摘要
川东W地区多口井在二叠系茅口组具有不同程度的油气显示,测试产能较高。前人的研究成果认为茅口组属于裂缝型储层,未对白云岩发育层段的特征进行详细研究。根据大量的钻井地质资料,分析总结了茅二a亚段白云岩储层的地质特征,利用90°相移技术在薄地层和岩性解释上的优势,采用川东W地区近年采集的三维地震资料进行不同角度的相移尝试,使地震反射同相轴与岩层相对应,大大提高了储层预测成果的精确度。通过对比实际钻井成果,讨论了不同角度相移对储层预测的影响,并分析了90°相移技术与道积分技术的差异,最终认为90°相移技术适用于川东地区的薄储层解释。
In W area, eastern Sichuan Basin, more or less gas shows appeared from the Permian Maokou Formation. This formation also got higher productivity from oil test. Previous study suggests that it belongs to a fractured reservoir; however no detailed research has been implemented for the dolomites among this reservoir. Based on drilling data, the characteristics of P_1m_a^2, the dolomite reservoir, were summarized. Furthermore, according to 3D seismic data acquired from W area, a phase shifting with different degree was attempted by means of 90° phaseshifting technology, which offers advantages on thin-layer and lithological interpretation. This shifting makes the event of seismic reflection correspond with strata, and increases an accuracy of reservoir prediction a lot. In addition, the effect of phase shifting with different degree on reservoir prediction was discussed, the difference between this technology and trace integration was analyzed. It is deemed that the 90° phase-shifting technology is suitable for interpretation of thin layers in eastern Sichuan Basin.
出处
《天然气勘探与开发》
2016年第4期13-17,共5页
Natural Gas Exploration and Development
关键词
川东地区
海相地层
薄层
三维地震90°相移技术
道积分储层预测
90° phase-shifting technology
early Permian
eastern Sichuan Basin
marine strata
thin layer
trace integration
3D seismic
reservoir prediction
