构造裂缝定量预测的一种新方法──二元法

A NEW METHOD FOR QUANTITATIVE PREDICTION OF TECTONIC FRACTURESTWOFACTOR METHOD

构造裂缝定量预测技术是目前裂缝性油藏在勘探和开发中迫切需要解决的一个问题。以吐哈盆地中的丘陵油田作为研究实例，分别采用岩石破裂法和能量法，对油田储集层中构造裂缝的发育情况进行了数值模拟。研究表明，岩石破裂法的结果与能量法的结果可互为补充。在此基础上提出了由破裂值及能量值共同决定构造裂缝发育程度的新方法，称之为二元法。按此方法给出了破裂值、能量值与裂缝密度值之间关系的拟合公式。将此公式计算出的裂缝密度预测值与该地区１６个井段的裂缝密度观测值进行对比，其中１２个井段处的相对误差不超过２５。根据拟合公式。

Abstract The quantitative prediction technique of tectonic fractures is an urgent subject in the exploration and development of fractured reservoirs.In the present paper,rock fracture method and energy method are used to simulate tectonic fracture development in Qiuling Oilfield of TurpanHami Basin.The results from both the rock fracture method and the energy method are complementary each other.Thus,a new methodtwo factor method is proposed to simulate the development of tectonic fractures by means of fracturs value and energy value together.According to this method,a fitting formular predicting the fracture density through calculating fracture value and strain energy is given.A comparison of the predicted fracture densities with the corresponding observed ones of 16 wells was made,the results show that the relative errors of 12 wells are less than 250/0.On this basis,the predicted diagrams showing the density distribution of tectonic fractures within the producing formations of the Qiuling Oilfield are presented.