石平舟 1,王振宇 1,东玉 2 ,范坤宇3
Shi Ping-zhou1,Wang Zhen-yu1,Dong Yu2,Fan Kun-Yu3
摘要: 塔里木盆地塔中东部地区晚奥陶世良里塔格组发育台缘礁。通过单井镜下薄片观察及礁相对比剖面发现,纵向上发育2~4个礁生长旋回,单个旋回厚度为30~80m,横向可对比性较好。根据可容空间变化与礁生长关系,将礁划分为退积礁、进积礁、并进礁3种类型,即:①垂向可容空间增加,即相对海平面上升速度大于礁生长速度时,形成退积礁;②垂向可容空间减少,即相对海平面上升速度小于礁生长速度时,形成进积礁;③垂向可容空间不变,即相对海平面与礁生长动态平衡,形成并进礁。并分别建立了3种礁的识别标志及与可容空间的耦合关系和成因模式:①退积礁,测井曲线表现为自然伽马(GR)低值,深双侧向测井均表现为近平直状,造礁生物以管孔藻,块状、枝状和板状珊瑚及苔藓虫为主,多发育于高水位沉积早期,台地向陆地迁移时期;②进积礁,测井曲线表现为自然伽马(GR)中—低值,深双侧向测井均表现为低值,造礁生物以海百合、浮游介形虫、隐藻等为主,多发育于高水位沉积晚期,海平面下降或静止时,台地边缘向盆地方向迁移,礁体层位逐渐抬高;③并进礁,测井曲线上表现为自然伽马(GR)低值,深浅双侧向测井表现为中高值;造礁生物以腹足类、棘皮类等及藻类为主,并进礁多发育于高水位沉积中期,台地边缘向两侧发生迁移,台缘宽度变大。
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