Characteristics of Abnormal Pressure Systems and Their Responses of Fluid in Hua

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Characteristics of Abnormal Pressure Systems and Their Responses of Fluid in Huatugou Oil Field, Qaidam Basin

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 (N_2~1) and the Shangganchaigou Formation (N_1) 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 N_1 and N_2~1 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, prodeita 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 CaCl_2 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.水利论文]/k4I s6M'V7M/k+|?

作 者: CHEN Xiaozhi XU Hao TANG Dazhen ZHANG Junfeng HU Xiaolan TAO Shu CAI Yidong  
作者单位:CHEN Xiaozhi,XU Hao,TANG Dazhen,HU Xiaolan,TAO Shu,CAI Yidong(School of Energy Resources, China University ofGeosciences, Beijing 100083, China;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China)水利论文n+o7s!X.y.d {#vh
ZHANG Junfeng(PetroChina Exploration and Production Company, Beijing 100724, China) 
刊 名:地质学报(英文版)  SCI
英文刊名:ACTA GEOLOGICA SINICA 
年,卷(期):2009 83(5) 
分类号:P5 
关键词:abnormal pressure system   low-pressure compartment   fluid characteristics   Huatugou oil field   Qaidam basin  
机标关键词:Oil Fieldpressure coefficientformation pressureoil and gas accumulationhydrocarbon accumulationoil fieldgeothermal anomalyabnormal pressureformation watershallow lakeQaidam Basinenergycore samplescorrelationstudybelong toanalyzingsalinitytestingresults 
基金项目:国家自然科学基金,the PetroChina Innovation Fund 
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