塔中顺X井区断裂特征及对储层的控制作用

Fault characteristic and reservoir controlling in ShunX well area, central Tarim

王来源 龚伟 刘军 任丽丹 王鹏

Wang Laiyuan Gong Wei Liu Jun Ren Lidan Wang Peng

中国石化 西北油田分公司 勘探开发研究院, 乌鲁木齐 830011

Research Institute of Exploration & Production, SINOPEC Northwest Company, Urumqi, Xinjiang 830011, China

结合区域地质及三维地震资料，对塔中顺X井区断裂期次进行了厘定，并对一系列北东向走滑断裂分析认为，共分三期：加里东早期至加里东中期Ⅰ幕平行高陡的紧闭平移走滑构造，加里东中期Ⅰ幕后至海西早期拉分下凹的雁列式“负花状”构造，海西中-晚期压扭上拱的雁列式“正花状”构造；北东走向的顺X1井、顺X2井和顺X3井3组走滑断裂将研究区分隔成3个北西向分布的左旋走滑带，形成了“左旋走滑”运动学模式的“北东走滑、北西分带”的构造格局，并发现了活动强度相对较弱的北西向隐伏断裂体系。走滑断裂所伴生的裂缝及后期发生的热液活动对碳酸盐岩溶蚀孔洞-裂缝型储层具有一定的控制作用，形成了“串珠”状地震反射特征沿北东向走滑断裂10 km以内（平均3.4 km）区带性分布特点，且存在北东向走滑断裂与北西向隐伏断裂交叉枢纽部位储层最为发育。

Based on regional geology and seismic data, the NE strike-slip faults are developed by the redefinition of fault active period, which shows paralleled high-steep continental strike-slip fault from the Early Caledonian to episode I of the Mid-Caledonian, extensional en-echelon tulip-flower structure during episode I of the Mid-Caledonian to the Early Hercynian period, and compressional en-echelon positive-flower structure during the Mid-Late Hercynian. NE strike-slip and NW zoning of sinistral strike-slip tectonic framework is formed by NE strike-slip fault of wells ShunX1, ShuntuoX2 and ShunX3. Weak NW-striking concealed faults are found in the study area. Cave and fracture reservoirs of carbonate rocks are certain controlled by fractures formed by NE strike-slip faults and following hydrothermal activities, which forms zone distribution of seismic reflection moniliform along NE strike-slip fault within 10 km (3.4 km in average), and most developed in cross position within NE strike-slip fault and weak NW-striking concealed faults.

https://doi.org/10.11781/sysydz2016S1008