Characteristics of Abnormal Pressure Systems and Their Responses of Fluid in Huatugou Oil Field, Qaidam Basin
Corresponding Author
Xiaozhi CHEN
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
*Corresponding author. E-mail: [email protected]Search for more papers by this authorHao XU
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorDazhen TANG
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorJunfeng ZHANG
PetroChina Exploration and Production Company, Beijing 100724, China
Search for more papers by this authorXiaolan HU
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorShu TAO
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorYidong CAI
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorCorresponding Author
Xiaozhi CHEN
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
*Corresponding author. E-mail: [email protected]Search for more papers by this authorHao XU
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorDazhen TANG
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorJunfeng ZHANG
PetroChina Exploration and Production Company, Beijing 100724, China
Search for more papers by this authorXiaolan HU
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorShu TAO
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorYidong CAI
School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China
Search for more papers by this authorAbstract:
Based on the comprehensive study of core samples, well testing data, and reservoir fluid properties, the construction and the distribution of the abnormal pressure systems of the Huatugou oil field in Qaidam Basin are discussed. The correlation between the pressure systems and hydrocarbon accumulation is addressed by analyzing the corresponding fluid characteristics. The results show that the Huatugou oil field as a whole has low formation pressure and low fluid energy; therefore, the hydrocarbons are hard to migrate, which facilitates the forming of primary reservoirs. The study reservoirs, located at the Xiayoushashan Formation (N21) and the Shangganchaigou Formation (N1) are relatively shallow and have medium porosity and low permeability. They are abnormal low-pressure reservoirs with an average formation pressure coefficient of 0.61 and 0.72 respectively. According to the pressure coefficient and geothermal anomaly, the N1 and N21 Formations belong to two independent temperature-pressure systems, and the former has slightly higher energy. The low-pressure compartments consist of a distal bar as the main body, prodelta mud as the top boundary, and shore and shallow lake mud or algal mound as the bottom boundary. They are vertically overlapped and horizontally paralleled. The formation water is abundant in the Cl− ion and can be categorized as CaCl2 type with high salinity, which indicates that the abnormal low-pressure compartments are in good sealing condition and beneficial for oil and gas accumulation and preservation.
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