鄂尔多斯盆地红河油田长8油层组致密砂岩储层“甜点”成因机制

发布时间：2018-11-20 14:56

【摘要】：鄂尔多斯盆地红河油田长8油层组储层物性普遍具有低渗—致密特征,但局部发育储层"甜点"(即相对优质储层),并控制着油气富集高产,因此,开展储层"甜点"成因机制研究对致密砂岩储层预测意义重大。通过大量岩石薄片、铸体薄片、阴极发光、扫描电镜、荧光薄片等的系统观察与统计,结合储层矿物组成、胶结物含量、物性测试分析,从沉积建造到成岩改造开展了储层物性影响因素的全过程分析,剖析沉积、成岩、破裂及油气侵位作用对致密砂岩储层储集性能的影响。结果表明,沉积作用是控制致密砂岩储层物性的第一位因素,奠定了致密砂岩储层发育的物质基础,并控制了其原始物性;成岩作用控制了致密砂岩储层的孔隙演化,其中建设性成岩作用控制了储层"甜点"的发育,并最终控制了孔隙型致密砂岩储层"甜点"分布;裂缝大大提高了致密砂岩储层渗流能力,并最终控制了裂缝—孔隙型致密砂岩储层"甜点"分布;油气侵位抑制了胶结作用的进行,是致密砂岩储层"甜点"重要的保持机制。
[Abstract]:The physical properties of Chang 8 formation reservoir in Honghe Oilfield, Ordos Basin, are generally characterized by low permeability and compactness, but the local reservoir "dessert" (i.e. relatively high quality reservoir) is developed, which controls oil and gas enrichment and high yield. It is of great significance to study the genetic mechanism of reservoir desserts for prediction of tight sandstone reservoir. Through the systematic observation and statistics of a large number of thin rock slices, cast thin plates, cathodoluminescence, scanning electron microscope, fluorescent slices and so on, combined with the reservoir mineral composition, cement content, physical properties test and analysis, From sedimentary formation to diagenetic transformation, the whole process analysis of the influencing factors of reservoir physical properties was carried out, and the effects of deposition, diagenesis, fracture and oil and gas emplacement on reservoir properties of tight sandstone reservoir were analyzed. The results show that sedimentation is the first factor to control the physical properties of tight sandstone reservoir, which lays the material foundation for the development of tight sandstone reservoir and controls its primitive physical properties. Diagenesis controls the pore evolution of tight sandstone reservoirs, in which constructive diagenesis controls the development of "desserts" and finally controls the distribution of "desserts" in porous tight sandstone reservoirs. Fractures greatly improve the percolation ability of tight sandstone reservoirs and ultimately control the distribution of "desserts" in fracture-pore tight sandstone reservoirs, and the migration of oil and gas inhibits the cementation, which is an important retention mechanism of tight sandstone reservoirs.
【作者单位】：中国石化华北油气分公司勘探管理部;中国石化石油勘探开发研究院;
【基金】：国家科技重大专项“中西部重点碎屑岩层系油气富集规律与勘探方向”(2016ZX05002-006)资助
【分类号】：P618.13

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