【摘要】 随着非常规油气藏的规模开发,微地震监测作为该类型油气藏水力压裂体积改造设计、实施及评估的关键技术得到了迅速发展。东营凹陷盐227井区作为低孔特低渗透油藏,在进行整体压裂开发的过程中对微地震监测数据进行了采集与处理。通过微地震事件点俯视投影、沿井轨迹侧视投影、压裂改造体积及压裂波及前缘面积计算等方法,分析了人工裂缝带的长度、宽度、高度和方位等空间发育特征及其影响范围,综合利用钻录井、测井和三维地震等资料,分析了研究区天然裂缝分布特征、各压裂段岩性组合或沉积相带特征及其对人工裂缝空间分布的影响,综合评估了盐227井区非常规油气藏压裂改造效果,明确了砂砾岩扇体中扇中可压性好于扇根;相对厚层的含砾砂岩比厚度较薄、泥岩夹层多的含砾砂岩的压裂效果更好。更多还原

【Abstract】 Micro-seismic monitoring,as a technique for the design,implementation and evaluation of hydraulic fracturing volume reformation,has been developing rapidly with the large-scale development of unconventional hydrocarbon reservoir.The sand-gravel reservoir in Yan227 wellblock of Dongying sag has low porosity and very low permeability. Based on micro-seismic monitoring data acquisition and processing of Well Yan227-3HF and Well Yan227-8HF,the development of artificial fracture space,including its length,width,direction and height,and its effective rang were analyzed at first through the methods of vertical projection of micro-seismic event point,side projection,calculating of fracturing volume and fracturing frontal area,etc. And then data from drilling,logging,well logging,3D seismic and fracturing construction process parameter curve were comprehensive utilized,thus the characteristics of natural fracture distribution,the lithology and sedimentary facies belt of each fracture section and their influence on spatial distribution of artificial cracks were analyzed. Finally,the unconventional hydrocarbon reservoir fracturing effect was evaluated comprehensively in Yan227 wellblock area. The results show that the middle-fan section is easier to be fractured compared with the fan root; pebbly sandstone with relatively thick layer has better fracturing effect than the one with thinner layer and multi-interbedded mudstone.更多还原