玛湖凹陷玛湖1井区泡点压力变化规律  

Variations of oil bubble point pressure in Mahu 1 well block of Mahu Depression

作　　者：韩宝[1] 骆飞飞[1] 王志维[1] 李丹杨 景文龙 程玉龙 李爱芬[2] HAN Bao;LUO Feifei;WANG Zhiwei;LI Danyang;JING Wenlong;CHENG Yulong;LI Aifen(Exploration and Development Research Institute,PetroChina Xinjiang Oilfield Company,Karamay 834000,China;School of Petroleum Engineering in China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《中国石油大学学报（自然科学版）》2023年第2期108-114,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油科技重大专项(ZD2019-183-008)。

摘　　要：玛湖1区块是位于玛湖凹陷南斜坡带的岩性砂砾岩未饱和油藏,泡点压力随深度变化无规律,无法用现有理论解释,影响了油藏的正常设计及开发。通过分析玛湖凹陷构造运动及油藏成因,分析玛湖1井区泡点压力随深度变化无规律的根本原因;测试常规油藏(储层中各处油气性质相同)泡点压力随深度的变化,提出玛湖1井区泡点压力随深度变化无规律是由于轻质油气二次成藏及油藏的非均质性造成的;提出确定泡点压力的运移阻力法。结果表明:玛湖凹陷有两次时间间隔较大的成藏时期,且第二次成藏时油品的性质优于第一次;玛湖1井区饱和压力、气油比随平均油气运移阻力的增加呈幂函数关系减小。Mahu 1 block is a lithologic and glutenite unsaturated oil reservoir located in the south slope zone of Mahu Depression.The relationship of its oil bubble point pressure with depth has poor regularity,which cannot be explained using the conventional models and has a great effect on the project design and development of the reservoir.In this study,the causes of the bubble pressure irregularity were investigated by analyzing the tectonic movement and the process of crude oil accumulation in Mahu Depression.The variation of bubble point pressure with depth in conventional oil reservoirs(in which oil and gas properties are assumed to be the same everywhere in the reservoir)was tested by PVT experiments,and it is proposed that a secondary accumulation of light oil and the heterogeneity of the reservoir are the main causes of the irregular change of bubble point pressure with depth.A method for determining the bubble pressure in Mahu 1 block was proposed based on oil and gas migration resistance.The results show that there were two petroleum accumulation periods with large time interval in the formation of Mahu 1 block,and the oil quality in the second accumulation period was much better than that in the first period.The saturation pressure and gas-oil ratio in Mahu 1 block decrease with the increase of average oil and gas migration resistance in a power function relationship.

关 键 词：玛湖油藏 玛湖1井区 泡点压力 溶解气油比 构造运动 运移阻力 

分 类 号：TE311[石油与天然气工程—油气田开发工程]