储层天然裂缝形成机制的初步研究——以静北潜山油藏为例

A PRELIMINARY STUDY ON THE FORMATION MECHANISMS OF NATURAL FRACTURES IN RESERVOIRS:AN EXAMPLE FROM JINGBEI BURIED-HILL POOL, NORTH OF CENTRAL LIAONING PROVINCE

单业华 葛维萍

SHAN Ye-hua GE Wei-ping

青岛海洋大学海洋地质系, 山东, 青岛, 266003 2. 辽河石油管理局沈阳采油厂, 辽宁, 新民, 110316

Department of Marine Geology, Ocean University of Qingdao, Qingdao, Shandong 266003, China 2. Shenyang Oil Production Factory, Liaohe Petroleum Administration Bureau, Xinmin, Liaoning 110316, China

储层天然裂缝形成机制多种多样,不同机制产生的裂缝分布不尽相同.经常遇到的情形是裂缝总体由同期或不同期的多种机制形成.文中提出评价裂缝形成机制的一种新思路:由地质分析提出各种可能的主导裂缝形成机制,建立一级近似预测初期产量的线型裂缝分布模型,然后根据有关的生产数据求解上述模型,获得评价各种机制的信息.静北潜山裂缝性油藏的应用表明,卸荷和断层活动是该油藏储层裂缝的两种重要形成机制,所形成的裂缝在涉及范围内表现出相对的均匀分布,裂缝密集、遍布和不规则的特征直接与多期次和多方向的强烈断层作用有关.

There are a variety of formation mechanisms for the natural fractures in reservoirs.The fracture distributions produced by different mechanisms are not the same.It is usual that fractures on the whole are formed by many kinds of mechanisms in the same period or in different periods.In this paper,a new train of thought is suggested about evaluation on the formation mechanisms of fractures.Based on geological analyses,various possible formation mechanisms of dominant fractures are put forward,and a ling-typed fracture distribution model to predict initial production first-order approximately is established.Then,the sdution of the model is found according to related production data,and the information used in the evaluation of each mechanism is obaained.The application in Jingbei buried-hill fracture pool reveals that unloading and fault activities are two major formation mechanisms of reservoir fractures in this pool,the formed fractures show relatively even distribution in related range and close,wide and irregular features of fractures are directly related to the strong faulting of mang stages and directions.

山东省自然科学基金(Y98E08078)

https://doi.org/10.11781/sysydz200104457