Depositional and Diagenetic Controls on Reservoir Quality of Callovian-Oxfordian Stage on the Right Bank of Amu Darya

Yuzhong Xing, Hongjun Wang, Liangjie Zhang, Muwei Cheng, Haidong Shi, Chunqiu Guo, Pengyu Chen and Wei Yu ()
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Yuzhong Xing: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Hongjun Wang: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Liangjie Zhang: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Muwei Cheng: International Corporation (Turkmenistan), CNPC, Beijing 100080, China
Haidong Shi: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Chunqiu Guo: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Pengyu Chen: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Wei Yu: SimTech LLC, Katy, TX 77494, USA

Energies, 2022, vol. 15, issue 19, 1-20

Abstract: Based on the detailed analysis of sedimentology, diagenesis, and petrophysics, this study characterized the Middle-Lower Jurassic Callovian-Oxfordian carbonate reservoirs of 68 key wells in the Amu Darya Basin and assessed the controlling factors on the quality of the target intervals. We identified 15 types of sedimentary facies developed in seven sedimentary environments using sedimentary facies analysis, such as evaporative platform, restricted platform, open platform, platform margin, platform fore-edge upslope, platform fore-edge downslope, and basin facies. The target intervals went through multiple diagenetic stages, including the syndiagenetic stage, early diagenetic stage, and middle diagenetic stage, all of which had a significant impact on the reservoir quality. Main diagenetic processes include dissolution and fracturing which improve the reservoir quality as well as cementation, compaction, and pressure solution that reduce the reservoir quality. By analyzing the reservoir quality, we identified nine fluid flow units and five types of reservoir facies. Among them, the dissolved grain-dominated reservoir facies is of the highest quality and is the best storage and flow body, while the microporous mud-dominated reservoir facies of platform fore-edge downslope and open marine facies is of the lowest quality and could not become the flow unit unless it was developed by fracturing.

Keywords: carbonate reservoir; reservoir quality; depositional model; diagenetic process; flow unit; Callovian-Oxfordian Stage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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