Buried hill karst reservoirs and their controls on productivity

Citation

Material Information

Title:
Buried hill karst reservoirs and their controls on productivity
Series Title:
Petroleum Exploration and Development
Creator:
Wang, Jincai
Zhao, Lun
Zhang, Xiangzhong
Yang, Zhigang
Cao, Haili
Chen, Li
Shan, Fachao
Liu, Minghui
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Ancient Buried Hill ( local )
Karst Reservoir ( local )
Reservoir Characteristics ( local )
Reservoir Concept Model ( local )
Productivity Characteristics ( local )
South Turgay Basin ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The concept model of ancient buried hill karst reservoirs was built taking the NWKK carbonate rock oilfield in the South Turgay Basin in Kazakhstan as an example, and the characteristics of karst reservoirs and their controls on productivity were analyzed in vertical and horizontal directions. Vertically, the karst reservoirs can be subdivided into, from top to bottom, weathering crust zone, epikarst zone, caves zone, vadose zone and phreatic zone, in which the development of fractures is strengthened gradually; Six reservoir types, breccia pore, cave, vug, fracture-vug, fracture-pore and pore, were developed; Each karst zone has high oil production and low water cut in the initial stage because of the developed fractures and karst caves, but the production declines rapidly and the water cut rises fast. Horizontally, the karst reservoir characteristics are controlled by structure altitude and ancient lithofacies: the ancient buried hill with high structure altitude and loose lithology suffers from stronger weathering and leaching, has much more solution caves and holes, the main reservoir types are breccia pore, cave, and vug, while the ancient buried hill with low structure altitude and compacted lithology has highly developed fractures and stronger communication with bottom water, the main reservoir types are fracture-vug and fracture-pore, and the reservoirs have better productivity effect but rapid production declines and water cut rising. Different areas in plane should adopt different development techniques and policies.
Original Version:
Petroleum Exploration and Development, Vol. 42, no. 6 (2015-12).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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