| Characteristics of Abnormal Pressure Systems and Their Responses of Fluid in Huatugou Oil Field, Qaidam Basin |
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| 作者姓名： | CHEN Xiaozhi XU Hao TANG Dazhen ZHANG Junfeng HU Xiaolan TAO Shu and CAI Yidong |
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| 作者单位： | 1 School of Energy Resources, China University of Geosciences, Beijing 100083, China; 2 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China; 3 P |
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| 基金项目： | This research was financially supported by the National Natural Science Foundation of China (No. 40802027) and the PetroChina Innovation Fund (No. 0706d01040102). |
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| 摘 要： | Abstract: 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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| 关 键 词： | Key words: abnormal pressure system low-pressure compartment fluid characteristics Huatugou oil field Qaidam basin |
| 收稿时间： | 2009/7/22 0:00:00 |
| 修稿时间： | 8/9/2009 12:00:00 AM |
Characteristics of Abnormal Pressure Systems and Their Responses of Fluid in Huatugou Oil Field,Qaidam Basin |
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| Authors: | CHEN Xiaozhi XU Hao TANG Dazhen CAI Yidong School of Energy Resources China University of Geosciences Beijing China Key Laboratory of Marine Reservoir Evolution Hydrocarbon Accumulation Mechanism Ministry of Education China PetroChina Exploration Production Company Beijing China |
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| Institution: | [1]School of Energy Resources, China University of Geosciences, Beijing 100083, China [2]Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry ofEducation, China University of Geosciences, Beijing 100083, China [3]PetroChina Exploration and Production Company, Beijing 100724, China |
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| Abstract: | 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 migr... |
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| Keywords: | abnormal pressure system low-pressure compartment fluid characteristics Huatugou oil field Qaidam basin |
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