Lower permian reef-bank bodies' characterization in the pre-caspian basin

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Wang, Zhen^1 ; Wang, Yankun^1 ; Yin, Jiquan^1 ; Luo, Man^1 ; Liang, Shuang^1

Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China^1

关键词: Carbonate platforms;    Development phasis;    Lateral distributions;    Marine carbonate rock;    Sedimentary facies;    Seismic inversion techniques;    Subsalt exploration;    Vertical direction;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/3/032020/pdf
DOI  :  10.1088/1755-1315/121/3/032020

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Reef-bank reservoir is one of the targets for exploration of marine carbonate rocks in the Pre-Caspian Basin. Within this basin, the reef-bank bodies were primarily developed in the subsalt Devonian-Lower Permian formations, and are dominated by carbonate platform interior and margin reef-banks. The Lower Permian reef-bank present in the eastern part of the basin is considered prospective. This article provides a sequence and sedimentary facies study utilizing drilling and other data, as well as an analysis and identification of the Lower Permian reef-bank features along the eastern margin of the Pre-Caspian Basin using sub-volume coherence and seismic inversion techniques. The results indicate that the sub-volume coherence technique gives a better reflection of lateral distribution of reefs, and the seismic inversion impedance enables the identification of reef bodies' development phases in the vertical direction, since AI (impedance) is petrophysically considered a tool for distinguishing the reef limestone and the clastic rocks within the formation (limestone exhibits a relatively high impedance than clastic rock). With this method, the existence of multiple phases of the Lower Permian reef-bank bodies along the eastern margin of the Pre-Caspian Basin has been confirmed. These reef-bank bodies are considered good subsalt exploration targets due to their lateral connectivity from south to north, large distribution range and large scale.