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川东巫山坎地区嘉陵江组二段沉积相研究
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Abstract:
以钻井岩芯描述、镜下薄片鉴定为基础，通过测井、地震和区域构造–沉积等方面，对川东巫山坎地区嘉陵江组二段沉积相特征进行讨论，认为该地区嘉陵江组二段属于碳酸盐台地沉积体系，发育蒸发台地、局限台地2种沉积相类型。通过进行连井剖面对比，沉积相平面、纵向演化分析，认为该地区嘉陵江组一段和二段经历了局限台地和蒸发台地交替发育过程，形成了快速海进–缓慢海退的咸化旋回演化特征，在此基础上建立了适合研究区的碳酸盐沉积模式。
Based on core observations, identification of thin sections, in combination with logging facies, seismic faces and regional depositional background, the sedimentary facies characteristics of the member 2 of Jialingjiang Formation in Wushankan area, east of Sichuan basin are discussed. The authors have reached the conclusion that the member 2 of Jialingjiang Formation in East of Sichuan basin are carbonate platform deposits. Two types of sedimentary facies can be recognized, i.e., evaporative platform, restricted platform. 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 the member 2 and 1 of Jialingjiang Formation sedimentary facies. The sedimentary environment changed from restricted platform into evaporative platform in turn, which constituted the multi-phase transgressive-regressive cycles. Finally, the depositional model which is suitable for the study area has been established.
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