Formation condition of deep gas reservoirs in tight sandstones in Kuqa Foreland Basin
作者机构：PetroChina Research Institute of Petroleum Exploration and DevelopmentBeijing 100083China CNPC Key Laboratory of Basin Structure and Hydrocarbon AccumulationBeijing 100083China School of GeosciencesChina University of PetroleumShandong 266580China
出 版 物：《Petroleum Research》 (石油研究（英文）)
年 卷 期：2018年第3卷第4期
页 面：346-358页
核心收录：
学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程]
基 金：The work was supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2016ZX05003-002) the Scientific Research and Technology Development Project of PetroChina(No.2016B-0502)
主 题：Deep gas reservoir Tight sandstone Overpressure Fracture “Early-oil and late-gas”accumulation process Preservation condition Kuqa foreland basin
摘 要：Due to the high expense of deep oil and gas exploration,prediction of gas-bearing properties before drilling is crucial for deep gas reservoir of tight *** tight sandstone gas fields in Kuqa Foreland Basin are characterized by high abundance,high gas saturation,high pressure,high and stable yield,which belong to high-efficiency tight gas *** on theoretical analysis of controlling factors and mechanisms of gas-bearing properties for tight sandstone gas reservoir,and taking tight sandstone gas fields with high effectiveness such as Dibei,Keshen and Dibei gas fields in Kuqa Foreland Basin as examples,formation condition and mechanism of high-efficiency tight sandstone gas reservoir in Kuqa area are studied through a comparative analysis of typical tight sandstone gas reservoir in Sichuan Basin and Ordos *** results show that the formation condition of deep gas reservoir of tight sandstone in Kuqa foreland basin includes four factors:i.e.,overpressure gas charging,fracture development,“early-oil and late-gasaccumulation process and favorable preservation *** overpressure gas charging and fracture development are the most important factors for formation of high-efficiency tight gas reservoirs in Kuqa Foreland ***-quality source rocks,high sourcereservoir pressure difference,and overpressure filling induced thereby are preconditions for formation of tight sandstone with high gas *** fracture development controls gas migration,accumulation,and high yield of tight sandstone gas *** reservoir wettability changed by the early oil charging is beneficial to late natural gas charging,and the preservation condition of high-quality gypsum cap rocks is the key factor for gas reservoirs to maintain overpressure and high gas *** of above four favorable factors leads to the tight sandstone gas reservoir with high abundance,high gas saturation and high gas production in Kuqa Foreland Basin,which is very
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