特低渗-超低渗储层试油产能预测综合分析方法

Comprehensive Analysis Method of Testing-for-Oil Productivity Forecast of Extra-LowmUltra-Low Permeability Reservoirs

针对HQ地区滑塌浊积扇储层受多期沉积、成岩及构造等因素影响，形成了该区广为发育相对高孔低渗、中孔低渗和低孔低渗并存复杂孔隙结构超低渗透储层流动层带，影响储层渗流和产能因素很多。利用超低渗透储层质量及其渗流结构最重要的孔渗关系，提出储层合理产能参数、储层质量指标、流动层带指标、储能参数、油层有效厚度、渗透率、单渗砂层能量厚度、含油饱和度及其泥质含量综合评价储层试油产能。依据灰色理论油气试油产能预测的分析方法及评价准则．利用不同角度计算的试油产能评价参数及其分类参数指标准确率、分辨率权衡提取超低渗透储层质量、渗流及产能信息．对该区41口井47个试油层段进行了试油产能预测检验，36口井42个试油产能评价预测结果与试油产能结果相吻合，试油产能预测符合率达到89.3％．从而有效地克服了渗流机理不符合达西产能预测方法和流动层带局部参数不能准确表征复杂渗流特征造成产能评价的失误，最大限度地提升了超低渗透储层试油产能预测的定量评价能力．为该类特低一超低渗透储层产能预测提供出十分有效的信息和分析方法。

As the slide turbidite fan reservoirs in HQ area has been under the influence of a number of sedimentary, diagenetic antt tectonic factors over the many periods, the ultra-low-permeability flow zones of high-porosity low-permeability, moderate-porosity low-permeability and low-porosity low-permeability and complicated porosity structures, have been widely developed in this area and there are many factors affecting the reservoir flow and well performance. Utilizing the porosity-permeability relation, which is the most important index of the quality and flow structure of the uhra- low-permeability reservoir, the reasonable performance parameters, reservoir quality indexes, flow zone indexes, reserve capacity parameters, oil layer effective thickness, permeability, energy thickness of single-permeability sand bed, oil-bearing saturation and shale content of the reservoir have been put forward to comprehensively evaluate the productivity in production test. Based on the analytic methods and evaluation criteria of Grey Theory oil/ gas productivity prediction during production test, the information on the quality, flow and performance of the uhra-low-permeability reservoir has been extracted through balancing the ratio of accuracy and resolution of the productivity parameters and divisional indexes which are calculated from different perspectives, and 47 tested zones of 41 wells have been verified against the predication of productivity in production test. 42 productivity e- valuation and predication results of 36 wells are consistent with the actual results of production test, the consistency rate of productivity prediction reaches 89.3%. Thus the performance evaluation error, which is caused by the inconsistency of flow mechanism with Darcy performance prediction methods and when the local parameters of the flow zone cannot accurately manifest the complicated flow characteristics, has been overcome, and the ability to quantitatively evaluate the production test performance prediction of the uhra-low-permeability reservoir has been promoted to the maxinum extent, providing valuable information and analytic methods to the performance predication of extra-low--ultra-low permeability reservoirs.