不整合地层条件下变差函数拟合相控建模技术

Facies-controlled modeling technology for variation function fitting under unconformity strata condition

张强1,郑丽2,张记刚1,吕建荣1,王晓光1,郑强1,廉桂辉1

Zhang Qiang1, Zheng Li2, Zhang Jigang1, Lv Jianrong1, Wang Xiaoguang1, Zheng Qiang1, Lian Guihui1

1.中国石油新疆油田公司勘探开发研究院 新疆 克拉玛依 834000;2.成都理工大学能源学院 四川 成都 610059

1.Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China; 2.Collegeof Energy, Chengdu University of Technology, Chengdu 610059, China

克拉玛依油田一中区克拉玛依组油藏属洪积扇—辫状河沉积，部分地层呈不整合接触关系，地层由厚变薄直至完全尖灭。由于老井只有标准测井曲线，尖灭地层内井点相对较少，部分井只钻遇克上组，造成井点间属性相关性差、建模难度较大，为精准刻画油层，在实际工作中改进传统建模方法，在构造建模中重新制定了地层格架构建和网格剖分方法。过井剖面质量控制显示，该区射孔数据与网格粗化数据具有艮好的对应关系，网格剖分合理。属性建模过程中，采用随机与确定性相结合的建模思路，用砂砾岩厚度平面图约束井间属性分布，提高了属性数据间的相关性，最终结果模型地质储量相对误差仅为5％，符合规定要求。形成的建模技术路线适用于同类不整合油藏。

Karamay Formation reservoir in No.1 Middle District of Karamay Oilfield belongs to alluvial fan to braided river
deposition and partial strata are unconformity contact with strata from the thick to thin until completely pinching out. The old wells
only have standard logging curves and the strata pinched out have less wells. Some wells only drill into Keshang Formation reservoir,
which leads to poor correlation of well points and the difficulty of geological modeling. In order to accurately characterize reservoir,
the author improves the traditional modeling method in practice. A new method of stratigraphic framework construction and grid
subdivision is formulated in structure modeling. The quality control of well section shows that the perforating data has a good
corresponding relationship with upscaled grid data and the grid subdivision method is reasonable. In the process of property
modeling, the thought of random modeling combines with deterministic modeling and gravel thickness is used to constraint
properties distribution between wells. The correlation among attribute data is improved. The relative error of geological reserves is
modeled to be only 5%, which meets the requirement. The modeling technical route formed in this paper is suitable for the similar
unconformity reservoir.

10.6056/dkyqt201304015