鄂尔多斯盆地湖盆区延长组致密油“甜点”控制因素及预测方法

发布时间：2018-01-06 06:36

本文关键词：鄂尔多斯盆地湖盆区延长组致密油“甜点”控制因素及预测方法　出处：《地质科技情报》2017年04期 　论文类型：期刊论文

【摘要】：鄂尔多斯盆地湖盆区中生界延长组广泛发育致密油储层。对测井、岩心以及地震资料的综合研究表明:含油性主要受到烃源岩厚度与储层层位、平面位置的控制。烃源岩厚度越大,则其上覆储层含油性越好;湖盆华池、庆城一带致密储层自长61至长72越接近烃源岩,其含油性越好。致密油碎屑岩储层与围岩地震波阻抗差异较小,应用常规地震勘探方法较难识别。采用叠前反演、叠后反演、叠后能量衰减等多种地震方法进行了试验研究。结果表明:叠前纵波阻抗以及λρ参数反演可以较好地反映含油砂岩成层性和叠置性;叠后密度反演与叠前反演结合,可以在平面上判断不同时期含油砂体平面展布范围;分频衰减技术在剖面上可以较好地区分油层和干层,油层的调谐振幅频率往往比干层小5~10Hz,通过分频体相减的方法可以在平面上判断含油砂岩分布范围。
[Abstract]:Dense oil reservoirs are widely developed in the Mesozoic Yanchang formation in the lake basin area of Ordos Basin. The comprehensive study of logging, core and seismic data shows that the oil-bearing properties are mainly due to the source rock thickness and reservoir layers. The greater the thickness of the source rock, the better the oil content of the overlying reservoir; The closer the tight reservoir from Chang61 to Chang72 in Huachi Lake Basin and Qingcheng area, the better its oil content. The difference of seismic wave impedance between tight oil clastic rock reservoir and surrounding rock is small. It is difficult to identify by using conventional seismic exploration methods. Prestack inversion and poststack inversion are used. Many seismic methods, such as post-stack energy attenuation, have been tested and studied. The results show that the inversion of prestack P-wave impedance and 位蟻 parameters can well reflect the stratification and superposition of oil-bearing sandstone; The combination of poststack density inversion and prestack inversion can determine the distribution range of oil-bearing sand bodies in different periods on the plane. The technique of frequency division and attenuation can be used to distinguish the reservoir from the dry layer well, and the tuning amplitude frequency of the reservoir is often 5 ~ 10 Hz smaller than that of the dry layer. The distribution range of oil-bearing sandstone can be judged on the plane by subtraction of frequency divider.
【作者单位】：西北大学大陆动力学国家重点实验室;西北大学地质学系;中国石油长庆油田勘探开发研究院;中国石油长庆油田低渗透油气田勘探开发国家工程实验室;
【基金】：国家自然科学基金重大项目(41390451) 长庆油田企业项目
【分类号】：P618.13;P631
【正文快照】： 因素及预测方法李坤白1a,1b,赵玉华2a,2b,蒲仁海1a,1b,张杰2a,2b,徐鹏晔1a,1b,张盟勃2a,2b(1.西北大学a.大陆动力学国家重点实验室;b.地质学系,西安710069;2.中国石油长庆油田a.勘探开发研究院;b.低渗透油气田勘探开发国家工程实验室,西安710018)致密油是继页岩气之后全球非常

【参考文献】