车21井区裂缝性油藏地质建模与工程设计一体化研究

为研究车21井区人工裂缝在地层中与天然裂缝沟通情况及裂缝真实展布形态,实现车21井区石炭系裂缝性油藏的经济有效开发,基于地质工程一体化研究思路,在建立储层真三维空间模型基础上,考虑油藏在纵向上岩性的展布和平面属性分布的非均质性,在真三维岩石力学储层中进行压裂裂缝模拟,形成了从地质建模到裂缝模拟的一体化研究流程。结果表明:真三维地质力学模型可真实表征储层岩石力学性质,CHHW2101、CHHW2102井的平均最小水平主应力分别为22.0 MPa和26.0 MPa,与2口井的井底停泵压力23.0 MPa与27.0 MPa相吻合。真三维裂缝模拟技术可更高效、更精准、更直接地对裂缝模拟效果进行评价,判断与天然裂缝连通情况。研究结果可为车21井区后续压裂井提供理论和技术支撑,填补中国国内一体化压裂的空白。

On Integration of Geological Modeling and Engineering Design of Fractured Oil Reservoirs in Well Block Che21

To study the connection between artificial and natural fractures in the formation and the actual fracture distribution pattern in Well Block Che21, and to realize the economic and effective development of Carboniferous fractured oil reservoirs in Well Block Che21, an integrated research procedure from geological modeling to fracture simulation was developed on the basis of the idea of integrated geological engineering research and the establishment of a real 3D spatial model of the reservoir, taking into account the longitudinal lithologic distribution and the non-homogeneity of plane attribute distribution in the reservoir. The results showed that the real 3D geomechanical model could realistically characterize the mechanical properties of reservoir rocks, and the average minimum horizontal principal stresses of Wells CHHW2101 and CHHW2102 were 22.0 MPa and 26.0 MPa respectively, which are consistent with the downhole pressure 23.0 MPa and 27.0 MPa of the two wells after pump shutdown. The real 3D fracture simulation technology can evaluate the fracture simulation results more efficiently, accurately and directly, and judge the connectivity with natural fractures. The study results can provide theoretical and technical support for subsequent fractured wells in Well Block Che21, filling the gap of integrated fracturing in China.