塔中地区奥陶系碳酸盐岩颗粒滩储层的识别

Recognition of the carbonate rock reef-bank reservoir of the Ordovician in Tazhong area

塔中地区是我国西部重要的油气聚集区,勘探成果显示,塔中地区海相碳酸盐岩具有良好的油气勘探前景,但碳酸盐岩储层非均质性极强,预测难度大。以礁滩储集体特征识别、类型划分为目的,应用储层地质学、测井地质学等理论方法对奥陶系颗粒滩储层作详细研究。通过成像测井溶蚀孔洞识别和裂缝统计,在储层基本特征研究的基础上,综合岩相、裂缝、岩溶等多方面的研究成果,运用多因素叠合分析的方法,开展对奥陶系碳酸盐岩储层的识别与评价。

Tazhong area is an important hydrocarbon accumulation area in the west of China. Exploration result show that the marine facies carbonate rocks have favorable oil and gas exploration prospect in Tazhong area, but the carbonate rock reservoirs are hard to be predicted as they have very strong heterogeneity. Taking the feature recognition and type division of the reef-bank reservoir rock body as target, the carbonate rock reef-bank reservoirs of the Ordovician are finely researched by reservoir geology, logging geology and so on. Through the recognition of dissolution cave with FMI logging and the statistics of fracture and based on the comprehensive analysis of basic feature of the reservoir, the carbonate rock reef-bank reservoir of the Ordovician are recognized and evaluated by multi-factor comprehensive analysis combined with the results of the facies, fracture, karstification and so on.