南美W油田T5B砂岩储层预测综合研究

南美W油田T5B砂岩储层具有横向上岩性变化快、垂向上多套薄砂体叠置等特点,对其进行识别和描述难度较大。针对W油田7井区W-7KH井水平段钻探效果不理想以及W-7C井和W-7D井2口井油水关系矛盾等问题,提出了＂平剖相结合＂的储层预测技术思路。首先通过半定量地震振幅解释及叠后约束稀疏脉冲反演方法,建立了T5B砂岩储层厚度与地震均方根振幅的关系,并确定了储层与非储层纵波阻抗数值范围,较好地刻画了T5B砂岩储层的横向展布范围;然后采用高分辨率拟声波阻抗反演方法,有效识别了T5B砂岩内部薄泥岩隔层,描述了砂体的垂向叠置关系,解决了油水界面不统一的矛盾。研究思路和结果对油田下一步的滚动开发、水平井段设计及精细油藏描述具有启发和指导意义。

Research on reservoir prediction of T5B sand in W oilfield, South America

Abstract： TSB sand reservoir in W oilfield of South America has the characteristics of rapid variation of lateral thickness and lithology and complicated vertical overlap relationship. Thus, it is very difficult to identify and characterize TSB sand. This paper carried out integrated researches including semi-quantitative analysis of the seismic RMS amplitude attribute, constrained sparse spike inversion and pseudo acoustic impedance inversion trying to resolve two specific problems such as poor drilling effect of W-TKH horizontal well and oil-water interface confliction between W-TC well and W-7D well. As a result, amplitude and impedance value of effective T5B sand has been established and the boundaries of TSB sand body have been characterized, and the overlap relationship of sand bodies have also been described so as to resolve the oil-water interface conflietion of TSB sand between W-TC well and W-TD well. The research method and result may have good guidance for step out development, horizontal well design and fine reservoir characterization of W oilfield.