录井评价技术在吐哈红台地区“三低”储集层的应用研究

Application of Mud Logging Evaluation in Reservoirs with “Three Low” Characters in Hongtai Area of Tuha Basin

摘要: “三低”储集层具有物性差、低压充注、多期次成藏特征，单层内部油气水分异不明显，纵向上存在多套油气水系统，横向上砂体连通性差，油气水界面不统一等特征，给录井解释评价带来诸多的技术难题。通过对红台“三低”储集层录井存在问题分析，指出三低储集层特征及评价难点，在红台地区开展了“三低”储集层录井综合评价方法研究。从储集层物性、脆性、含油性等方面对区块储集层进行解释评价，建立了红台西山窑组“三低”储集层录井解释图版、解释评价标准和相应的油、气、水层解释评价方法。针对“三低”储集层特点，确立了“常规地质 + 综合(快速色谱) + 定量荧光 + 热解气相色谱+ 核磁共振分析 + X衍射分析”等录井技术配套。为该地区开发“三低”油藏录井解释评价积累一定的实践经验。

Abstract: The reservoirs with three low characters (low porosity, low permeability, and low oil saturation) were characterized by poor physical properties, low pressure charge and multi-stage accumula-tion. In these reservoirs, the difference between oil, gas and water was not clear in a single layer; there existed several sets of oil and water systems longitudinally; sand connectivity was poor laterally; and oil, gas and water contact was not uniform, which induced technical difficulties to the mud logging interpretation. In view of these issues, the difficulties in the reservoir evaluation were pointed out, and a comprehensive logging evaluation method for the reservoirs with “three-low characters” in the Hongtai Area was studied. Reservoirs in the block were interpreted and evaluated from the aspect of physical properties, brittleness and oil-bearing property. Mud logging interpretation chart board, interpretation and evaluation criteria and corresponding interpretation methods for oil, gas and water layer of the reservoirs with “three-low characters” were established. In consideration of the three-low features of reservoirs, the “conventional geology + comprehensive (quick chromatogram) + quantitative fluorescence + pyrolysis gas chromatography + NMR + X-ray diffraction analysis” mud logging package is established, which provides experience for logging interpretation of this kind of reservoir.