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准噶尔盆地西北缘油藏稠化类型划分及稠化模式研究

发表时间:2018-09-30  浏览量:117  下载量:33
全部作者: 高飞
作者单位: 中国石油新疆油田分公司风城油田作业区
摘 要: 通过对准噶尔盆地西北缘地区稠油地球化学特征及油层水的温度、pH值、矿化度等反映微生物发育环境的因素的对比分析,结合色层效应对原油稠化的影响,将西北缘地区原油稠化类型划分为四种类型,即大气水淋滤稠化、淡化氧化稠化、厌氧降解稠化、深部色层稠化。在此基础上,总结出构造特征、盖层发育程度和大气水渗入是西北缘地区原油稠变的主控因素。对西北缘地区原油稠化模式进行分析,总结出地质色层效应、成藏后次生蚀变这两种稠化模式,其中地质色层效应稠化模式主要由于油气远距离的运移,成藏环境发生巨大变化,原油组分中气体或轻质组分运移阻力较小,优先运移至更远的区域,而重烃组分易在储层相对致密处形成岩性稠油油藏,如八区和七区的稠油油藏,以及斜坡过渡到前缘地带。成藏后次生蚀变稠化由于后期保存条件差或遭受破坏,导致轻组分散失、遭受生物降解或氧化作用,如乌夏地区断裂带上盘稠油藏以及山前断裂区的大部分地区。
关 键 词: 地质学;准噶尔盆地;西北缘;稠化类型;地质色层效应;次生蚀变
Title: Classification of thickened types and thickening modes of reservoirs in the northwestern margin of Junggar basin
Author: GAO Fei
Organization: Oil Production Plant in Fengcheng Oilfield of Xinjiang Oilfield Company of PetroChina
Abstract: Through a comparative analysis of the factors that reflect the developmental environment of microorganisms of heavy oil in the northwestern margin of Junggar basin, the geochemical characteristics, temperature, pH, salinity, etc. of reservoir water, combining the influence of chromatographic effects on the thickening of crude oil, the crude oil thickening types in the northwestern margin are divided into four types: atmospheric water leaching, desalination and oxidation thickening, anaerobic degradation and thickening, and deep chromatographic thickening. Based on this, it is concluded that structural characteristics, caprock development and atmospheric water infiltration are the main controlling factors for crude oil thickening in the northwestern margin. The thickening modes of crude oil in the northwestern margin are analyzed. Two thickening modes, namely, thickening of geological layer effects and secondary alteration thickening of reservoirs after accumulation, are proposed. In which the thickening of geological layer effects, due to the long-range migration of oil and gas, the environment for hydrocarbon accumulation has undergone tremendous changes. The migration resistance of gas or light components in crude oil components is small, and they are preferentially moved to further areas, the heavy hydrocarbon components tend to form lithological heavy oil reservoirs in relatively dense reservoirs, such as the blocks 8 and 7, the transition to the front edge from the slope, and so on. In addition, the secondary alteration thickening of reservoirs after accumulation is caused by poor preservation or destruction of the later stage, resulting in loss of the light group, biodegradation or oxidation, for example, heavy oil reservoir on the fault zone in Wuxia area and most areas in the piedmont fault zone.
Key words: geology; Junggar basin; the northwestern margin; thickening type; geological layer effect; secondary alterations
发表期数: 2018年9月第18期
引用格式: 高飞. 准噶尔盆地西北缘油藏稠化类型划分及稠化模式研究[J]. 中国科技论文在线精品论文,2018,11(18):1864-1873.
 
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