四川盆地元坝中部断褶带须家河组储层构造裂缝形成期次

发布时间：2018-05-05 03:32

  本文选题：裂缝特征 + 形成期次　； 参考：《石油学报》2017年10期

【摘要】：四川盆地元坝中部断褶带须家河组储层属于低孔、低渗储层,裂缝对天然气的富集及产能具有重要影响。综合利用野外露头、岩心、测井、包裹体分析、声发射以及(U-Th)/He年龄测定等,对该区构造裂缝形成期次开展综合研究。研究表明:该区主要发育构造成因的低角度和高角度剪切缝,具有规模中等、宽度小(闭合)、间距大、充填程度不高的特征,裂缝有效性较好;须家河组构造裂缝形成期次共3期(不考虑成岩期裂缝),第Ⅰ期构造裂缝形成于燕山构造运动中—晚期,方位为NE向(30°±5°)、NW向(315°±5°),裂缝被中—细粒方解石充填,充填程度较高,包裹体均一温度为75~85℃,古地应力的最大有效主应力为18.8 MPa;第Ⅱ期裂缝形成于为喜马拉雅早—中期构造运动,方位为NEE向(75°±10°)、SN向(0°±5°),裂缝被粗粒方解石半充填(或未充填),均一温度为150~175℃,古地应力的最大有效主应力为27.9 MPa;第Ⅲ期裂缝形成于为喜马拉雅晚期构造运动,方位为NWW(290°±10°)向,裂缝充填程度低,切割前两期充填裂缝明显,古地应力的最大有效主应力为38.6 MPa;结合地质力学理论,建立了三期裂缝发育的成因模式。
[Abstract]:The Xujiahe formation reservoir in the central fault fold belt of Yuanba in Sichuan Basin belongs to low porosity and low permeability reservoir. Fractures have an important influence on the accumulation and productivity of natural gas. Based on field outcrop, core, logging, inclusion analysis, acoustic emission and U-Thn / he dating, a comprehensive study was carried out on the tectonic fracture formation period in this area. The study shows that the low angle and high angle shear fractures of the main tectonic origin in this area have the characteristics of medium scale and small width (close, large spacing and low filling degree), and the fracture is effective. The tectonic fractures of Xujiahe formation were formed in three stages (excluding diagenetic fractures, the first tectonic fractures were formed in the middle to late Yanshanian tectonic movement, the orientation was 30 掳卤5 掳NW direction in NE direction and 315 掳卤5 掳in NW direction. The fractures were filled with medium-fine calcite, and the filling degree was relatively high. The homogenization temperature of inclusions is 75 ~ 85 鈩，

本文编号：1846021