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- Title
致密砂岩微观非均质性定量评价方法研究 ——以鄂尔多斯盆地华庆地区延长组长 6 油层组为例.
- Authors
陈朝兵; 付玲; 陈新晶; 张涛; 解宇航; 王泓波; 朱玉双
- Abstract
The Chang-6 Reservoir in the Huaqing area is a tight sandstone reservoir resulting from deepwater gravity flow. It is generally compact, with high heterogeneity, resulting in very difficult microscopic evaluation and a poor water-flooding effect. In this study the characteristic heterogeneity parameters were selected from three aspects: rock skeleton particles, diagenesis and pore throat structures. Then conventional experimental methods were employed, including grain-size analysis, cast thin-section identification, mercury injection capillary pressure testing and a true two-phase sandstone seepage modeling, to obtain the standard deviation of grain size (σ) for describing the heterogeneity of skeleton particles, filling index (C) and corrosion resistance index (K) to determine the diagenesic heterogeneity, and ractal dimension (D) to determine the heterogeneity of pore throat structures. Based on these three parameters, a comprehensive microscopic heterogeneity index (F) was developed and modeled; 0.2 ≤ F ≤ 3.0, where the higher values indicate poorer sorting of skeleton particles of reservoir, stronger diagenesis, more complex pore-throat structure, and greater microscopic heterogeneity. The true sandstone model simulated oilfield water-flooding. The results showed that the proposed index F accurately described the difference in microscopic properties of the reservoir in dense regions of pores, and good correlation was found between F and oil displacement efficiency in the anhydrous and final periods. This indicates that F may be used to quantitatively evaluate the internal microscopic heterogeneity of tight sandstone reservoirs and predict the distribution of remaining oil, providing a scientific basis for exploration and development of deepwater tight sandstone reservoirs.
- Publication
Acta Sedimentologica Sinica, 2021, Vol 39, Issue 5, p1086
- ISSN
1000-0550
- Publication type
Article
- DOI
10.14027/j.issn.1000-0550.2021.037