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《Geoscience》 2018-05
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High-resolution Stratigraphic Division and Formation Model of the Callovian-Oxfordian Sequences in the Central Part of Block B in the Right Bank of Amu Darya Basin,Turkmenistan

WU Chongyang;YU Bingsong;WANG Hongjun;RUAN Zhuang;CHENG Chuanjie;GUO Tongcui;ZHANG Liangjie;CHENG Muwei;School of Earth Science and Resources,China University of Geosciences;PetroChina Research Institute of Exploration & Development;  
The Amu Darya Basin in Turkmenistan is a large petroliferous sedimentary basin,yet its CallovianOxfordian stratigraphic division and correlation are still disputed. We analyzed the Callovian-Oxfordian sequences in Block B of the Amu Darya right bank area( based on Vail's classic sequence stratigraphy and relevant sedimentology theories),integrating drill core,logging,seismic,thin section petrographic,and geochemical data. We found that the Callovian-Oxfordian sequences can be divided into five 3 rdorder sequences and 154 thorder sequences. Stratigraphy framework for the study area is newly established based on these high-resolution sequence divisions. Two carbonate platform models were developed:( i) Callovian,the region was likely a ramp platform with topographic highs in the west and lows in the east,and a gradual slope gradient with spatially consistent sedimentation rate;( ii) Oxfordian,the region was likely evolved into a rimmed platform system,with highly disparate sedimentation rates( low in the east) that were sensitive to sea level change,and a starkly different sedimentary landform that was high in the west and low in the east.
【Fund】: 国家科技重大专项“海外重点探区目标评价与未来领域选区选带研究”(2016ZX05029005);国家科技重大专项“土库曼斯坦阿姆河右岸裂缝孔隙(洞)型碳酸盐岩气藏高效开发关键技术研究与应用”(2017ZX05030-003)
【CateGory Index】: P539.2
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