喇嘛甸油田北北一区沉积相地震反演

Application of seismic inversion in sedimentary mirofacies study　of North?鄄North One Block, Lamadian Oilfield, Daqing Placanticline

 陈方文 卢双舫 丁雪 吴逸豪 苑丹丹

 中国石油大学（华东）非常规油气与新能源研究院，山东 青岛 266580

Chen Fangwen, Lu Shuangfang, Ding Xue, Wu Yihao, Yuan Dandan

 大庆长垣地区作为大庆油田的主产区已经持续开采50余年，目前已经进入高含水开发阶段。浅层的主力油层河道砂体发育、物性好、含油饱和度高。河道砂体类型包括辫状河道、曲流河道、高弯度分流河道和低弯度分流河道等。为了进一步挖潜剩余油，需要对砂体展布特征开展精细研究。以大庆长垣喇嘛甸油田北北一区为例，开展了地震反演指导沉积微相研究。在地震合成记录和地震反射层位精细解释的基础上，结合井点各沉积单元厚度，按照各沉积单元在深度域中的厚度百分比与时间域中的厚度百分数近似相等的原则，搭建精细三维沉积单元界面格架，以沉积单元作为分析时窗提取各沉积单元地震反演属性，分析井点处沉积单元反演属性值与砂岩有效厚度的关系，预测井间沉积微相分布。从沉积微相平面图可以确定主要的含油砂体展布特征和连通关系，进一步合理配置油水井的注采关系。

 The main oil-producing area of Daqing Oilfield has been developed for more than fifty years, now the water cut is pretty high. A lot of channel sand bodies deposited in the middle-shallow reservoirs of Daqing Placanticline, which are of high porosity, permeability, and oil saturation. The types of channel sand bodies are sandy braided channel, meander channel, high sinuosity channel and low sinuosity channel. For further exploration of remaining oil, the distribution characteristics of channel sand body should be researched. The North-North One Block of Lamadian Oilfield in Daqing Placanticline is selected as an example for using seismic inversion to research sedimentary microfacies. Based on seismic synthetic and seismic reflection horizons interpretation, combining with every sedimentary unit thickness in well and according to approximation of the thickness percentage of every sedimentary unit in depth domain to the thickness percentage in time domain, three-dimensional fine sedimentary unit interface framework is built. The sedimentary unit is selected as analysis time window to extract seismic inversion attribute. The relationships of seismic inversion attribute values and sandstone effective thicknesses are analyzed. The distribution of sedimentary microfacies is predicted. The main sand bodies and connection are identified according to the sedimentary microfacies plan, injection/production ratio can be reasonably decided.

10.6056/dkyqt201504004