应用测、录井资料联合识别渤南洼陷滩坝砂岩沉积微相

渤南洼陷滩坝砂岩分布广泛,其特点是物性变化大、非均质性强,大部分为砂泥岩薄互层,甚至有些是致密层,油气勘探难度大。滩坝砂岩沉积微相与储层物性有较大相关性,通过微相的识别有助于判断储层性质。识别滩坝砂岩沉积微相的方法通常是从地质角度、方法来划分和识别,该方法要求资料比较多、数据量大。尝试用联合测井曲线和录井岩性划分微相,提取曲线数值和形态,最后根据曲线数值、形态和岩性准确判别滩坝砂岩沉积微相,建立滩坝砂岩标准微相库,新的测井曲线可以根据提取的测井曲线数值、形态数值和岩性对照标准微相库进行识别。该方法在渤南洼陷的应用取得了良好的效果。

Distinguishing sedimentary microfacies of sandy beach and bar in Bonan oil by logging and well logging material

Sandy beach and bar widely distribute in Bonan sag, characterized by diverse physical property and strong heterogeneity. Most of they are thin layers of sandstone spaced by thin layers of mudstone, some of them are dense layers. The exploration is very difficult. Reservoir physical properties are closed related to Sedimentary microfacies of sandy beach and bar, So distinguishing sedimentary microfacies of sandy beach and bar contributes to estimate reservoir physical properties. Sedimentary microfacies are distinguished normally by geology means, which requiring much material. This paper attempts to distinguish sedimentary microfacies of sandy beach and bar by combining with geology and logging and well logging, and extracts characteristic value and shape of logging curve of different sedimentary microfacies, finally establishes database of distinguishing standard. Then according to this standard, sedimentary microfacies of sandy beach and bar can be distinguished by only logging curve and logging lithology. The method was applied to Bonan sag, and obtained good effect.