【摘要】 随着油气勘探开发不断进行,目标油气田构造越来越复杂,然而当下商业建模软件对复杂构造的表达均不够理想,大多选择简化处理,误差较大。基于此,通过研究对Cookie-cutter和Stair-Step算法进行了改善,引入地质界面的无限切平面,通过切割求交等处理,实现了对大部分复杂构造的表达,包括逆断层、盲断层、多级Y断层、多级λ断层、尖灭等。网格模型单元格保持六面体形态,地质界面以"近阶梯"形式表达。一方面误差较小,构造描述精细;另一方面网格正交性较好,有利于油藏数值模拟计算。此外,算法对断层面、地层面、不整合面等地质界面采用无差别处理,逻辑简单,易于实现。为验证算法可行性,对局部复杂构造数据进行了剖分,网格质量较好。更多还原

【Abstract】 As the continuous exploration and development of oil and gas resources,the geological structure of target oil andgas field become more and more complicated. However,the commercial modeling softwares are not ideal,most of which simplify thecomplex structure and then model it,having a large error. Based on the Cookie-cutter and Stair-Step algorithm,a new hexahedrongrid was proposed. This approach introduced the infinite tangent plane,and expressed the geological interface with"nearStair-Step". On one hand,almost all the complex structure can be modeled,including reverse fault,blind fault,multi-Y faults,multi-λ faults,pinch-out and so on. On the other hand,cells preserve hexahedron and have a good orthogonality,which is favor-able to calculate. Further more,the geological interfaces of fault,layer and unconformity are treated with the same method,lowingthe algorithm complexity and easy to implement. The algorithm was verified with the local data of complex structure. The results arein line with expectation and meet the requirement.更多还原