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OALib Journal期刊
ISSN: 2333-9721
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库车前陆盆地秋里塔格构造带东、西段构造变形与储层物性的差异性
Keywords: 构造变形,构造沉降,差异性,储层物性,秋里塔格构造带
Abstract:
？根据地震剖面解释和平衡剖面分析，库车前陆盆地秋里塔格构造带东段盐下地层的构造变形强度大于西段，东段的构造变形缩短率为13%~25%，形成了断层相关褶皱、叠瓦构造、双重逆冲构造等构造样式;西段的构造变形缩短率小于10%，形成了背冲构造、台阶状构造等断块构造。利用回剥原理，采用盆地模拟技术分析表明，东段的沉降速率大于西段。构造变形和沉降速率的差异性对储层成岩作用和物性产生了重要影响。东段的构造变形强，沉降速率大，储层的深埋时间长，导致储层的成岩作用强，处于中成岩a2—b期，储层的视压实率为37%~64%，储层物性较差;但强烈的构造作用造成裂缝发育，裂缝的存在提高了低渗透储层的渗透性能。西段的构造变形相对较弱，沉降速率较小，储层的浅埋时间较长，造成储层的成岩压实作用较弱，处于中成岩a1—a2期，储层的视压实率为24%~55%，储层物性相对较好。构造—成岩作用是影响库车前陆盆地秋里塔格构造带低渗透储层物性差异的关键地质因素。
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