摘要
选取差储层排替压力差、异常孔隙流体压力、异常含气浓度和断层封闭性、泥质岩单层厚度、沉积环境分别作为泥质岩盖展微观封闭能力和宏观展布的评价指标．通过对其进行等级划分，赋存权值，并根据其在泥质岩盖层中的发育特征及其对封盖性能的影响程度对其进行权重分配，再利用加权平均法计算泥质岩盖层封盖性能综合评价仅值大小．探讨了泥质岩盖层封盖性能的综合评价方法，并将其应用于大庆长恒及其以西地区嫩二段泥岩盖层封盖性能的综合评价中，其结果与该区实际地质条件十分吻合，证实了该方法的可行性。
The displace pressure difference between caprock and reservior, abnormal pore fluid presure, abnor mal gas-bearing c0ncentration, sealing ability of faults, thickness of mudstone, and depositional environment were choosed as parameters in evaluating the microcosmic sealing ability and macroscopic distrlbution of mudstone caprocks. By grading and weighting of the parameters, in accordance with their development and efficiency, the weight for comprehensive evaluation of sealing ability of mudstone caprock was calculated by weighted average method. It was applied to evaluate the sealing ability of mudstone caprock in member N2 of Daqing placanticline and the area to its west. The result was consistent to the actual geological conditions in the region. It indicated that the method was practical for evaluation of mudstone caprock.
出处
《石油实验地质》
CAS
CSCD
北大核心
1998年第1期80-86,共7页
Petroleum Geology & Experiment
