基于QC模式提高胜坨地区浊积岩储层预测精度
Improving the Prediction Accuracy of Turbidite Reservoirs in Shengtuo Area Based on QC Model

浊积岩油藏是东营凹陷北带的典型油藏类型，是油气勘探的热点。虽然近些年胜坨地区浊积岩勘探不断取得新进展，但由于该地区受多期次构造运动和古地貌等影响，浊积岩储层沉积类型多样，沉积体系分布及岩性复杂，缺乏有效的地震描述手段，难于对浊积岩储层进行有效地预测。本文采用QC模式将胜坨地区浊积岩储层预测精度作为研究目标，系统全面分析了影响浊积岩储层预测精度的各种因素，确认出沉积相带划分不明确、砂体边界不落实及储层厚度预测不准确3个要因。在此基础上，通过对录井、测井及地震等资料综合分析，制定相应的解决对策，搞清本地区沉积体系类型、展布规律及储层发育的主控因素，总结形成了适合于受灰质岩影响的浊积岩储层的有效识别、边界落实及厚度地震预测的方法和技术流程。该方法实施后，浊积岩储层预测符合率提高到了86.7%，储层厚度预测精度达到了81.1%。从而有效地提高胜坨地区浊积岩油气藏的勘探开发效益。
Turbidite reservoirs are typical reservoir types in the northern zone of the Dongying Sag and hotspots in oil and gas exploration. Although new progress has continuously been made in the exploration of turbidite reservoirs in the Shengtuo area in recent years, due to the influence of multi-stage tectonic movements and paleogeomorphology in this area, the sedimentary types of turbidite reservoirs are diverse, the distribution of sedimentary systems and lithology are complex, and there is a lack of effective seismic description means, making it difficult to effectively predict turbidite reservoirs. In this paper, the prediction accuracy of turbidite reservoirs in the Shengtuo area is taken as the research objective using the QC model. Various factors affecting the prediction accuracy of turbidite reservoirs are systematically and comprehensively analyzed, and three main causes are identified: unclear division of sedimentary facies belts, unconfirmed sand body boundaries, and inaccurate reservoir thickness prediction. On this basis, through comprehensive analysis of logging, well logging, seismic and other data, corresponding solutions are formulated to clarify the sedimentary system types, distribution patterns and main controlling factors of reservoir development in this area, and methods and technical processes for effective identification, boundary confirmation and thickness seismic prediction of turbidite reservoirs affected by calcareous rocks are summarized and formed. After the implementation of this method, the coincidence rate of turbidite reservoir prediction has increased to 86.7%, and the prediction accuracy of reservoir thickness has reached 81.1%. Thus, the exploration and development benefits of turbidite oil and gas reservoirs in the Shengtuo area are effectively improved.