水力压裂形成裂缝形态的研究

油层水力压裂形成的裂缝形态与油层是否有天然裂缝和油层所地应力及其相岩石抗张强度有关，本文通过对吉林，大庆油田的水力压裂形成缝形形态研究，认为油层构造是压裂所形成缝形形态的重要条件，但油层三向应力是决定因素，进一步研究认为同一时代地层的地应力的相对大小的关系是固定的，不因地层埋藏深度而变迁。

A STUDY ON THE FRACTURE TYPES INDUCED BY HYDROFRACTURING. PED

Fracture geometry of fractures induced by hydrofracturing is affected by the geostress and rock strength in their relative direction and where the natural fracture system is present or not. By a study of the fracture geometry in the bydrofracturing jobs experienced in Jilin and Daqing oil fields, this paper suggests that reservoir rock structure is an important condition of fracture geometry, however, 3-D geostresses in the decisive factor. A futher study shows that the relative magnitude of the geostress in the same formations fairly constant independent to their depth of burial.