镇泾油田长8油层组特低渗岩性油藏成藏机制研究

Accumulation mechanism of lithologic reservoir with ultra-low permeability in Chang8 oil formation, Zhenjing Oil Field

侯瑞云 柳林旺

Hou Ruiyun Liu Linwang

中国石油化工股份有限公司 华北分公司, 郑州 450006 2. 中国石油化工股份有限公司 华北分公司 勘探开发研究院, 郑州 450006

North China Branch Company, SINOPEC, Zhengzhou, He'nan 450006, China 2. Research Institute of Petroleum Exploration & Production, North China Branch Company, SINOPEC, Zhengzhou, He'nan 450006, China

镇泾油田长8油层具低孔特低渗特征.在储层沉积、成岩作用和储集特征研究的基础上,通过岩性圈闭形成条件、成藏动力、储层流体充注临界物性、圈闭形成和油气充注时间以及高产富集控制因素等方面对镇泾长8特低渗岩性油藏的形成机制开展了研究,得出了以下主要结论:①镇泾油田长8油层组具备形成大中型岩性油藏的有利条件;②储层沉积微相是岩性油藏形成的基本控制因素;③"三元成藏"(流体充注动力、储层临界物性和成藏窗口)构成镇泾长8岩性油藏形成的主控因素;④油藏的富集高产主要受有利储集相带控制,并受到天然裂缝的影响.

The Chang8 oil formation in the Zhenjing Oil Field is characterized by low porosity and ultra-low permeability.Based on the studies of reservoir deposition,diagenesis effect and storage characteristics,the generation mechanism of lithologic reservoir with ultra-low permeability in the Chang8 oil formation has been studied from several aspects such as lithologic trapping condition,accumulation dyna-mics,threshold for fluid charging,time for trapping and petroleum charging as well as controlling factor for sweet point.Conclusions have been made as follows.1) The Chang8 oil formation is favorable for the generation of medium-large lithologic reservoir.2) Sedimentary microfacies is the basic controlling factor for the generation of lithologic reservoir.3) Three elements (fluid charging dynamics,threshold of reservoir physical property,and effective trap matching with hydrocarbon charging period) control the formation of Chang8 lithologic reservoir.4) Prolific reservoir is mainly controlled by reservoir sedimentary facies,and also influenced by natural fracture.

中国石油化工股份公司科技部项目(P08042)

https://doi.org/10.11781/sysydz201104378