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塔中低凸起北斜坡奥陶系碳酸盐岩储层特征及其勘探意义

Keywords: 塔中低凸起,走滑断裂,同沉积逆断裂,岩浆热液,岩溶塌陷,台内滩,缝洞系统

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Abstract:

?塔中地区的构造演化史大致为:中加里东旋回晚期,塔中演化为前陆盆地的前缘隆起,形成了鹰山组顶部历时约12.8ma的风化壳,nw走向的塔中ⅰ号断裂带及相关次级断层开始活动,并伴随右行压扭,而且具有同沉积性质,控制了良里塔格组碳酸盐岩的生长,形成了桑塔木组和良里塔格组之间的淹没不整合;晚加里东运动期—早海西运动期,ne走向的右行走滑断裂继续活动;到二叠纪时期,塔里木盆地火山活动频繁,在塔中47井以及塔中35井区形成了两个规模较大的岩株,并伴随有nw走向的岩浆侵入。伴随构造演化过程在奥陶系碳酸盐岩中形成了三种受构造影响的储层类型——与走滑断裂相关的岩溶塌陷储集体、与同沉积逆断裂相关的良里塔格组台内滩储层、与岩浆热液相关的储集体。构造活动是形成碳酸盐岩优质储层的基础,这三类储集体是不同构造活动的不同表现形式,它们在时间上继承,在空间上叠置甚至重合,相互影响,最终形成一种相对独立的碳酸盐岩岩溶缝洞系统,具有重要的勘探价值。

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