机理教育部重点实验室;页岩气资源战略评价国土资源部重点实验室;西安石油大学地球科学与工程学院;
【基金】：国家自然科学基金项目(41372139、41072098) 国家科技重大专项专题(2011ZX05018-001-002、2011ZX05009-002-205、2011ZX05033-004)
【分类号】：P618.13

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