水淹油藏孔隙压力测井评价方法研究

有效地求取地层孔隙压力,是油藏工程必不可少的研究内容,对油气运移成藏研究、油藏物性与剩余油分布预测、井壁稳定性评价、套损预测预报等都具有极其重要的现实意义。本文从注水开发油田套损预测预报工作要求出发,通过现有测井资料预测地层压力方法考察,明确了典型的等效深度法、统计分析法求取水淹油藏孔隙压力不适应的根源所在,提出了原始油藏压实趋势线与统计分析相结合的思路,给出当前水淹油藏孔隙压力计算方法。经4口井RFT测试资料检验,平均绝对误差0.61MPa,为地应力评价、套损预测提供了重要的数据。

EVALUATION METHOD STUDY ON PORE PRESSURE WELL LOGGING IN A WATER FLOODED RESERVOIR

To obtain the formation pore pressures effectively is an essential study content to petroleum reservoir engineering. It has important practical significance for studying migration and oil and gas reservior formation, predicting physical properties and distribution of remaining oil in a reservoir, evaluating hole stabillty and forecasting casing damage, etc. Starting from the requirements of forecasting casing damage in waterflooded oilfields, the combination of representative equivalent depth and statistical analysis is made clear in this paper and the calculation method of pore pressure in a water flooded reservoir is put forward through surveying forecasting formation pressure method with existing logging data. After verifying the RFT test data from 4 wells, its mean absolute error is 0.61Mpa. It can provide important data for ground stress evaluating and casing damage forecasting.