Fault-karst carbonate reservoir prediction: a case study in Ordovician buried hills,HLHT Oilfield
Chang Shaoying1, Zhuang Xijin1, Deng xingliang2, Yang Xingjun3, and Zhao Zhaoyang4
1. Hangzhou Research Institute of Geology, PetroChina, Hangzhou, Zhejiang 310023, China; 2. Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China; 3. Institute of Exploration and Development, Liaohe Oilfield Company, PetroChina, Panjing, Liaoning 124000, China; 4. School of Geosciences, China University of Petroleum (Beijing), Beijing, 102249, China
Abstract：Oil production of wells in carbonate reservoirs is usually unstable,for this kind of reservoir the prediction success rate is rather low.Based on new understanding of fault-karst reservoir formation mechanism,we sums up six types of geological interpretation models for this reservoir.With the GeoEast software platform,we conduct a comprehensive study on fault-karst reservoir.Quite a few interpretation tools are used,such as high-precision fracture identification,buried hill trend prediction,fault evaluation,and fault-karst body classification.Fault-controlled reservoir locations,the difference of hydrocarbon potential,the pathway between caves are clarified.Fault-karst reservoir depicted and characterized.Reservoir scales and fault-karst belts are evaluated,which provided a good basis for the future exploration deployment.In the exploration and development of the HLHT Oilfield,the drilling success rate is increased based on our drill well proposal.
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