土库曼斯坦阿姆河盆地卡洛夫—牛津阶沉积相特征

以岩心描述、薄片和古生物鉴定为依据,结合测井相和地震相特征和区域构造-沉积背景,对土库曼斯坦阿姆河盆地卡洛夫—牛津阶沉积相特征进行研究,确定该地层单元属于碳酸盐台地沉积体系,识别出蒸发台地、局限台地、开阔台地、台地边缘礁滩、前缘缓斜坡、盆地等6种沉积相类型。以连井沉积相剖面对比、沉积相平面分布特征和纵向演化分析为基础,进一步揭示出该盆地卡洛夫—牛津阶经历了台地前缘缓斜坡、台地边缘礁滩、开阔台地、局限台地、蒸发台地等交替发育构成多期次海进—海退旋回演化和"开放性宽缓型镶边缓斜坡台地"沉积模式。

The sedimentary facies of Callovian-Oxfordian Stage in Amu Darya basin, Turkmenistan

Based on core observations,identification of thin sections and paleontology,in combination with logging facies,seismic faces and regional depositional background,the authors have reached the conclusion that Callovian-Oxfordian carbonates in Amu Darya basin of Turkmenistan are carbonate platform deposits.Six types of sedimentary facies can be recognized,i.e.,evaporative platform,restricted platform,open platform,platformedge reef-shoal,platform fore-edge slope and platform basin facies.According to the facies correlation sections of the wells as well as the plane distribution and vertical evolution of sedimentary facies,the authors revealed the evolution characteristics of Callovian-Oxfordian sedimentary facies.The sedimentary environment changed from platform edge ramp,platform-edge reef-shoal,open platform and restricted platform into evaporative platform in turn,which constituted the multi-phase transgressive-regressive cycles.Finally,the depositional model of "platform with open,rimmed and gently dipping slope" has been established.