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Geoscience ›› 2018, Vol. 32 ›› Issue (05): 924-937.DOI: 10.19657/j.geoscience.1000-8527.2018.05.06

• Petroleum Geology • Previous Articles     Next Articles

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 Chongyang1,2(), YU Bingsong1(), WANG Hongjun2, RUAN Zhuang1, CHENG Chuanjie1, GUO Tongcui2, ZHANG Liangjie2, CHENG Muwei2   

  1. 1. School of Earth Science and Resources, China University of Geosciences, Beijing 100083,China
    2. PetroChina Research Institute of Exploration & Development,Beijing 100083, China
  • Received:2017-10-05 Revised:2018-02-10 Online:2018-10-10 Published:2018-11-04

Abstract:

The Amu Darya Basin in Turkmenistan is a large petroliferous sedimentary basin, yet its Callovian-Oxfordian 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 3rd order sequences and 15 4th order 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.

Key words: Amu Darya Basin, Callovian-Oxfordian, stratigraphic division, carbonate platform, sequence stratigraphic model

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