摘要
苏里格气田属于低渗透致密砂岩气藏,目的层为上古生界二叠系的石盒子组和山西组,研究区苏53区块采取水平井整体开发。在开发过程中,天然裂缝对水平井开发的控制作用日趋凸显。为了解苏53区块天然裂缝发育特征,进一步指导区块科学、高效开发,以岩心描述和薄片分析等常规方法对苏53区块天然裂缝发育情况进行分析,同时结合研究区测井及岩心资料,运用双侧向电阻率差异法对裂缝产状进行判断,对微裂缝在水压致裂的过程中起到的作用进行了模拟。结果表明:1苏里格气田目的层天然裂缝以显微构造裂缝、晶间缝及颗粒间网状缝等微裂缝为主;2微裂缝多为水平缝和斜交缝;3在后期压裂改造过程中,微裂缝可以改善水压致裂储层物性,提高开发效果,同时也可能由于天然裂缝的引导而造成井间连通。
Sulige gasfield belongs to tight sandstone gas reservoirs with low permeability. Its target strata include Permian Shihezi and Shanxi formations. Horizontal-well development mode is often adopted to Su53 block. However, the control function of natural fractures becomes increasingly prominent during this development.In order to make clear fracture characteristics and maintain an efficient development, the fracture growth of was analyzed by core description and thin-section identification. Based on the logging and core data, the fracture occurrence was estimated by differential method of dual-lateral resistivity. Also, the effects of microfractures on hydraulic fracturing were simulated. Results shows that:(1) natural fractures existing in the target strata are dominated by microfractures, such as micro- structural fracture, intercrystalline fracture, and intergranular map fracture;(2) these microfractures are mainly horizontal and skew fractures; and(3) during the late hydraulic fracturing, the microfractures can improve some physical properties of fractured reservoirs and their development effect, and may lead to interwell connection guided by natural fractures.
出处
《天然气技术与经济》
2016年第1期8-11,81,共4页
Natural Gas Technology and Economy
基金
国家重大专项"低渗
特低渗油气储层相对高产富集区预测技术"(2011ZX05013-001)
关键词
天然裂缝
储层改造
致密气藏
苏53区块
苏里格气田
natural fractures
reservoir stimulation
tight gas reservoir
Su53 block
Sulige gasfield
