本文選題：裂縫特征 + 形成期次　； 參考：《石油學(xué)報(bào)》2017年10期

【摘要】：四川盆地元壩中部斷褶帶須家河組儲層屬于低孔、低滲儲層,裂縫對天然氣的富集及產(chǎn)能具有重要影響。綜合利用野外露頭、巖心、測井、包裹體分析、聲發(fā)射以及(U-Th)/He年齡測定等,對該區(qū)構(gòu)造裂縫形成期次開展綜合研究。研究表明:該區(qū)主要發(fā)育構(gòu)造成因的低角度和高角度剪切縫,具有規(guī)模中等、寬度小(閉合)、間距大、充填程度不高的特征,裂縫有效性較好;須家河組構(gòu)造裂縫形成期次共3期(不考慮成巖期裂縫),第Ⅰ期構(gòu)造裂縫形成于燕山構(gòu)造運(yùn)動(dòng)中—晚期,方位為NE向(30°±5°)、NW向(315°±5°),裂縫被中—細(xì)粒方解石充填,充填程度較高,包裹體均一溫度為75~85℃,古地應(yīng)力的最大有效主應(yīng)力為18.8 MPa;第Ⅱ期裂縫形成于為喜馬拉雅早—中期構(gòu)造運(yùn)動(dòng),方位為NEE向(75°±10°)、SN向(0°±5°),裂縫被粗粒方解石半充填(或未充填),均一溫度為150~175℃,古地應(yīng)力的最大有效主應(yīng)力為27.9 MPa;第Ⅲ期裂縫形成于為喜馬拉雅晚期構(gòu)造運(yùn)動(dòng),方位為NWW(290°±10°)向,裂縫充填程度低,切割前兩期充填裂縫明顯,古地應(yīng)力的最大有效主應(yīng)力為38.6 MPa;結(jié)合地質(zhì)力學(xué)理論,建立了三期裂縫發(fā)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 擄鹵5 擄NW direction in NE direction and 315 擄鹵5 擄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，

本文編號：1846021