鄂爾多斯盆地紅河油田長8油層組致密砂巖儲層“甜點”成因機(jī)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.
【作者單位】: 中國石化華北油氣分公司勘探管理部;中國石化石油勘探開發(fā)研究院;
【基金】:國家科技重大專項“中西部重點碎屑巖層系油氣富集規(guī)律與勘探方向”(2016ZX05002-006)資助
【分類號】:P618.13
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